Skin+ Refill
90 Vegan capsules per bottle
Hair
Skin
Nails
Cell Maintenance
- 30-day supply with refills delivered monthly.
- Pause or cancel anytime.
We stand by our science — enjoy 90 days risk-free. Read more
3 capsules typically provides:
Per Portion - *NRV
- Vitamin A - 800µg RE (100% NRV)
- Vitamin C (from ascorbic acid and collagen formation blend*) - 80mg (100% NRV)
- Riboflavin - 1.4mg (100% NRV)
- Niacin - 16mg NE (100% NRV)
- Biotin - 50µg (100% NRV)
- Zinc - 10mg (100% NRV)
- Copper - 1mg (100% NRV)
- Selenium - 55µg (100% NRV)
- Iodine - 150µg (100% NRV)
- from Seaweed - 189mg - Hyaluronic Acid - 150mg
- Vegan Collagen Formation Blend - 120mg,
Providing:
- L-Glycine - 30mg
- L-Proline - 19mg
- L-Hydroxyproline - 18mg
- L-Glutamic Acid - 16mg
- L-Arginine - 10mg
- L-Alanine - 10mg
- Vitamin C - Horsetail extract - 200mg
- Providing silica - 14mg - Coconut Water - 50mg
- Avocado - 50mg
- Cucumber - 50mg
- Kale - 50mg
- Lemon - 50mg
- Inositol - 200mg
*NRV=Nutrient Reference Value
Ingredients
Ingredients:
HydroxyPropyl MethylCellulose, Horsetail Stem Extract, Myo Inositol, Vegan Hyaluronic Acid, Bulking Agent: Rice Bran, Collagen Formation Blend: (L-Glycine, L-Proline, L-Hydroxyproline, L-Glutamic Acid, L-Arginine, L-Alanine, Vitamin C as Ascorbic Acid, Anti-Caking Agent: Silicon Dioxide), Coconut Water Powder, Vitamin C as Ascorbic Acid, Lemon Powder, Cucumber Powder, Avocado Powder, Kale Leaf Powder, Zinc Glycinate (Rice), Maltodextrin, Niacin as Nicotinamide, Seaweed Ascophyllum nodosum as PureSea®, Anti-Caking Agent: Magnesium Stearate, Selenium Prep (Microcrystalline Cellulose, Selenomethionine), Vitamin A Prep (Gum Arabic, Maltodextrin, Sucrose, Retinol Acetate, Vegetable Oil, Tocopherols, Sodium Ascorbate, Silicon Dioxide), Copper Gluconate, Riboflavin, D-Biotin.
Allergens
Allergens:
Although rigorous precautions are taken to prevent any cross-contamination, this product is manufactured in a facility that handles allergy-based materials.
Disclaimer
Disclaimer:
Always consult your health practitioner before taking nutritional supplements, especially if you are taking medication or are under medical supervision. Not recommended for children, pregnant or lactating women. You should not take supplements as a substitute for a varied balanced diet or healthy lifestyle. Store in a cool dry place, out of reach of children.
Adults, take 3 capsules daily with water and food.
Do not exceed recommended daily dose.
To get the most out of your hair, skin & nails supplement, we recommend taking 3 capsules per day with water and a meal—morning or midday tends to work best for most.
Taking it with food helps your body absorb the nutrients more effectively and reduces the risk of mild stomach discomfort.
This supplement is not suitable for children, or for women who are pregnant or breastfeeding. If you’re on medication or under medical supervision, always check with your healthcare provider first.
Delivery time begins after the carrier receives your package.
Skin+Refill
The Persona
Promise
Discover what makes us different and why our customers trust us.
At Persona we don't use marketing claims.
Every health benefit you see is approved by european authorities and backed by science.
It's how we build trust.
As we age, natural collagen declines, and daily life — sun, stress, and environment — can leave skin feeling tired and less supple. That’s why this formula pairs Vitamin C with a Vegan Collagen blend, Hyaluronic Acid, minerals and botanical plants like Horsetail extract that is naturally rich in silica for you hair and nails.
- Hyaluronic Acid is included as part of daily nutritional support.
- Biotin, Riboflavin and Niacin contribute to the maintenance of normal skin.*
- Biotin, Zinc and Selenium contribute to the maintenance of normal hair.*
- Biotin and Selenium contribute to the maintenance of normal nails.*
- Copper contributes to normal hair and skin pigmentation.*
Your joints, cartilage, and connective tissues form the framework that keeps you moving freely every day. We’ve combined Vitamin C with fermented amino acids — the same types found in collagen-rich tissues. This vegan-friendly blend provides your body with key nutrients without negative impact on our oceans and the marine environment.
- Vitamin C contributes to normal collagen formation for the normal function of bones, cartilage and blood vessels.*
- Vitamin C contributes to normal collagen formation for the normal function of skin.*
- Iodin contributes to the maintenance of normal skin.*
Environmental stress, lifestyle, and age can challenge our natural balance, which is why antioxidants and trace minerals are so important. This formula contains Vitamin E, Selenium, and PureSea® seaweed (a natural source of Iodine) to provide key nutrients.
- Vitamin E, C and Selenium contributes to the protection of cells from oxidative stress.*
- Iodine contributes to normal energy-yielding metabolism and to normal cognitive function.*
- Zinc contributes to the normal function of the immune system.*
Understanding Bioavailability
Why the form of a vitamin matters as much as the vitamin itself
The Restaurant Example
Imagine ordering salmon at a restaurant. The menu says "salmon", but what arrives could be perfectly grilled, raw, or still wrapped in plastic. Technically all salmon, but only one is actually nourishing.
Vitamins work the same way. A label might say "Vitamin C 1000 mg," but that vitamin could be in a form your body barely absorbs, or one it uses efficiently. The form determines whether your body can actually use what you're taking.
What Is Bioavailability?
Bioavailability is the amount of a nutrient that actually enters your bloodstream and reaches your cells.
If you take 100 mg of a vitamin but only 20 mg gets absorbed, the bioavailability is 20%. The rest passes through unused.
What affects bioavailability:
- The chemical form of the vitamin
- Your individual gut health and genetics
- What you eat alongside the supplement
Common Vitamin Forms Explained
Methylated Vitamins (Active Forms)
Some people struggle to convert standard vitamins into their active, usable forms due to genetic variations. Methylated vitamins skip that step; they're already active.
Example: Methylcobalamin (B12) vs Cyanocobalamin
- Methylcobalamin Active form, immediately usable
- Cyanocobalamin Synthetic, requires conversion (which 40-60% of people struggle with due to MTHFR gene variants)
Common forms: Methylfolate (5-MTHF), methylcobalamin (B12), P-5-P (B6)
Natural vs Synthetic
"Natural" doesn't automatically mean better; it depends on the specific vitamin.
Example: Vitamin E
- Natural (d-alpha-tocopherol): Derived from plants, more biologically active
- Synthetic (dl-alpha-tocopherol): Contains 8 forms, only one your body prefers
Example: Vitamin C
- Ascorbic acid (synthetic) is molecularly identical to natural vitamin C and equally effective
- Liposomal vitamin C: Wrapped in fat bubbles for enhanced absorption and higher blood levels
Fat-Soluble vs Water-Soluble
Fat-soluble vitamins (A, D, E, K) need fat to be absorbed. Taking them with food containing healthy fats significantly improves uptake.
Water-soluble vitamins (B, C) dissolve in water and are absorbed more easily, but excess is excreted quickly, making sustained-release forms sometimes beneficial.
What "Bioavailable" Actually Means on a Label
When we say "bioavailable form," we mean:
- Active forms that don't require conversion (methylated B vitamins)
- Forms with proven absorption backed by scientific research
- Enhanced delivery systems (like liposomal technology)
What it shouldn't mean: vague marketing language without specifics.
Red flags to watch for:
- No specific form listed (just "Vitamin B12" without the type)
- "Proprietary blends" that hide ingredient amounts
- Claims without any absorption data
The Bottom Line
A cheaper supplement with poor bioavailability isn't a bargain. The best supplements aren't about taking more; they're about absorbing what you take.
What to look for:
- Specific forms clearly listed on the label
- Science-backed forms (methylated, chelated, liposomal)
- Transparency about dosages and sources
At Persona, we choose forms based on scientific evidence for absorption, not what's cheapest to manufacture. Because if your body can't use it, what's the point?
References: EFSA scientific opinions on bioavailability; NIH Office of Dietary Supplements; peer-reviewed studies on vitamin absorption and forms (available upon request).
Nourish every layer
Vegan Collagen Blend
From 6 different fermented amino acids for optimal absorption
With PureSea® Seaweed
Sustainably harvested from Scotland, a natural source of iodine, with DNA-verified purity and traceability.
24 Active Nutrients
Vitamins, minerals, plant extracts and amino acids for complete support.
Complete Beauty Support
Clinically proven support for hair, skin, nail, joints and energy metabolism.*
More than just Supplements
Bioavailable Nutrients
How to Use:
- Take 3 capsules daily with water and food.
The Benefits of Hyaluronic Acid
High Absorption form
Hyaluronic acid (HA) is a naturally occurring molecule found throughout the body, with the highest concentrations in skin, eyes, and connective tissue. It has a remarkable ability to hold up to 1,000 times its weight in water, making it essential for skin hydration, joint lubrication, and tissue repair. Natural production declines with age, which contributes to visible signs of skin ageing.
Key Highlights
- Holds up to 1,000 times its weight in water
- Significantly improves skin hydration and elasticity (2025 clinical studies)
- May reduce wrinkle depth with consistent supplementation
- Supports joint lubrication and comfort
- Natural production declines ~50% by age 50
- Well-absorbed as oral sodium hyaluronate
Biochemistry Timeline
Oral HA supplementation typically shows measurable improvements in skin hydration within 6 to 8 weeks, with continued improvement up to 12 weeks. Joint-related benefits may take 8 to 12 weeks. Typical studied doses are 60-200 mg per day. HA is well-tolerated with an excellent safety profile.
Wound Healing
Hyaluronic acid plays a role in wound healing by regulating inflammation and supporting the formation of new blood vessels and tissue. HA levels increase at wound sites, helping to scaffold new tissue growth. This natural role in tissue repair extends to the skin's ability to recover from damage.
Gum and Oral Health
HA is found in gum tissue and plays a role in maintaining healthy oral tissues. Research has explored HA's use in supporting gum health and healing after dental procedures. Adequate HA levels support the integrity of the soft tissues in the mouth.
Summary
Hyaluronic acid is a naturally occurring molecule essential for skin hydration, joint lubrication, and tissue health. Oral supplementation with 60-200 mg per day has been shown to significantly improve skin hydration, elasticity, and brightness within 6 to 12 weeks. Natural HA production declines with age, making supplementation increasingly relevant from the 30s onwards.
FAQs
How much hyaluronic acid should I take?
Research has used 60-200 mg per day of sodium hyaluronate. Benefits are typically seen at 60 mg/day within 6-12 weeks.
Is oral HA as effective as topical?
They work differently. Topical HA hydrates the skin surface, while oral HA supports hydration from within at the dermal level. Together, they provide complementary benefits.
Are there any side effects?
Oral hyaluronic acid is generally very well-tolerated with an excellent safety profile. Side effects are rare.
Is HA safe during pregnancy?
HA is a naturally occurring substance in the body. Oral supplements are generally considered safe, but consult your healthcare provider during pregnancy.
Research
Amin et al. — J Drugs Dermatol (2025). [Meta-analysis (7 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/40911749/
Contipro — Scientific Reports (Nature) (2025). [RCT (double-blind, placebo-controlled)]. https://www.nature.com/articles/s41598-025-32758-5
Montero-Vilchez et al. — Dermatol Ther (Springer) (2025). [RCT (double-blind, placebo-controlled)]. https://pubmed.ncbi.nlm.nih.gov/40498387/
JDD — J Drugs Dermatol (2025). [Meta-analysis (7 RCTs)].
Contipro — Sci Rep (Nature) (2025). [RCT (placebo-controlled)]. https://www.nature.com/articles/s41598-025-32758-5
Montero-Vilchez et al. — Dermatol Ther (2025). [RCT (placebo-controlled)].
Zague V et al. – Journal of medicinal food (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40518844/
Dolečková I et al. – Scientific reports (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/41422283/
Atmeh BSK et al. – Oral surgery, oral medicine, oral pathology and oral radiology (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40645842/
Yang J et al. – Frontiers in immunology (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41246343/
Wang X et al. – International journal of pharmaceutics (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39799999/
Liu T et al. – Probiotics and antimicrobial proteins (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40643864/
Whittle SL et al. – The Cochrane database of systematic reviews (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40169165/
Marchand Lamiraud F et al. – Maturitas (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40273666/
Bensmail H et al. – Maturitas (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40773978/
Chęciński M et al. – International journal of molecular sciences (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39273351/
Cenzato N et al. – The British journal of oral & maxillofacial surgery (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/39317566/
Muhammad P et al. – Archives of dermatological research (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38829483/
Ranawat A et al. – Advances in therapy (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37899384/
Agrawal S et al. – Menopause (New York, N.Y.) (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/39042017/
Gao et al. — Skin Res Technol (2023). [RCT (double-blind)].
Guadagna et al. — J Med Food (2023). [Systematic review & MA (15 RCTs)]. General
Na GH et al. – Nutrients (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38201966/
Chen Y et al. – Military Medical Research (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37608335/
Yuan N et al. – International journal of biological macromolecules (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37019198/
Casiano Evans EA et al. – Obstetrics and gynecology (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37543737/
Gold D et al. – Maturitas (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36279690/
Hyrylev et al. — Nutrients (2022). [Systematic review (11 studies)]. General
Yang S et al. – Frontiers in endocrinology (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36213270/
Nappi RE et al. – Minerva obstetrics and gynecology (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/34096694/
Cagnacci A et al. – European journal of obstetrics, gynecology, and reproductive biology (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/35131532/
Michelotti A et al. – European journal of dermatology : EJD (2021). [RCT]. https://pubmed.ncbi.nlm.nih.gov/34933842/
Juncan AM et al. – Molecules (Basel, Switzerland) (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34361586/
Dixon D et al. – Drugs (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33382445/
Bosi A et al. – Cells (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/35011688/
Dos Santos CCM et al. – The journal of sexual medicine (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33293236/
Buzzaccarini G et al. – Climacteric : the journal of the International Menopause Society (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33759670/
Shah BM et al. – International journal of biological macromolecules (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33010274/
Kobayashi T et al. – Biomolecules (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33171800/
Graça MFP et al. – Carbohydrate polymers (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32507198/
Schwartz SR et al. – Alternative therapies in health and medicine (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31221944/
Gupta RC et al. – Frontiers in veterinary science (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31294035/
Sundaram H et al. – Journal of drugs in dermatology : JDD (2018). [RCT]. https://pubmed.ncbi.nlm.nih.gov/29601621/
Kaneko T et al. – Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29607994/
Oe M et al. - Journal of Medicinal Food (2017). [RCT]. https://pubmed.ncbi.nlm.nih.gov/27982756/
Oe et al. — Nutr J (2016). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/26795098/
Oe M et al. - Scientific World Journal (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26893578/
Richards MM et al. – The Physician and sportsmedicine (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/26985986/
Kawada et al. — J Clin Biochem Nutr (2015). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/25530102/
Kawada C et al. - Clinical, Cosmetic and Investigational Dermatology (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26170709/
Campbell KA et al. – Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association (2015). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26033459/
Campbell KA et al. – Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association (2015). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/25998016/
Gallagher B et al. – The American journal of sports medicine (2015). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/24866892/
Oe et al. — J Agric Food Chem (2014). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/25014997/
du Souich P – Pharmacology & therapeutics (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24457028/
Chen J et al. – The journal of sexual medicine (2013). [RCT]. https://pubmed.ncbi.nlm.nih.gov/23574713/
Tashiro T et al. - ScientificWorldJournal (2012). [RCT]. https://pubmed.ncbi.nlm.nih.gov/23326024/
Samson DJ et al. – Evidence report/technology assessment (2007). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/18088162/
Matheson AJ et al. – Drugs & aging (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/14651444/
Espallargues M et al. – International journal of technology assessment in health care (2003). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/12701938/
60 studies — Hyaluronic Acid
Amin et al. — J Drugs Dermatol (2025). [Meta-analysis (7 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/40911749/
Contipro — Scientific Reports (Nature) (2025). [RCT (double-blind, placebo-controlled)]. https://www.nature.com/articles/s41598-025-32758-5
Montero-Vilchez et al. — Dermatol Ther (Springer) (2025). [RCT (double-blind, placebo-controlled)]. https://pubmed.ncbi.nlm.nih.gov/40498387/
JDD — J Drugs Dermatol (2025). [Meta-analysis (7 RCTs)].
Contipro — Sci Rep (Nature) (2025). [RCT (placebo-controlled)]. https://www.nature.com/articles/s41598-025-32758-5
Montero-Vilchez et al. — Dermatol Ther (2025). [RCT (placebo-controlled)].
Zague V et al. – Journal of medicinal food (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40518844/
Dolečková I et al. – Scientific reports (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/41422283/
Atmeh BSK et al. – Oral surgery, oral medicine, oral pathology and oral radiology (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40645842/
Yang J et al. – Frontiers in immunology (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41246343/
Wang X et al. – International journal of pharmaceutics (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39799999/
Liu T et al. – Probiotics and antimicrobial proteins (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40643864/
Whittle SL et al. – The Cochrane database of systematic reviews (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40169165/
Marchand Lamiraud F et al. – Maturitas (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40273666/
Bensmail H et al. – Maturitas (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40773978/
Chęciński M et al. – International journal of molecular sciences (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39273351/
Cenzato N et al. – The British journal of oral & maxillofacial surgery (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/39317566/
Muhammad P et al. – Archives of dermatological research (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38829483/
Ranawat A et al. – Advances in therapy (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37899384/
Agrawal S et al. – Menopause (New York, N.Y.) (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/39042017/
Gao et al. — Skin Res Technol (2023). [RCT (double-blind)].
Guadagna et al. — J Med Food (2023). [Systematic review & MA (15 RCTs)]. General
Na GH et al. – Nutrients (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38201966/
Chen Y et al. – Military Medical Research (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37608335/
Yuan N et al. – International journal of biological macromolecules (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37019198/
Casiano Evans EA et al. – Obstetrics and gynecology (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37543737/
Gold D et al. – Maturitas (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36279690/
Hyrylev et al. — Nutrients (2022). [Systematic review (11 studies)]. General
Yang S et al. – Frontiers in endocrinology (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36213270/
Nappi RE et al. – Minerva obstetrics and gynecology (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/34096694/
Cagnacci A et al. – European journal of obstetrics, gynecology, and reproductive biology (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/35131532/
Michelotti A et al. – European journal of dermatology : EJD (2021). [RCT]. https://pubmed.ncbi.nlm.nih.gov/34933842/
Juncan AM et al. – Molecules (Basel, Switzerland) (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34361586/
Dixon D et al. – Drugs (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33382445/
Bosi A et al. – Cells (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/35011688/
Dos Santos CCM et al. – The journal of sexual medicine (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33293236/
Buzzaccarini G et al. – Climacteric : the journal of the International Menopause Society (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33759670/
Shah BM et al. – International journal of biological macromolecules (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33010274/
Kobayashi T et al. – Biomolecules (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33171800/
Graça MFP et al. – Carbohydrate polymers (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32507198/
Schwartz SR et al. – Alternative therapies in health and medicine (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31221944/
Gupta RC et al. – Frontiers in veterinary science (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31294035/
Sundaram H et al. – Journal of drugs in dermatology : JDD (2018). [RCT]. https://pubmed.ncbi.nlm.nih.gov/29601621/
Kaneko T et al. – Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29607994/
Oe M et al. - Journal of Medicinal Food (2017). [RCT]. https://pubmed.ncbi.nlm.nih.gov/27982756/
Oe et al. — Nutr J (2016). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/26795098/
Oe M et al. - Scientific World Journal (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26893578/
Richards MM et al. – The Physician and sportsmedicine (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/26985986/
Kawada et al. — J Clin Biochem Nutr (2015). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/25530102/
Kawada C et al. - Clinical, Cosmetic and Investigational Dermatology (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26170709/
Campbell KA et al. – Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association (2015). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26033459/
Campbell KA et al. – Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association (2015). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/25998016/
Gallagher B et al. – The American journal of sports medicine (2015). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/24866892/
Oe et al. — J Agric Food Chem (2014). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/25014997/
du Souich P – Pharmacology & therapeutics (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24457028/
Chen J et al. – The journal of sexual medicine (2013). [RCT]. https://pubmed.ncbi.nlm.nih.gov/23574713/
Tashiro T et al. - ScientificWorldJournal (2012). [RCT]. https://pubmed.ncbi.nlm.nih.gov/23326024/
Samson DJ et al. – Evidence report/technology assessment (2007). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/18088162/
Matheson AJ et al. – Drugs & aging (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/14651444/
Espallargues M et al. – International journal of technology assessment in health care (2003). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/12701938/
The Benefits of Vitamin A
Active form
Vitamin A is a fat-soluble vitamin essential for vision, immune function, skin health, and cell differentiation. It exists in two forms: preformed vitamin A (retinol, found in animal products) and provitamin A (beta-carotene, found in colourful fruits and vegetables). Adequate vitamin A supports the body's natural defence systems and the maintenance of healthy skin and mucous membranes.
Key Highlights
- Contributes to the maintenance of normal vision (EFSA approved)
- Supports normal function of the immune system (EFSA approved)
- Contributes to the maintenance of normal skin (EFSA approved)
- Supports the maintenance of normal mucous membranes (EFSA approved)
- Has a role in the process of cell specialisation (EFSA approved)
- Contributes to normal iron metabolism (EFSA approved)
Biochemistry Timeline
Vitamin A is fat-soluble and stored in the liver, so the body maintains reserves. Correcting a deficiency typically takes 2 to 4 weeks with appropriate supplementation. Vision-related improvements (night vision) can occur relatively quickly once levels are restored.
Because vitamin A is stored in the body, there is a greater risk of excess compared to water-soluble vitamins. This is why balanced, moderate supplementation is important, and very high-dose vitamin A should only be taken under medical supervision.
Thyroid Support
Research has explored the relationship between vitamin A and thyroid function. A study by Farhangi et al. (2012, Journal of the American College of Nutrition) found that 25,000 IU of retinol daily for 4 months normalised TSH levels and increased free T3 in participants.
While this was a specific clinical intervention and not a general supplementation recommendation, it highlights vitamin A's role in supporting thyroid hormone metabolism. Ensuring adequate vitamin A intake may support normal thyroid function, particularly in combination with selenium and iodine.
Iron Metabolism
Vitamin A contributes to normal iron metabolism, an EFSA-approved health claim. It helps mobilise iron from storage and supports its incorporation into haemoglobin. This relationship means that vitamin A deficiency can worsen iron deficiency anaemia, even when iron intake is adequate.
For women of reproductive age, who are at higher risk of both vitamin A and iron insufficiency, ensuring adequate intake of both nutrients supports optimal red blood cell formation and energy levels.
Summary
Vitamin A is essential for vision, immune function, skin health, and cell differentiation. It exists as preformed retinol (from animal foods) and provitamin A beta-carotene (from colourful vegetables). EFSA recognises multiple health claims including contributions to normal vision, immune function, skin maintenance, and iron metabolism.
Balanced supplementation is key with vitamin A, as the body stores it in the liver and excess preformed retinol can be harmful. The European upper limit is 3,000 µg RAE per day. For most people, moderate supplementation alongside a varied diet provides optimal support.
FAQs
How much vitamin A do I need?
The recommended daily allowance for women aged 19+ is 700 µg RAE. The European upper limit for preformed retinol is 3,000 µg RAE per day. Beta-carotene from food has no established upper limit as the body self-regulates conversion.
Is vitamin A safe during pregnancy?
Adequate vitamin A is important during pregnancy for fetal development. However, excessive preformed retinol (above 3,000 µg RAE) during pregnancy has been associated with birth defects. Pregnant women should avoid high-dose vitamin A supplements and liver products, and follow their healthcare provider's guidance.
What is the difference between retinol and beta-carotene?
Retinol is preformed vitamin A (active, from animal sources) that the body uses directly. Beta-carotene is a provitamin (from plant sources) that the body converts to retinol as needed. Beta-carotene is safer at higher intakes because the body only converts what it needs.
Can I take too much vitamin A?
Yes, excessive intake of preformed retinol can cause liver toxicity, headaches, and other symptoms. Stay within recommended limits and avoid combining multiple supplements that contain vitamin A without checking total intake.
Are there any interactions with medications?
Vitamin A can interact with retinoid medications (used for skin conditions), some antibiotics, and blood-thinning drugs. Consult your healthcare provider if you take regular medication.
Research
Sianipar EA et al. – Drug design, development and therapy (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41710586/
NIH ODS — Vitamin A Health Professional Fact Sheet (2025). [Regulatory / Reference]. https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
Azhar M et al. – Neonatology (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39591949/
Santo ACSDE et al. – Nutrition (Burbank, Los Angeles County, Calif.) (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38696907/
Lau M et al. – Archives of dermatological research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38758222/
Chaudhary V et al. – Biological trace element research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38109004/
Kurokawa I et al. – Dermatology and therapy (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37338719/
Imdad A et al. - Cochrane Database of Systematic Reviews (2022). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/35266555/
Vlieg-Boerstra B et al. – Allergy (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34626488/
Miller LJ et al. – Clinical nutrition (Edinburgh, Scotland) (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36067585/
Imdad A et al. – The Cochrane database of systematic reviews (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35294044/
Szymański Ł et al. – Cells (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33322246/
Bastos Maia et al. — Nutrients (2019). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31405217/
Church JA et al. – The Lancet. Infectious diseases (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30712836/
Zinder R et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31697447/
Bohn T et al. – The Proceedings of the Nutrition Society (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30747092/
Huang et al. — J Am Acad Dermatol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29217280/
Huang Z et al. - Nutrients (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30400586/
Yakoob MY et al. – Journal of epidemiology and global health (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30859783/
Bello S et al. – The Cochrane database of systematic reviews (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27580345/
McCauley et al. — Cochrane Review (2015). [Cochrane systematic review].
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
EFSA Panel - EFSA Journal (2015). [Scientific Opinion]. Safety
Bello S et al. – The Cochrane database of systematic reviews (2014). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/24436005/
Bjelakovic et al. — PLOS ONE (Cochrane-based) (2013). [Meta-analysis / Meta-regression (53 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC3765487/
Gilbert — Surv Ophthalmol (2013). [Review]. General
Gilbert C - Community Eye Health (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/24782580/
Farhangi et al. — J Am Coll Nutr (2012). [RCT].
Rutkowski M et al. – International journal of occupational medicine and environmental health (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22528540/
Hovdenak N et al. – European journal of obstetrics, gynecology, and reproductive biology (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22771225/
Clagett-Dame & Knutson — Nutrients (2011). [Comprehensive review].
Clagett-Dame M & Knutson D - Critical Reviews in Food Science and Nutrition (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/21711128/
Mayo-Wilson E et al. – BMJ (Clinical research ed.) (2011). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21868478/
Bello S et al. – The Cochrane database of systematic reviews (2011). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21491401/
Sommer A - Journal of Nutrition (2008). [Landmark Review]. https://pubmed.ncbi.nlm.nih.gov/18203906/
Huiming Y et al. – The Cochrane database of systematic reviews (2005). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/16235283/
Genaro Pde S et al. – Nutrition reviews (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15080368/
Brown N et al. – Acta paediatrica (Oslo, Norway : 1992) (2004). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/15513568/
Solomons NW et al. – Asia Pacific journal of clinical nutrition (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/14506004/
D'Souza RM et al. – Journal of tropical pediatrics (2002). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12022432/
D'Souza RM et al. – Journal of tropical pediatrics (2002). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12521271/
West et al. — BMJ (Nepal NNIPS-2 trial) (1999). [Cluster RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/10037611/
Wiegand UW et al. – International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition (1998). [Review]. https://pubmed.ncbi.nlm.nih.gov/9857270/
Ward BJ – Drugs & aging (1996). [Review]. https://pubmed.ncbi.nlm.nih.gov/8818585/
van Dam MA – The Nurse practitioner (1989). [Review]. https://pubmed.ncbi.nlm.nih.gov/2671824/
45 studies — Vitamin A
Sianipar EA et al. – Drug design, development and therapy (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41710586/
NIH ODS — Vitamin A Health Professional Fact Sheet (2025). [Regulatory / Reference]. https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
Azhar M et al. – Neonatology (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39591949/
Santo ACSDE et al. – Nutrition (Burbank, Los Angeles County, Calif.) (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38696907/
Lau M et al. – Archives of dermatological research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38758222/
Chaudhary V et al. – Biological trace element research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38109004/
Kurokawa I et al. – Dermatology and therapy (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37338719/
Imdad A et al. - Cochrane Database of Systematic Reviews (2022). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/35266555/
Vlieg-Boerstra B et al. – Allergy (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34626488/
Miller LJ et al. – Clinical nutrition (Edinburgh, Scotland) (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36067585/
Imdad A et al. – The Cochrane database of systematic reviews (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35294044/
Szymański Ł et al. – Cells (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33322246/
Bastos Maia et al. — Nutrients (2019). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31405217/
Church JA et al. – The Lancet. Infectious diseases (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30712836/
Zinder R et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31697447/
Bohn T et al. – The Proceedings of the Nutrition Society (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30747092/
Huang et al. — J Am Acad Dermatol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29217280/
Huang Z et al. - Nutrients (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30400586/
Yakoob MY et al. – Journal of epidemiology and global health (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30859783/
Bello S et al. – The Cochrane database of systematic reviews (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27580345/
McCauley et al. — Cochrane Review (2015). [Cochrane systematic review].
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
EFSA Panel - EFSA Journal (2015). [Scientific Opinion]. Safety
Bello S et al. – The Cochrane database of systematic reviews (2014). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/24436005/
Bjelakovic et al. — PLOS ONE (Cochrane-based) (2013). [Meta-analysis / Meta-regression (53 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC3765487/
Gilbert — Surv Ophthalmol (2013). [Review]. General
Gilbert C - Community Eye Health (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/24782580/
Farhangi et al. — J Am Coll Nutr (2012). [RCT].
Rutkowski M et al. – International journal of occupational medicine and environmental health (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22528540/
Hovdenak N et al. – European journal of obstetrics, gynecology, and reproductive biology (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22771225/
Clagett-Dame & Knutson — Nutrients (2011). [Comprehensive review].
Clagett-Dame M & Knutson D - Critical Reviews in Food Science and Nutrition (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/21711128/
Mayo-Wilson E et al. – BMJ (Clinical research ed.) (2011). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21868478/
Bello S et al. – The Cochrane database of systematic reviews (2011). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21491401/
Sommer A - Journal of Nutrition (2008). [Landmark Review]. https://pubmed.ncbi.nlm.nih.gov/18203906/
Huiming Y et al. – The Cochrane database of systematic reviews (2005). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/16235283/
Genaro Pde S et al. – Nutrition reviews (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15080368/
Brown N et al. – Acta paediatrica (Oslo, Norway : 1992) (2004). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/15513568/
Solomons NW et al. – Asia Pacific journal of clinical nutrition (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/14506004/
D'Souza RM et al. – Journal of tropical pediatrics (2002). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12022432/
D'Souza RM et al. – Journal of tropical pediatrics (2002). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12521271/
West et al. — BMJ (Nepal NNIPS-2 trial) (1999). [Cluster RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/10037611/
Wiegand UW et al. – International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition (1998). [Review]. https://pubmed.ncbi.nlm.nih.gov/9857270/
Ward BJ – Drugs & aging (1996). [Review]. https://pubmed.ncbi.nlm.nih.gov/8818585/
van Dam MA – The Nurse practitioner (1989). [Review]. https://pubmed.ncbi.nlm.nih.gov/2671824/
The Benefits of Vitamin C
Antioxidant
Vitamin C is a powerful antioxidant essential for immune function, collagen formation, and the protection of cells from oxidative stress. We use vitamin C derived from acerola cherry, a whole-food source that provides naturally occurring bioflavonoids alongside the vitamin C, which may support better absorption compared to synthetic ascorbic acid.
Key Highlights
- Contributes to the normal function of the immune system (EFSA approved)
- Supports normal collagen formation for skin, blood vessels, bones, cartilage, gums, and teeth (EFSA approved)
- Contributes to the protection of cells from oxidative stress (EFSA approved)
- Increases iron absorption (EFSA approved)
- Contributes to the reduction of tiredness and fatigue (EFSA approved)
- Supports normal energy-yielding metabolism (EFSA approved)
- Derived from acerola cherry for enhanced bioavailability
Biochemistry Timeline
Vitamin C is water-soluble, meaning the body does not store it and relies on regular daily intake. Blood levels can improve within days of starting supplementation, and immune function benefits are generally seen with consistent daily intake of 200 mg or more.
For collagen-related benefits (skin firmness, wound healing), consistent supplementation over 8 to 12 weeks is typically needed to see visible improvements, as collagen turnover in the skin is a gradual process.
Energy and Fatigue
Vitamin C contributes to normal energy-yielding metabolism and to the reduction of tiredness and fatigue, both EFSA-approved health claims. It plays a role in the metabolism of fats and the production of carnitine, a molecule that helps transport fatty acids into mitochondria for energy production.
For those experiencing persistent fatigue, ensuring adequate vitamin C intake supports the body's ability to produce energy efficiently. This is particularly relevant for smokers, who have 25% lower plasma vitamin C levels and are recommended to consume an additional 35 mg/day (IOM recommendation).
Antioxidant Protection
Vitamin C is one of the body's primary water-soluble antioxidants. It neutralises free radicals, protects cellular components from oxidative damage, and helps regenerate other antioxidants, including vitamin E.
This antioxidant function is important for overall health, as oxidative stress is implicated in ageing, cardiovascular disease, and various chronic conditions. By choosing acerola cherry as our source, the naturally occurring bioflavonoids and plant compounds provide additional antioxidant support beyond vitamin C alone. EFSA recognises that vitamin C contributes to the protection of cells from oxidative stress.
Summary
Vitamin C is an essential antioxidant that supports immune function, collagen formation, iron absorption, and energy production. We use acerola cherry as a whole-food source, providing naturally occurring bioflavonoids for potentially enhanced absorption. Regular supplementation reduces cold duration and supports the body's daily needs.
As a water-soluble vitamin, consistent daily intake is important since the body does not store vitamin C. It is particularly relevant for those with higher needs, including smokers, women with iron absorption concerns, and anyone seeking to support skin health and immune resilience.
FAQs
Why acerola cherry instead of synthetic vitamin C?
Acerola cherry is one of nature's richest sources of vitamin C and provides it alongside bioflavonoids and other plant compounds that may enhance absorption and provide additional antioxidant benefits. It represents a whole-food approach to vitamin C supplementation.
How much vitamin C do I need daily?
The recommended daily intake for adults in the EU is 80 mg. For immune support during and after exercise, EFSA recognises benefits at 200 mg/day. The European upper limit is 1,000 mg/day from supplements. Most people benefit from 200-500 mg/day.
Can I take too much vitamin C?
Because vitamin C is water-soluble, excess amounts are excreted in urine. However, very high doses (above 1,000 mg/day) can cause digestive discomfort in some people and may increase the risk of kidney stones in susceptible individuals.
Does vitamin C really prevent colds?
Research shows that regular vitamin C supplementation does not prevent colds in the general population but does reduce their duration (by about 8% in adults) and severity. The benefit is more pronounced in those under physical stress.
Is vitamin C safe during pregnancy?
Yes, vitamin C is important during pregnancy for both mother and baby. It supports iron absorption, immune function, and collagen formation. Follow your healthcare provider's guidance on dosage.
Research
Hořavová H et al. – Ceska a Slovenska farmacie : casopis Ceske farmaceuticke spolecnosti a Slovenske farmaceuticke spolecnosti (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41412811/
Ivaskiene T et al. – Frontiers in nutrition (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41459089/
Kumar V et al. – Recent advances in food, nutrition & agriculture (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39108105/
Rawat et al. — J Med Life (2024). [Systematic review & MA]. General
Bayu P et al. – PloS one (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38820340/
Oargă Porumb DP et al. – Frontiers in pharmacology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38666029/
Hamie H et al. – International journal of women's dermatology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38873621/
Wylenzek F et al. – Archives of gynecology and obstetrics (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38935105/
Xu C et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37111066/
Zheng SH et al. – Reproductive biology and endocrinology : RB&E (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37644533/
Berry K et al. – Clinics in plastic surgery (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37169404/
Dumoulin M et al. - Journal of Cosmetic Dermatology (2023). [RCT]. Skin Health
Lee et al. — RCT (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/37786445/
Ordaz G et al. – Actas urologicas espanolas (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36754205/
Skolmowska D et al. – Nutrients (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35807904/
Berry K et al. – Facial plastic surgery clinics of North America (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35934431/
Wiesner A et al. – Pharmaceuticals (Basel, Switzerland) (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33801406/
Lykkesfeldt & Tveden-Nyborg — Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31405241/
Mousavi S et al. - European Journal of Clinical Nutrition (2019). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/30738092/
DiBaise M et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31144371/
Liugan M et al. – Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31487891/
Carr AC & Cook J — Front Physiol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29740326/
Carr & Maggini — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Pullar et al. — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28805671/
Carr AC & Maggini S - Nutrients (2017). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Skelin M et al. – Clinical therapeutics (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28153426/
Carr AC & Maggini S — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Pullar JM et al. — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28805671/
Moser & Chun — Adv Nutr (2016). [Review]. General
Moser MA & Chun OK - Nutrients (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27725322/
Smith et al. — Nutrients (2016). [Review]. General
White DJ et al. - Nutrients (2016). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/28045446/
Kennedy DO - Nutrients (2016). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/26828517/
Padayatty SJ & Levine M — Oral Dis (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/26808119/
Moser MA & Chun OK — Int J Mol Sci (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27649222/
Bucher A & White N — Front Immunol (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27994589/
Lykkesfeldt J et al. - British Journal of Nutrition (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24709223/
Lykkesfeldt J et al. — Adv Nutr (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24458010/
Hemilä — Cochrane Review (2013 (updated)). [Meta-analysis (29 RCTs)]. https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD000980.pub4
Hemilä & Chalker — Cochrane (2013). [Cochrane MA (29 RCTs)].
Hemilä & Chalker — Cochrane (2013). [Cochrane systematic review (29 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Hemilä H & Chalker E - Cochrane Database of Systematic Reviews (2013). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Hemila H & Chalker E — Cochrane Database Syst Rev (2013). [Cochrane review]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Michaels JA et al. - Advances in Skin & Wound Care (2012). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/22441049/
Stough C et al. - Human Psychopharmacology (2011). [RCT]. https://pubmed.ncbi.nlm.nih.gov/21905094/
Cosgrove MC et al. - American Journal of Clinical Nutrition (2007). [Cohort Study]. https://pubmed.ncbi.nlm.nih.gov/17921406/
Fishman SM et al. – Public health nutrition (2000). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/10948381/
IOM — Smoker recommendation (Established). [Expert guideline]. General
Antioxidant skin protection (Established). [Mechanistic]. General
Vitamin C absorption — whole food vs synthetic (Established). [Comparative]. General
Natural vs synthetic C — established (Established). [Comparative analysis].
51 studies — Vitamin C
Hořavová H et al. – Ceska a Slovenska farmacie : casopis Ceske farmaceuticke spolecnosti a Slovenske farmaceuticke spolecnosti (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41412811/
Ivaskiene T et al. – Frontiers in nutrition (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41459089/
Kumar V et al. – Recent advances in food, nutrition & agriculture (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39108105/
Rawat et al. — J Med Life (2024). [Systematic review & MA]. General
Bayu P et al. – PloS one (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38820340/
Oargă Porumb DP et al. – Frontiers in pharmacology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38666029/
Hamie H et al. – International journal of women's dermatology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38873621/
Wylenzek F et al. – Archives of gynecology and obstetrics (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38935105/
Xu C et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37111066/
Zheng SH et al. – Reproductive biology and endocrinology : RB&E (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37644533/
Berry K et al. – Clinics in plastic surgery (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37169404/
Dumoulin M et al. - Journal of Cosmetic Dermatology (2023). [RCT]. Skin Health
Lee et al. — RCT (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/37786445/
Ordaz G et al. – Actas urologicas espanolas (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36754205/
Skolmowska D et al. – Nutrients (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35807904/
Berry K et al. – Facial plastic surgery clinics of North America (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35934431/
Wiesner A et al. – Pharmaceuticals (Basel, Switzerland) (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33801406/
Lykkesfeldt & Tveden-Nyborg — Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31405241/
Mousavi S et al. - European Journal of Clinical Nutrition (2019). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/30738092/
DiBaise M et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31144371/
Liugan M et al. – Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31487891/
Carr AC & Cook J — Front Physiol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29740326/
Carr & Maggini — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Pullar et al. — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28805671/
Carr AC & Maggini S - Nutrients (2017). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Skelin M et al. – Clinical therapeutics (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28153426/
Carr AC & Maggini S — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Pullar JM et al. — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28805671/
Moser & Chun — Adv Nutr (2016). [Review]. General
Moser MA & Chun OK - Nutrients (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27725322/
Smith et al. — Nutrients (2016). [Review]. General
White DJ et al. - Nutrients (2016). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/28045446/
Kennedy DO - Nutrients (2016). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/26828517/
Padayatty SJ & Levine M — Oral Dis (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/26808119/
Moser MA & Chun OK — Int J Mol Sci (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27649222/
Bucher A & White N — Front Immunol (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27994589/
Lykkesfeldt J et al. - British Journal of Nutrition (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24709223/
Lykkesfeldt J et al. — Adv Nutr (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24458010/
Hemilä — Cochrane Review (2013 (updated)). [Meta-analysis (29 RCTs)]. https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD000980.pub4
Hemilä & Chalker — Cochrane (2013). [Cochrane MA (29 RCTs)].
Hemilä & Chalker — Cochrane (2013). [Cochrane systematic review (29 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Hemilä H & Chalker E - Cochrane Database of Systematic Reviews (2013). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Hemila H & Chalker E — Cochrane Database Syst Rev (2013). [Cochrane review]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Michaels JA et al. - Advances in Skin & Wound Care (2012). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/22441049/
Stough C et al. - Human Psychopharmacology (2011). [RCT]. https://pubmed.ncbi.nlm.nih.gov/21905094/
Cosgrove MC et al. - American Journal of Clinical Nutrition (2007). [Cohort Study]. https://pubmed.ncbi.nlm.nih.gov/17921406/
Fishman SM et al. – Public health nutrition (2000). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/10948381/
IOM — Smoker recommendation (Established). [Expert guideline]. General
Antioxidant skin protection (Established). [Mechanistic]. General
Vitamin C absorption — whole food vs synthetic (Established). [Comparative]. General
Natural vs synthetic C — established (Established). [Comparative analysis].
The Benefits of Vitamin B2
Bioavailable Form
Riboflavin (Vitamin B2) is an essential water-soluble vitamin that plays a key role in energy production, cellular function, and the metabolism of fats, drugs, and steroids. It acts as a precursor to the coenzymes FAD and FMN, which are involved in numerous metabolic reactions including the electron transport chain that generates cellular energy.
Key Highlights
- Contributes to normal energy-yielding metabolism (EFSA approved)
- Supports the reduction of tiredness and fatigue (EFSA approved)
- Contributes to maintenance of normal skin and mucous membranes (EFSA approved)
- Supports maintenance of normal vision (EFSA approved)
- Contributes to protection of cells from oxidative stress (EFSA approved)
- Supports normal functioning of the nervous system (EFSA approved)
- Contributes to normal iron metabolism (EFSA approved)
Biochemistry Timeline
Riboflavin is water-soluble and rapidly absorbed. Blood levels respond within days of supplementation. The bright yellow urine some people notice when taking B vitamins is due to riboflavin and is completely harmless.
Iron Metabolism
Riboflavin contributes to normal iron metabolism, supporting the body's ability to absorb, transport, and utilise iron. This makes it a supportive nutrient alongside iron supplementation, particularly for women at risk of iron deficiency.
Nervous System
Riboflavin contributes to normal functioning of the nervous system. Its role in energy production is particularly important for nerve cells, which have high metabolic demands. Some research has also explored riboflavin's potential role in migraine prevention at higher doses (400 mg/day), though this is beyond standard nutritional supplementation.
Summary
Riboflavin (Vitamin B2) is essential for energy production, skin health, vision, antioxidant protection, and iron metabolism. It is well-absorbed, safe, and the bright yellow urine sometimes caused by B-complex supplements is due to riboflavin and is completely harmless.
FAQs
Why does my urine turn yellow when taking B vitamins?
The bright yellow colour is caused by riboflavin (B2) and is completely normal and harmless. It simply indicates that your body is absorbing the vitamin and excreting the excess.
How much riboflavin do I need?
The recommended daily intake for adults is 1.1-1.4 mg. There is no established upper limit as excess is excreted in urine.
Is riboflavin safe during pregnancy?
Yes, riboflavin is important during pregnancy. Recommended intake is slightly higher during pregnancy and breastfeeding.
Research
Dai L, Wang B, Fan W et al. (2026). Oligomeric ultranano hydrogen water improves flock uniformity, antioxidant capacity and intestinal health in growth phase layer-type chickens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41846073/
Tia A, Hauser J, Konan AG et al. (2026). Systematic Review of Nutrients' Impact on Cognition and School Performance in School-Aged Children in Sub-Saharan Africa. Nutr Rev. https://pubmed.ncbi.nlm.nih.gov/41824300/
Beckman KA, Parkhurst GD, Lee JH et al. (2026). Randomized, Controlled Study to Evaluate the Safety and Efficacy of Oxygen-Enriched Epithelium-On Corneal Cross-Linking for the Treatment of Keratoconus. Ophthalmol Ther. https://pubmed.ncbi.nlm.nih.gov/41824263/
Ambrósio JA, Brissos J, Tardão GC et al. (2026). Tomographic and Biomechanical Stability of the Non-operated Eye in Asymmetric Keratoconus with Unilateral Intracorneal Ring Segment Implantation. Ophthalmol Ther. https://pubmed.ncbi.nlm.nih.gov/41811402/
Rapuano CJ, Beckman KA, Rajpal R (2026). The Critical Role of Oxygen Supplementation in Epithelium-On Corneal Cross-Linking: A Narrative Review. Adv Ther [Review]. https://pubmed.ncbi.nlm.nih.gov/41774369/
Quiles-Pérez CJ, Olzak A, Fofana A et al. (2026). Anaerobic riboflavin degradation by human gut Lachnospiraceae. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41757019/
Ben Hilal H, Zhang J, Liu X et al. (2026). In Vivo Evaluation of Efficacy and Safety of Oxygen-Supplemented Accelerated Scleral Cross-Linking Over Time in Young Rabbits. Transl Vis Sci Technol. https://pubmed.ncbi.nlm.nih.gov/41733420/
Chen Z, Lai L, Lu X et al. (2026). Case Report: SLC52A2 variants cause Brown-Vialetto-Van Laere syndrome type 2, characterized by pure red cell aplastic anemia: clinical and genetic features of three Chinese children. Front Pediatr. https://pubmed.ncbi.nlm.nih.gov/41727768/
Lim RR, Zhao E, Hass DT et al. (2026). Nutrient microenvironments reprogram RPE metabolism. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41727089/
Shabbir U, McNulty H, Hughes C et al. (2026). B vitamins, immune function and the ageing brain: a critical review of the evidence, mechanisms and potential role of the gut microbiome. Proc Nutr Soc [Review]. https://pubmed.ncbi.nlm.nih.gov/41693429/
Bjørke-Monsen AL, Torsvik IK, Bentsen MHL et al. (2026). Exclusive Breastfeeding Is Not Ensuring an Adequate Vitamin B Status in Premature Infants with Very Low Birth Weight. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41683246/
Işık T, Garipağaoğlu M (2026). Assessment of the nutritional status of Syrian refugee women in the lactation period. Nutr Health. https://pubmed.ncbi.nlm.nih.gov/41662259/
Zhao Z, Shi S, Zhang L et al. (2026). Metabolic modulation of yogurt fermentation kinetics and acidification by Bifidobacterium-starter culture interactions. Front Microbiol. https://pubmed.ncbi.nlm.nih.gov/41657908/
Nordin BA (2026). Comparative Efficacy and Safety of Conventional Dresden, Transepithelial, and Accelerated Corneal Collagen Cross-Linking Protocols for Progressive Keratoconus: A Systematic Review. Cureus [Review]. https://pubmed.ncbi.nlm.nih.gov/41641181/
Jaruseviciene R, Tamuleviciute R, Galgauskas S (2026). Corneal Cross-Linking in Keratoconus: Comparative Analysis of Standard, Accelerated and Transepithelial Protocols. J Clin Med [Review]. https://pubmed.ncbi.nlm.nih.gov/41598429/
Tong T, Huang X, Li L et al. (2026). Microbial metabolite FAD mobilizes adipocyte lipid remodeling to enhance cancer immunotherapy efficacy. Cell Metab. https://pubmed.ncbi.nlm.nih.gov/41570815/
Duffy B, Patted A, Boelig RC et al. (2025). Can riboflavin offer a novel personalised strategy for maintaining healthy blood pressure in pregnancy in populations globally?. BMJ Nutr Prev Health [Review]. https://pubmed.ncbi.nlm.nih.gov/41768514/
Rocchetti G, Catellani A, Lapris M et al. (2025). Plasma Metabolomics Reveals Systemic Metabolic Remodeling in Early-Lactation Dairy Cows Fed a Fusarium-Contaminated Diet and Supplemented with a Mycotoxin-Deactivating Product. Toxins (Basel). https://pubmed.ncbi.nlm.nih.gov/41591156/
Feely J, Saliba N, Nze N et al. (2025). Progressive Weakness in Adulthood: Lipid Storage Myopathy With Suspected Sertraline-Associated Etiology. Cureus. https://pubmed.ncbi.nlm.nih.gov/41555972/
Wang Q, Zhang N, Sun L et al. (2025). Riboflavin Increases Goat Sperm Motility via Enhancement of Mitochondrial β-Oxidation. Biology (Basel). https://pubmed.ncbi.nlm.nih.gov/41514925/
20 studies — Vitamin B2
Dai L, Wang B, Fan W et al. (2026). Oligomeric ultranano hydrogen water improves flock uniformity, antioxidant capacity and intestinal health in growth phase layer-type chickens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41846073/
Tia A, Hauser J, Konan AG et al. (2026). Systematic Review of Nutrients' Impact on Cognition and School Performance in School-Aged Children in Sub-Saharan Africa. Nutr Rev. https://pubmed.ncbi.nlm.nih.gov/41824300/
Beckman KA, Parkhurst GD, Lee JH et al. (2026). Randomized, Controlled Study to Evaluate the Safety and Efficacy of Oxygen-Enriched Epithelium-On Corneal Cross-Linking for the Treatment of Keratoconus. Ophthalmol Ther. https://pubmed.ncbi.nlm.nih.gov/41824263/
Ambrósio JA, Brissos J, Tardão GC et al. (2026). Tomographic and Biomechanical Stability of the Non-operated Eye in Asymmetric Keratoconus with Unilateral Intracorneal Ring Segment Implantation. Ophthalmol Ther. https://pubmed.ncbi.nlm.nih.gov/41811402/
Rapuano CJ, Beckman KA, Rajpal R (2026). The Critical Role of Oxygen Supplementation in Epithelium-On Corneal Cross-Linking: A Narrative Review. Adv Ther [Review]. https://pubmed.ncbi.nlm.nih.gov/41774369/
Quiles-Pérez CJ, Olzak A, Fofana A et al. (2026). Anaerobic riboflavin degradation by human gut Lachnospiraceae. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41757019/
Ben Hilal H, Zhang J, Liu X et al. (2026). In Vivo Evaluation of Efficacy and Safety of Oxygen-Supplemented Accelerated Scleral Cross-Linking Over Time in Young Rabbits. Transl Vis Sci Technol. https://pubmed.ncbi.nlm.nih.gov/41733420/
Chen Z, Lai L, Lu X et al. (2026). Case Report: SLC52A2 variants cause Brown-Vialetto-Van Laere syndrome type 2, characterized by pure red cell aplastic anemia: clinical and genetic features of three Chinese children. Front Pediatr. https://pubmed.ncbi.nlm.nih.gov/41727768/
Lim RR, Zhao E, Hass DT et al. (2026). Nutrient microenvironments reprogram RPE metabolism. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41727089/
Shabbir U, McNulty H, Hughes C et al. (2026). B vitamins, immune function and the ageing brain: a critical review of the evidence, mechanisms and potential role of the gut microbiome. Proc Nutr Soc [Review]. https://pubmed.ncbi.nlm.nih.gov/41693429/
Bjørke-Monsen AL, Torsvik IK, Bentsen MHL et al. (2026). Exclusive Breastfeeding Is Not Ensuring an Adequate Vitamin B Status in Premature Infants with Very Low Birth Weight. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41683246/
Işık T, Garipağaoğlu M (2026). Assessment of the nutritional status of Syrian refugee women in the lactation period. Nutr Health. https://pubmed.ncbi.nlm.nih.gov/41662259/
Zhao Z, Shi S, Zhang L et al. (2026). Metabolic modulation of yogurt fermentation kinetics and acidification by Bifidobacterium-starter culture interactions. Front Microbiol. https://pubmed.ncbi.nlm.nih.gov/41657908/
Nordin BA (2026). Comparative Efficacy and Safety of Conventional Dresden, Transepithelial, and Accelerated Corneal Collagen Cross-Linking Protocols for Progressive Keratoconus: A Systematic Review. Cureus [Review]. https://pubmed.ncbi.nlm.nih.gov/41641181/
Jaruseviciene R, Tamuleviciute R, Galgauskas S (2026). Corneal Cross-Linking in Keratoconus: Comparative Analysis of Standard, Accelerated and Transepithelial Protocols. J Clin Med [Review]. https://pubmed.ncbi.nlm.nih.gov/41598429/
Tong T, Huang X, Li L et al. (2026). Microbial metabolite FAD mobilizes adipocyte lipid remodeling to enhance cancer immunotherapy efficacy. Cell Metab. https://pubmed.ncbi.nlm.nih.gov/41570815/
Duffy B, Patted A, Boelig RC et al. (2025). Can riboflavin offer a novel personalised strategy for maintaining healthy blood pressure in pregnancy in populations globally?. BMJ Nutr Prev Health [Review]. https://pubmed.ncbi.nlm.nih.gov/41768514/
Rocchetti G, Catellani A, Lapris M et al. (2025). Plasma Metabolomics Reveals Systemic Metabolic Remodeling in Early-Lactation Dairy Cows Fed a Fusarium-Contaminated Diet and Supplemented with a Mycotoxin-Deactivating Product. Toxins (Basel). https://pubmed.ncbi.nlm.nih.gov/41591156/
Feely J, Saliba N, Nze N et al. (2025). Progressive Weakness in Adulthood: Lipid Storage Myopathy With Suspected Sertraline-Associated Etiology. Cureus. https://pubmed.ncbi.nlm.nih.gov/41555972/
Wang Q, Zhang N, Sun L et al. (2025). Riboflavin Increases Goat Sperm Motility via Enhancement of Mitochondrial β-Oxidation. Biology (Basel). https://pubmed.ncbi.nlm.nih.gov/41514925/
The Benefits of Niacin
Stable form
Niacin (Vitamin B3) is an essential water-soluble vitamin that plays a central role in energy metabolism. It is a precursor to NAD and NADP, two coenzymes involved in over 400 enzymatic reactions in the body. Niacin supports energy production, DNA repair, skin health, and nervous system function.
Key Highlights
- Contributes to normal energy-yielding metabolism (EFSA approved)
- Supports the reduction of tiredness and fatigue (EFSA approved)
- Contributes to maintenance of normal skin and mucous membranes (EFSA approved)
- Supports normal psychological function (EFSA approved)
- Contributes to normal functioning of the nervous system (EFSA approved)
- NAD/NADP coenzymes involved in over 400 enzymatic reactions
Biochemistry Timeline
Niacin is water-soluble and quickly absorbed. Blood levels respond within days. Note: nicotinic acid (one form of niacin) can cause a harmless "flush" (warmth, redness of skin) at higher doses. Nicotinamide does not cause this effect.
DNA Repair and Cellular Health
NAD plays a role in DNA repair through enzymes called PARPs (poly ADP-ribose polymerases) and sirtuins. These pathways are increasingly recognised as important for cellular maintenance and longevity. Adequate niacin intake supports the body's ability to repair DNA damage from normal metabolic processes and environmental exposures.
Cardiovascular Support
High-dose nicotinic acid has been used clinically to support healthy cholesterol levels. However, this is a pharmaceutical application at doses well above nutritional supplementation and should only be used under medical supervision. At nutritional doses, niacin supports overall cardiovascular health through its role in energy metabolism and cellular function.
Summary
Niacin (Vitamin B3) is a versatile vitamin whose coenzyme forms (NAD, NADP) are involved in over 400 reactions. It supports energy metabolism, skin health, nervous system function, and DNA repair. EFSA recognises multiple health claims including contributions to energy metabolism, tiredness reduction, skin maintenance, and psychological function.
FAQs
What is the "niacin flush"?
Nicotinic acid can cause a harmless temporary warmth and redness of the skin. This is called the niacin flush and is not dangerous. Nicotinamide (niacinamide) does not cause this effect.
How much niacin do I need?
The recommended daily intake for adults is 13-16 mg NE (niacin equivalents). The European upper limit for nicotinic acid is 10 mg/day; for nicotinamide it is 900 mg/day.
Is niacin safe during pregnancy?
Yes, niacin is essential during pregnancy. Recommended intake is slightly higher during pregnancy.
Research
Højfeldt G, Michaud J, Damgaard A et al. (2026). Nicotinamide and Pyridoxine Supplementation Enhances Muscle Stem Cell Activity and Muscle Regeneration in Humans: A Randomized Placebo-Controlled Clinical Trial of High Force Eccentric Contraction Recovery in Healthy Young Men. Adv Sci (Weinh). https://pubmed.ncbi.nlm.nih.gov/41874466/
Berven H, Svensen M, Eikeland H et al. (2026). The NAD-brain pharmacokinetic study of NAD augmentation in blood and brain using oral precursor supplementation. iScience. https://pubmed.ncbi.nlm.nih.gov/41858901/
Li Y, Bao T, Gao L et al. (2026). Aging Triggers an Intestinal Energy Crisis and HDL3 Deficiency Disrupting Gut-Liver Axis Homeostasis. Aging Cell. https://pubmed.ncbi.nlm.nih.gov/41851037/
Sayles NM, Casalena G, Zhao D et al. (2026). Pregnancy precipitates metabolic imbalance and accelerates death in an animal model of mitochondrial cardiomyopathy. Mol Metab. https://pubmed.ncbi.nlm.nih.gov/41850395/
Qian X, Xu L, Zheng Y et al. (2026). Senescence-associated metabolic alterations aggravate calcific aortic valve disease. Eur Heart J. https://pubmed.ncbi.nlm.nih.gov/41841768/
Zhang F, Zhang H, Wang P et al. (2026). The NAD salvage pathway enzyme NMNAT-C sustains dark-phase NAD+ homeostasis in cyanobacteria. Plant Physiol. https://pubmed.ncbi.nlm.nih.gov/41838801/
Bai Y, Zhou Y, Wang G et al. (2026). Niacin Mitigates Cyclophosphamide-Induced Immunosuppression by Maintaining Intestinal Homeostasis and Regulating the HCAR2/NLRP3 and PTGS2/PGE2 Signaling Pathways. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41829914/
Granvillano G, Mercogliano M, Vecchietti A et al. (2026). An Umbrella Review on the Prevention of Skin Diseases: Do Specific Nutrients Play a Protective Role?. Prev Nutr Food Sci [Review]. https://pubmed.ncbi.nlm.nih.gov/41815197/
Carpenter BJ, Lecacheur M, Mangold YN et al. (2026). NAD(+) controls circadian rhythmicity during cardiac aging. Commun Biol. https://pubmed.ncbi.nlm.nih.gov/41813966/
Pei Z, Liang F, Wang X et al. (2026). NAD⁺ as a central metabolic hub Regulating the hallmarks of aging: Mechanisms and therapeutic implications. Mech Ageing Dev. https://pubmed.ncbi.nlm.nih.gov/41812700/
Huang J, Qin Q, Li X et al. (2026). Bacteroides-associated NAD⁺ depletion correlates with exacerbated radiation-induced colorectal injury and impaired mucosal proliferative capacity. Gut Microbes. https://pubmed.ncbi.nlm.nih.gov/41807298/
Zhou H, Zhao X, Li Y et al. (2026). Nicotinamide mononucleotide supplementation modulates gut microbiota and metabolites to mitigate Alzheimer's disease pathology in APP/PS1 mice. J Alzheimers Dis. https://pubmed.ncbi.nlm.nih.gov/41805251/
Zhou E, Zhao H, Yu Y et al. (2026). Combined exposure of cold and hypoxia: a driver for hypertension and the underlying role of the microbiota-gut-brain axis. J Hypertens. https://pubmed.ncbi.nlm.nih.gov/41800819/
Huang Y, Zhao E, Zhao G et al. (2026). H3K18 lactylation-mediated SPHK1-SIRT1 feedback loop accelerates pyroptosis of tubular epithelial cells in sepsis-associated acute kidney injury. Theranostics. https://pubmed.ncbi.nlm.nih.gov/41799201/
Dong M, Zhang Q, Wang Y et al. (2026). Restructuring tilth layers suppresses cotton Verticillium wilt through the niacinamide-mediated enrichment of beneficial Pseudomonas. Microbiol Res. https://pubmed.ncbi.nlm.nih.gov/41793890/
Saida M, Saeki N, Sakai H et al. (2026). β-Nicotinamide mononucleotide preserves muscle strength in septic male mice. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41792260/
Kim JH, Park SJ, Lee JA et al. (2026). PRPS1 (p.V42L) Mutation in Arts Syndrome Induces Aberrant Neural Stem Cell Development and Neuronal Senescence-Like Phenotype: Rescue by Nicotinamide Mononucleotide Supplementation. Int J Stem Cells. https://pubmed.ncbi.nlm.nih.gov/41787648/
Zhou Y, Wu X, Xu X et al. (2026). Sirt1-eIF2α axis drives pro-inflammatory macrophage activation through ER stress aggravating liver IRI in aged mice. Biochem Biophys Res Commun. https://pubmed.ncbi.nlm.nih.gov/41775225/
Zhang D, Li Z, Meng X et al. (2026). Nicotinamide Mononucleotide Decreases Secretion of Proinflammatory Cytokines via the NAD (+) /SIRT1/p65 Axis. ACS Omega. https://pubmed.ncbi.nlm.nih.gov/41768621/
Jin X, Luo X, Shen W et al. (2026). Nicotinamide Riboside Alleviates Heat Stress-Induced Intestinal Dysfunction by Enhancing Antioxidant Capacity, Restoring Immune Homeostasis, and Modulating Gut Microbiota in a Boar Model. Mol Nutr Food Res. https://pubmed.ncbi.nlm.nih.gov/41761881/
20 studies — Niacin
Højfeldt G, Michaud J, Damgaard A et al. (2026). Nicotinamide and Pyridoxine Supplementation Enhances Muscle Stem Cell Activity and Muscle Regeneration in Humans: A Randomized Placebo-Controlled Clinical Trial of High Force Eccentric Contraction Recovery in Healthy Young Men. Adv Sci (Weinh). https://pubmed.ncbi.nlm.nih.gov/41874466/
Berven H, Svensen M, Eikeland H et al. (2026). The NAD-brain pharmacokinetic study of NAD augmentation in blood and brain using oral precursor supplementation. iScience. https://pubmed.ncbi.nlm.nih.gov/41858901/
Li Y, Bao T, Gao L et al. (2026). Aging Triggers an Intestinal Energy Crisis and HDL3 Deficiency Disrupting Gut-Liver Axis Homeostasis. Aging Cell. https://pubmed.ncbi.nlm.nih.gov/41851037/
Sayles NM, Casalena G, Zhao D et al. (2026). Pregnancy precipitates metabolic imbalance and accelerates death in an animal model of mitochondrial cardiomyopathy. Mol Metab. https://pubmed.ncbi.nlm.nih.gov/41850395/
Qian X, Xu L, Zheng Y et al. (2026). Senescence-associated metabolic alterations aggravate calcific aortic valve disease. Eur Heart J. https://pubmed.ncbi.nlm.nih.gov/41841768/
Zhang F, Zhang H, Wang P et al. (2026). The NAD salvage pathway enzyme NMNAT-C sustains dark-phase NAD+ homeostasis in cyanobacteria. Plant Physiol. https://pubmed.ncbi.nlm.nih.gov/41838801/
Bai Y, Zhou Y, Wang G et al. (2026). Niacin Mitigates Cyclophosphamide-Induced Immunosuppression by Maintaining Intestinal Homeostasis and Regulating the HCAR2/NLRP3 and PTGS2/PGE2 Signaling Pathways. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41829914/
Granvillano G, Mercogliano M, Vecchietti A et al. (2026). An Umbrella Review on the Prevention of Skin Diseases: Do Specific Nutrients Play a Protective Role?. Prev Nutr Food Sci [Review]. https://pubmed.ncbi.nlm.nih.gov/41815197/
Carpenter BJ, Lecacheur M, Mangold YN et al. (2026). NAD(+) controls circadian rhythmicity during cardiac aging. Commun Biol. https://pubmed.ncbi.nlm.nih.gov/41813966/
Pei Z, Liang F, Wang X et al. (2026). NAD⁺ as a central metabolic hub Regulating the hallmarks of aging: Mechanisms and therapeutic implications. Mech Ageing Dev. https://pubmed.ncbi.nlm.nih.gov/41812700/
Huang J, Qin Q, Li X et al. (2026). Bacteroides-associated NAD⁺ depletion correlates with exacerbated radiation-induced colorectal injury and impaired mucosal proliferative capacity. Gut Microbes. https://pubmed.ncbi.nlm.nih.gov/41807298/
Zhou H, Zhao X, Li Y et al. (2026). Nicotinamide mononucleotide supplementation modulates gut microbiota and metabolites to mitigate Alzheimer's disease pathology in APP/PS1 mice. J Alzheimers Dis. https://pubmed.ncbi.nlm.nih.gov/41805251/
Zhou E, Zhao H, Yu Y et al. (2026). Combined exposure of cold and hypoxia: a driver for hypertension and the underlying role of the microbiota-gut-brain axis. J Hypertens. https://pubmed.ncbi.nlm.nih.gov/41800819/
Huang Y, Zhao E, Zhao G et al. (2026). H3K18 lactylation-mediated SPHK1-SIRT1 feedback loop accelerates pyroptosis of tubular epithelial cells in sepsis-associated acute kidney injury. Theranostics. https://pubmed.ncbi.nlm.nih.gov/41799201/
Dong M, Zhang Q, Wang Y et al. (2026). Restructuring tilth layers suppresses cotton Verticillium wilt through the niacinamide-mediated enrichment of beneficial Pseudomonas. Microbiol Res. https://pubmed.ncbi.nlm.nih.gov/41793890/
Saida M, Saeki N, Sakai H et al. (2026). β-Nicotinamide mononucleotide preserves muscle strength in septic male mice. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41792260/
Kim JH, Park SJ, Lee JA et al. (2026). PRPS1 (p.V42L) Mutation in Arts Syndrome Induces Aberrant Neural Stem Cell Development and Neuronal Senescence-Like Phenotype: Rescue by Nicotinamide Mononucleotide Supplementation. Int J Stem Cells. https://pubmed.ncbi.nlm.nih.gov/41787648/
Zhou Y, Wu X, Xu X et al. (2026). Sirt1-eIF2α axis drives pro-inflammatory macrophage activation through ER stress aggravating liver IRI in aged mice. Biochem Biophys Res Commun. https://pubmed.ncbi.nlm.nih.gov/41775225/
Zhang D, Li Z, Meng X et al. (2026). Nicotinamide Mononucleotide Decreases Secretion of Proinflammatory Cytokines via the NAD (+) /SIRT1/p65 Axis. ACS Omega. https://pubmed.ncbi.nlm.nih.gov/41768621/
Jin X, Luo X, Shen W et al. (2026). Nicotinamide Riboside Alleviates Heat Stress-Induced Intestinal Dysfunction by Enhancing Antioxidant Capacity, Restoring Immune Homeostasis, and Modulating Gut Microbiota in a Boar Model. Mol Nutr Food Res. https://pubmed.ncbi.nlm.nih.gov/41761881/
The Benefits of Inositol
Natural form
Myo-Inositol is a naturally occurring compound that the body produces and that is found in many foods. It functions as a secondary messenger in insulin signalling pathways and plays a role in cellular communication. Research has focused particularly on its potential benefits for hormonal balance, insulin sensitivity, and reproductive health, especially in women with polycystic ovary syndrome (PCOS).
Key Highlights
- Supports insulin sensitivity by acting as secondary messenger in insulin signalling
- May improve menstrual cycle regularity in women with PCOS
- Comparable efficacy to metformin for insulin sensitivity (SOGC, 2025)
- Better tolerated than metformin (fewer GI side effects)
- May support oocyte quality and IVF outcomes
- Typical dose: 4 g/day (4,000 mg/day)
Biochemistry Timeline
Myo-inositol supplementation typically requires 3 to 6 months for meaningful effects on hormonal parameters and menstrual regularity. Improvements in insulin sensitivity may begin within 4 to 8 weeks, but cycle-related benefits often take longer.
The typical studied dose is 4 g/day (4,000 mg/day), usually taken in two divided doses with meals. Inositol is water-soluble and well-absorbed, and is often combined with folic acid in formulations designed for women's hormonal health.
Mood and Anxiety Support
Inositol has been studied for its potential effects on mood and anxiety. It is involved in the signalling pathways of several neurotransmitters, including serotonin, and research has explored its use at higher doses (up to 12-18 g/day) for mood and anxiety support.
While the evidence for mood support is still developing and the doses studied are much higher than those used for metabolic health, it highlights inositol's role in brain chemistry. At standard supplementation doses (4 g/day), any mood benefits are likely modest but may contribute to overall well-being, particularly when hormonal balance improves.
Metabolic Health
Beyond insulin sensitivity, myo-inositol may support broader metabolic health markers. The Fitz et al. (2024) review of PCOS international guidelines noted evidence for benefits on "some metabolic measures," including glucose metabolism and lipid profiles.
For women with PCOS or insulin resistance, supporting metabolic health is important not just for current symptoms but for long-term health outcomes, as insulin resistance is associated with increased risk of type 2 diabetes and cardiovascular disease. Myo-inositol offers a supportive tool alongside diet, exercise, and medical management.
Summary
Myo-Inositol is a naturally occurring compound that supports insulin signalling and may benefit women with PCOS by improving insulin sensitivity, menstrual regularity, and potentially fertility outcomes. At 4 g/day, it shows comparable efficacy to metformin for insulin sensitivity, with fewer side effects.
We value honesty about the evidence: while promising, myo-inositol is not yet recommended in international guidelines for fertility in PCOS, and the evidence base has limitations. It works best as a supportive supplement within a comprehensive approach to hormonal health, guided by healthcare professionals. Benefits typically develop over 3 to 6 months of consistent use.
FAQs
How much myo-inositol should I take?
The most commonly studied dose is 4 g/day (4,000 mg/day), usually divided into two doses taken with meals. This is the dose recognised by the SOGC for insulin sensitivity and menstrual regularity benefits.
Is myo-inositol only for women with PCOS?
While most research focuses on PCOS, myo-inositol is a naturally occurring compound in the body and may support insulin sensitivity in anyone with metabolic concerns. However, the strongest evidence is in the context of PCOS.
What is the difference between myo-inositol and D-chiro-inositol?
Both are forms of inositol with different roles in the body. Myo-inositol is the most abundant and well-studied form. D-chiro-inositol supports insulin signalling in different tissues. The optimal ratio of MI:DCI is generally considered to be 40:1, which reflects the natural ratio in the body.
How long before I see results?
Insulin sensitivity improvements may begin within 4 to 8 weeks. Menstrual regularity and hormonal changes typically require 3 to 6 months. Patience and consistency are important.
Is myo-inositol safe during pregnancy?
Research has explored myo-inositol during pregnancy, particularly for gestational diabetes prevention. It is generally considered safe, but consult your healthcare provider for personalised guidance.
Research
Soto Jacome C et al. – The Journal of clinical endocrinology and metabolism (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41225692/
Zhang et al. - MI in IVF outcomes SR/MA (2025). [Systematic Review & Meta-Analysis (RCTs)]. https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2025.1520362/full
SOGC Position Statement - Inositol for PCOS (2025). [Clinical Position Statement (literature review to Oct 2024)]. https://sogc.org/
Palomba et al. - MI in reproductive management critical review (2025). [Critical Review]. https://www.sciencedirect.com/science/article/abs/pii/S1472648325004766
Akbari Sene et al. — Int J Reprod BioMed (2025). [Systematic review & MA of RCTs]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12413536/
SOGC Position Statement (2025). [Clinical guideline (SOGC)]. https://sogc.org
Zhang et al. — Front Endocrinol (2025). [Systematic review & MA]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11968372/
SOGC Position Statement — Inositol for PCOS (2025). [Clinical Position Statement]. https://sogc.org/
Akbari Sene et al. — PMC (2025). [Systematic review & MA (RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12413536/
Zhang et al. — Front Endocrinol (2025). [Systematic review & MA (RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11968372/
Inositol cardiometabolic MA — PMC (2025). [Systematic review & MA (GRADE-assessed)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12574088/
Gul M et al. – Naunyn-Schmiedeberg's archives of pharmacology (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/39847053/
Ozay OE et al. – Ginekologia polska (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40665752/
Maddock RJ et al. – Molecular psychiatry (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40913113/
Fitz et al. - PCOS International Guidelines SR/MA (2024). [Systematic Review & Meta-Analysis (30 RCTs, n=2,230)]. https://pubmed.ncbi.nlm.nih.gov/38163998/
Fitz et al. — J Clin Endocrinol Metab (2024). [Systematic review & MA (30 RCTs, n=2230)]. https://pubmed.ncbi.nlm.nih.gov/38163998/
Fitz et al. — J Clin Endocrinol Metab (2024). [Systematic review & MA (PCOS Guidelines)]. https://pubmed.ncbi.nlm.nih.gov/38163998/
Li C et al. – Archives of gynecology and obstetrics (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37308791/
Chen H et al. – The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39115013/
Yavari M et al. – Expert review of endocrinology & metabolism (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38147023/
Razavi SA et al. – Cancer medicine (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38646957/
Motuhifonua SK et al. – The Cochrane database of systematic reviews (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36790138/
Fatima K et al. – Irish journal of medical science (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37148410/
Greff D et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37836508/
Jethaliya H et al. – Reproductive sciences (Thousand Oaks, Calif.) (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35477841/
Zhang JQ et al. – European review for medical and pharmacological sciences (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35363325/
Kachhawa G et al. – International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/34624138/
Li L et al. – European journal of obstetrics, gynecology, and reproductive biology (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35460931/
Liu Q et al. – Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35575290/
Wei J et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35889788/
Tang Q et al. – Medicine (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35475799/
Regidor et al. — Front Endocrinol (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33790860/
Zhao H et al. – Reproductive health (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34407851/
Azizi Kutenaei M et al. – European review for medical and pharmacological sciences (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33877679/
Chan KY et al. – Archives of gynecology and obstetrics (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33745021/
Facchinetti et al. — Gynecol Endocrinol (2020). [Expert consensus]. https://pubmed.ncbi.nlm.nih.gov/31553240/
Showell MG et al. – The Cochrane database of systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32851663/
Griffith RJ et al. – The Cochrane database of systematic reviews (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32526091/
Nordio M et al. – European review for medical and pharmacological sciences (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31298405/
Mendoza N et al. – Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/30880505/
Laganà AS et al. – Archives of gynecology and obstetrics (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30078122/
Unfer et al. - MI effects in PCOS women MA (2017). [Meta-Analysis (9 RCTs, n=496)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC5655679/
Unfer et al. — Eur Rev Med Pharmacol Sci (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28537652/
Nordio M et al. – European review for medical and pharmacological sciences (2017). [RCT]. https://pubmed.ncbi.nlm.nih.gov/28724185/
Mukai T et al. – Human psychopharmacology (2014). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/24424706/
Colazingari S et al. – Archives of gynecology and obstetrics (2013). [RCT]. https://pubmed.ncbi.nlm.nih.gov/23708322/
Nordio M et al. – European review for medical and pharmacological sciences (2012). [RCT]. https://pubmed.ncbi.nlm.nih.gov/22774396/
Papaleo E et al. – Fertility and sterility (2009). [RCT]. https://pubmed.ncbi.nlm.nih.gov/18462730/
Palatnik A et al. – Journal of clinical psychopharmacology (2001). [RCT]. https://pubmed.ncbi.nlm.nih.gov/11386498/
Benjamin J et al. – Journal of psychiatric research (1997). [RCT]. https://pubmed.ncbi.nlm.nih.gov/9352475/
50 studies — Inositol
Soto Jacome C et al. – The Journal of clinical endocrinology and metabolism (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41225692/
Zhang et al. - MI in IVF outcomes SR/MA (2025). [Systematic Review & Meta-Analysis (RCTs)]. https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2025.1520362/full
SOGC Position Statement - Inositol for PCOS (2025). [Clinical Position Statement (literature review to Oct 2024)]. https://sogc.org/
Palomba et al. - MI in reproductive management critical review (2025). [Critical Review]. https://www.sciencedirect.com/science/article/abs/pii/S1472648325004766
Akbari Sene et al. — Int J Reprod BioMed (2025). [Systematic review & MA of RCTs]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12413536/
SOGC Position Statement (2025). [Clinical guideline (SOGC)]. https://sogc.org
Zhang et al. — Front Endocrinol (2025). [Systematic review & MA]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11968372/
SOGC Position Statement — Inositol for PCOS (2025). [Clinical Position Statement]. https://sogc.org/
Akbari Sene et al. — PMC (2025). [Systematic review & MA (RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12413536/
Zhang et al. — Front Endocrinol (2025). [Systematic review & MA (RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11968372/
Inositol cardiometabolic MA — PMC (2025). [Systematic review & MA (GRADE-assessed)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12574088/
Gul M et al. – Naunyn-Schmiedeberg's archives of pharmacology (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/39847053/
Ozay OE et al. – Ginekologia polska (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/40665752/
Maddock RJ et al. – Molecular psychiatry (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40913113/
Fitz et al. - PCOS International Guidelines SR/MA (2024). [Systematic Review & Meta-Analysis (30 RCTs, n=2,230)]. https://pubmed.ncbi.nlm.nih.gov/38163998/
Fitz et al. — J Clin Endocrinol Metab (2024). [Systematic review & MA (30 RCTs, n=2230)]. https://pubmed.ncbi.nlm.nih.gov/38163998/
Fitz et al. — J Clin Endocrinol Metab (2024). [Systematic review & MA (PCOS Guidelines)]. https://pubmed.ncbi.nlm.nih.gov/38163998/
Li C et al. – Archives of gynecology and obstetrics (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37308791/
Chen H et al. – The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39115013/
Yavari M et al. – Expert review of endocrinology & metabolism (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38147023/
Razavi SA et al. – Cancer medicine (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38646957/
Motuhifonua SK et al. – The Cochrane database of systematic reviews (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36790138/
Fatima K et al. – Irish journal of medical science (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37148410/
Greff D et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37836508/
Jethaliya H et al. – Reproductive sciences (Thousand Oaks, Calif.) (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35477841/
Zhang JQ et al. – European review for medical and pharmacological sciences (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35363325/
Kachhawa G et al. – International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/34624138/
Li L et al. – European journal of obstetrics, gynecology, and reproductive biology (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35460931/
Liu Q et al. – Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35575290/
Wei J et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35889788/
Tang Q et al. – Medicine (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35475799/
Regidor et al. — Front Endocrinol (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33790860/
Zhao H et al. – Reproductive health (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34407851/
Azizi Kutenaei M et al. – European review for medical and pharmacological sciences (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33877679/
Chan KY et al. – Archives of gynecology and obstetrics (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33745021/
Facchinetti et al. — Gynecol Endocrinol (2020). [Expert consensus]. https://pubmed.ncbi.nlm.nih.gov/31553240/
Showell MG et al. – The Cochrane database of systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32851663/
Griffith RJ et al. – The Cochrane database of systematic reviews (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32526091/
Nordio M et al. – European review for medical and pharmacological sciences (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31298405/
Mendoza N et al. – Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/30880505/
Laganà AS et al. – Archives of gynecology and obstetrics (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30078122/
Unfer et al. - MI effects in PCOS women MA (2017). [Meta-Analysis (9 RCTs, n=496)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC5655679/
Unfer et al. — Eur Rev Med Pharmacol Sci (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28537652/
Nordio M et al. – European review for medical and pharmacological sciences (2017). [RCT]. https://pubmed.ncbi.nlm.nih.gov/28724185/
Mukai T et al. – Human psychopharmacology (2014). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/24424706/
Colazingari S et al. – Archives of gynecology and obstetrics (2013). [RCT]. https://pubmed.ncbi.nlm.nih.gov/23708322/
Nordio M et al. – European review for medical and pharmacological sciences (2012). [RCT]. https://pubmed.ncbi.nlm.nih.gov/22774396/
Papaleo E et al. – Fertility and sterility (2009). [RCT]. https://pubmed.ncbi.nlm.nih.gov/18462730/
Palatnik A et al. – Journal of clinical psychopharmacology (2001). [RCT]. https://pubmed.ncbi.nlm.nih.gov/11386498/
Benjamin J et al. – Journal of psychiatric research (1997). [RCT]. https://pubmed.ncbi.nlm.nih.gov/9352475/
The Benefits of Biotin
Bioactive Form
Biotin (Vitamin B7) is a water-soluble B vitamin that supports the maintenance of normal hair, skin, and mucous membranes. It plays an important role in macronutrient metabolism, helping the body convert fats, carbohydrates, and proteins into energy. While biotin deficiency is relatively rare in the general population, certain groups may benefit from supplementation.
Key Highlights
- Contributes to the maintenance of normal hair (EFSA approved)
- Supports the maintenance of normal skin (EFSA approved)
- Contributes to the maintenance of normal mucous membranes (EFSA approved)
- Supports normal energy-yielding metabolism (EFSA approved)
- Contributes to normal macronutrient metabolism (EFSA approved)
- Contributes to normal functioning of the nervous system (EFSA approved)
- Most beneficial for those with deficiency or at-risk groups
Biochemistry Timeline
Biotin is water-soluble, meaning the body does not store it in large amounts and regular intake is needed. Improvements in nail strength may take 3 to 6 months of consistent supplementation (research on brittle nails used 2,500-3,000 µg/day for several months; Patel et al., 2017).
For hair-related concerns, visible improvements also require patience, as the hair growth cycle means new growth takes several months to become noticeable. If biotin deficiency is confirmed, improvements in skin and energy may be noticed more quickly, within 4 to 8 weeks.
Nail Health
Biotin supplementation has shown the most consistent evidence for brittle nail syndrome. Case reports and small studies have demonstrated improvement in nail thickness and reduced splitting at doses of 2,500-3,000 µg/day (Patel et al., 2017).
While the evidence base is limited to smaller studies, the results have been consistently positive for those with brittle or splitting nails. Biotin supports keratin infrastructure, the structural protein that forms the foundation of both nails and hair.
Nervous System Function
Biotin contributes to the normal functioning of the nervous system, an EFSA-approved health claim. It is involved in the synthesis of myelin, the protective sheath around nerve fibres, and in neurotransmitter activity.
Biotin deficiency has been associated with neurological symptoms including depression, lethargy, and numbness in the extremities (Valizadeh & Valizadeh, 2011, documented neuropsychiatric symptoms as an early manifestation of B12 deficiency, with similar mechanisms relevant to biotin). Ensuring adequate biotin intake supports normal nervous system function as part of overall B vitamin sufficiency.
Summary
Biotin (Vitamin B7) supports the maintenance of normal hair, skin, mucous membranes, and nervous system function. It plays a key role in macronutrient metabolism, helping the body convert food into energy. While biotin deficiency is relatively rare, it is more common among pregnant women, those taking certain medications, and women experiencing hair loss.
We believe in being honest about the evidence: biotin supplementation is most beneficial for those with a deficiency or specific conditions like brittle nails. For those with adequate levels, other nutrients may be more impactful for hair and skin health. As part of a comprehensive supplement plan, biotin supports the body's metabolic and structural needs.
FAQs
Will biotin make my hair grow faster?
If you have a biotin deficiency, supplementation may improve hair health. However, research does not support biotin for hair growth in those with adequate levels. Hair concerns are often multifactorial, involving iron, zinc, vitamin D, and hormonal health. A comprehensive approach is more effective than relying on biotin alone.
How much biotin should I take?
The adequate intake for adults is 30-40 µg per day. Supplements commonly provide much higher doses (1,000-10,000 µg). For brittle nails, research has used 2,500-3,000 µg per day. There is no established upper limit, as toxicity is extremely rare.
Can biotin affect blood test results?
Yes, high-dose biotin supplementation can interfere with certain laboratory tests, including thyroid function tests and troponin (a heart marker). If you take high-dose biotin, inform your healthcare provider before any blood tests.
Are there any side effects?
Biotin is generally well-tolerated with no established upper limit. Side effects are extremely rare. Some people report mild skin breakouts when starting high-dose biotin, though this is not consistently documented in research.
Is biotin safe during pregnancy?
Yes, biotin is considered safe during pregnancy. In fact, biotin requirements may increase during pregnancy, and mild deficiency is relatively common in pregnant women. Consult your healthcare provider for appropriate dosage guidance.
Research
Gaffney PJ et al. – Multiple sclerosis and related disorders (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41124782/
Chai Y et al. – Asia Pacific journal of clinical nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39828265/
Zhu Y et al. – European journal of nutrition (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/41117955/
Cao AA et al. – Neuro-ophthalmology (Aeolus Press) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40190376/
Zaraa I et al. – Skin appendage disorders (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40176998/
Yelich et al. — PRISMA review (2024). [Systematic review (PRISMA)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11324195/
Ma G et al. – Microbiology spectrum (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38687069/
Gan Y et al. – Acta epileptologica (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/40217438/
Karachaliou CE et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38928282/
Lagzi N et al. – International journal of psychiatry in medicine (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/37256965/
Berger MM et al. – Clinical nutrition (Edinburgh, Scotland) (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35365361/
Dasgupta A – Advances in clinical chemistry (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35953126/
Zhang Y et al. – Frontiers in nutrition (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36386951/
Espiritu AI et al. – Multiple sclerosis and related disorders (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34332461/
Chessa MA et al. – Dermatology and therapy (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/31749091/
Cree BAC et al. – The Lancet. Neurology (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/33222767/
Almohanna et al. — Dermatol Ther (2019). [Comprehensive review].
Piraccini BM et al. – Giornale italiano di dermatologia e venereologia : organo ufficiale, Societa italiana di dermatologia e sifilografia (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31638351/
Chiavetta A et al. – Dermatologic therapy (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31344296/
Lipner — Cutis (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30372723/
Lipner SR et al. – The Journal of dermatological treatment (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29057689/
Tourbah A et al. – CNS drugs (2018). [RCT]. https://pubmed.ncbi.nlm.nih.gov/29808469/
Lipner SR — J Am Acad Dermatol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29709619/
Patel et al. — Skin Appendage Disord (2017). [Systematic review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC5582478/
Patel et al. — Skin Appendage Disord (2017). [Systematic review (18 cases)].
Patel et al. — Skin Appendage Disord (2017). [Systematic review (18 cases)]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Li et al. — FDA Safety Communication (2017). [Regulatory]. General
Patel DP et al. - Skin Appendage Disorders (2017). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Li D et al. - FDA Safety Communication (2017). [Safety Alert]. Safety
Mock DM - Journal of Nutrition (2017). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/28053236/
Patel DP et al. — Skin Appendage Disord (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Mock DM — J Nutr (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28490668/
Biotin lab interference — FDA warning (2017). [Safety notice]. https://www.fda.gov/safety/medwatch-safety-alerts-human-medical-products/biotin-may-interfere-lab-tests-fda-safety-communication
Elston MS et al. – The Journal of clinical endocrinology and metabolism (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27362288/
Tourbah A et al. – Multiple sclerosis (Houndmills, Basingstoke, England) (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/27589059/
Sedel F et al. — Mult Scler Relat Disord (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27063613/
Sedel et al. — Mult Scler Relat Disord (2015). [Pilot study]. https://pubmed.ncbi.nlm.nih.gov/25432947/
Sedel F et al. - Multiple Sclerosis and Related Disorders (2015). [Phase III RCT]. https://pubmed.ncbi.nlm.nih.gov/26590117/
EFSA NDA Panel — EFSA Journal (2014). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Lapik IA et al. – Voprosy pitaniia (2014). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25300112/
Li J & Wieringa FT — Asia Pac J Clin Nutr (2011). [Review].
Colombo et al. — Nutrients (2010). [Review]. General
Zempleni J et al. — Annu Rev Nutr (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19400697/
Albarracin CA et al. – Diabetes/metabolism research and reviews (2008). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17506119/
Scheinfeld N et al. – Journal of drugs in dermatology : JDD (2007). [Review]. https://pubmed.ncbi.nlm.nih.gov/17763607/
Albarracin C et al. – Journal of the cardiometabolic syndrome (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17684468/
Geohas J et al. – The American journal of the medical sciences (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17496732/
Bolander FF – Current opinion in investigational drugs (London, England : 2000) (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17086936/
Singer GM et al. – Diabetes technology & therapeutics (2006). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17109595/
Revilla-Monsalve C et al. – Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie (2006). [RCT]. https://pubmed.ncbi.nlm.nih.gov/16677798/
Scher RK et al. – Dermatology nursing (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12656000/
Biotin keratin mechanism — established (Established). [Established science].
Biotin pregnancy needs — established (Established). [Clinical observation].
53 studies — Biotin
Gaffney PJ et al. – Multiple sclerosis and related disorders (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41124782/
Chai Y et al. – Asia Pacific journal of clinical nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39828265/
Zhu Y et al. – European journal of nutrition (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/41117955/
Cao AA et al. – Neuro-ophthalmology (Aeolus Press) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40190376/
Zaraa I et al. – Skin appendage disorders (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40176998/
Yelich et al. — PRISMA review (2024). [Systematic review (PRISMA)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11324195/
Ma G et al. – Microbiology spectrum (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38687069/
Gan Y et al. – Acta epileptologica (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/40217438/
Karachaliou CE et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38928282/
Lagzi N et al. – International journal of psychiatry in medicine (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/37256965/
Berger MM et al. – Clinical nutrition (Edinburgh, Scotland) (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35365361/
Dasgupta A – Advances in clinical chemistry (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35953126/
Zhang Y et al. – Frontiers in nutrition (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36386951/
Espiritu AI et al. – Multiple sclerosis and related disorders (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34332461/
Chessa MA et al. – Dermatology and therapy (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/31749091/
Cree BAC et al. – The Lancet. Neurology (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/33222767/
Almohanna et al. — Dermatol Ther (2019). [Comprehensive review].
Piraccini BM et al. – Giornale italiano di dermatologia e venereologia : organo ufficiale, Societa italiana di dermatologia e sifilografia (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31638351/
Chiavetta A et al. – Dermatologic therapy (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31344296/
Lipner — Cutis (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30372723/
Lipner SR et al. – The Journal of dermatological treatment (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29057689/
Tourbah A et al. – CNS drugs (2018). [RCT]. https://pubmed.ncbi.nlm.nih.gov/29808469/
Lipner SR — J Am Acad Dermatol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29709619/
Patel et al. — Skin Appendage Disord (2017). [Systematic review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC5582478/
Patel et al. — Skin Appendage Disord (2017). [Systematic review (18 cases)].
Patel et al. — Skin Appendage Disord (2017). [Systematic review (18 cases)]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Li et al. — FDA Safety Communication (2017). [Regulatory]. General
Patel DP et al. - Skin Appendage Disorders (2017). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Li D et al. - FDA Safety Communication (2017). [Safety Alert]. Safety
Mock DM - Journal of Nutrition (2017). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/28053236/
Patel DP et al. — Skin Appendage Disord (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Mock DM — J Nutr (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28490668/
Biotin lab interference — FDA warning (2017). [Safety notice]. https://www.fda.gov/safety/medwatch-safety-alerts-human-medical-products/biotin-may-interfere-lab-tests-fda-safety-communication
Elston MS et al. – The Journal of clinical endocrinology and metabolism (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27362288/
Tourbah A et al. – Multiple sclerosis (Houndmills, Basingstoke, England) (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/27589059/
Sedel F et al. — Mult Scler Relat Disord (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27063613/
Sedel et al. — Mult Scler Relat Disord (2015). [Pilot study]. https://pubmed.ncbi.nlm.nih.gov/25432947/
Sedel F et al. - Multiple Sclerosis and Related Disorders (2015). [Phase III RCT]. https://pubmed.ncbi.nlm.nih.gov/26590117/
EFSA NDA Panel — EFSA Journal (2014). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Lapik IA et al. – Voprosy pitaniia (2014). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25300112/
Li J & Wieringa FT — Asia Pac J Clin Nutr (2011). [Review].
Colombo et al. — Nutrients (2010). [Review]. General
Zempleni J et al. — Annu Rev Nutr (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19400697/
Albarracin CA et al. – Diabetes/metabolism research and reviews (2008). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17506119/
Scheinfeld N et al. – Journal of drugs in dermatology : JDD (2007). [Review]. https://pubmed.ncbi.nlm.nih.gov/17763607/
Albarracin C et al. – Journal of the cardiometabolic syndrome (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17684468/
Geohas J et al. – The American journal of the medical sciences (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17496732/
Bolander FF – Current opinion in investigational drugs (London, England : 2000) (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17086936/
Singer GM et al. – Diabetes technology & therapeutics (2006). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17109595/
Revilla-Monsalve C et al. – Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie (2006). [RCT]. https://pubmed.ncbi.nlm.nih.gov/16677798/
Scher RK et al. – Dermatology nursing (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12656000/
Biotin keratin mechanism — established (Established). [Established science].
Biotin pregnancy needs — established (Established). [Clinical observation].
The Benefits of Zinc
Bioavailable Form
Zinc Glycinate is a chelated form of zinc bound to the amino acid glycine. This chelation enhances absorption and makes it gentler on the stomach compared to other zinc forms. It supports immune defence, skin health, hormonal balance, and the maintenance of normal hair and nails.
Key Highlights
- Chelated form: zinc bound to glycine for enhanced absorption
- Gentler on the stomach than zinc sulfate or oxide
- Supports immune function, skin, hair, nails, and fertility (EFSA approved)
- Glycine component adds calming amino acid benefit
- See our main Zinc page for detailed research and EFSA claims
Biochemistry Timeline
Zinc glycinate is highly bioavailable and gentle on digestion. Benefits begin within 2-4 weeks. See our main Zinc page for detailed information.
Summary
Zinc Glycinate offers enhanced absorption and digestive comfort through chelation with glycine. See our main Zinc page for comprehensive research, EFSA claims, and detailed information.
FAQs
What is zinc glycinate?
Zinc glycinate is zinc bound to the amino acid glycine. This chelated form is designed for enhanced absorption and is typically very gentle on the stomach, making it suitable for people with sensitive digestion.
Is zinc glycinate better absorbed than other forms?
Chelated zinc forms like glycinate generally show good bioavailability. The glycine molecule helps protect zinc during digestion, potentially allowing more to be absorbed compared to non-chelated forms.
How much zinc should I take daily?
The recommended daily intake for adults in Europe is 7 to 11 mg, depending on dietary phytate intake. The European tolerable upper intake level is 25 mg per day for adults.
Research
Amanzholkyzy A et al. – Georgian medical news (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41687657/
Camilleri M – Alimentary pharmacology & therapeutics (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40515459/
Agare GI et al. – Clinical nutrition ESPEN (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40015604/
Stanescu C et al. – Molecules (Basel, Switzerland) (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40942093/
Ferrara G et al. – Nefrologia (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39986711/
Jha N et al. – Nutrients (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40292568/
PMC11626374 — Zinc and androgenic pathways (2024). [Mechanistic review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11626374/
Ayhan et al. — J Cosmet Dermatol (2024). [Cross-sectional]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11626366/
Nault D et al. - Cochrane Database of Systematic Reviews (2024). [Cochrane Review Update]. https://pubmed.ncbi.nlm.nih.gov/38719213/
Hsu TJ et al. – Nutrients (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39683510/
Kapper C et al. – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39683462/
Cui Y et al. – COPD (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38591165/
Langer G et al. – The Cochrane database of systematic reviews (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38345088/
Chao et al. — Nutrients (2023). [Meta-analysis (15 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/37299574/
Andersen CT et al. – BMJ global health (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36849195/
Shields A et al. – JAMA dermatology (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37878272/
Zafar MI et al. – Drugs (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36943634/
García-Rodríguez MT et al. – Advances in skin & wound care (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36537775/
Maxfield L & Crane JS — StatPearls (2023). [Textbook review]. https://pubmed.ncbi.nlm.nih.gov/29630283/
Wang L & Song Y - Frontiers in Nutrition (2022). [Umbrella Meta-Analysis]. https://www.frontiersin.org/articles/10.3389/fnut.2022.798078/
Bomer N et al. – Journal of internal medicine (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35137472/
Tyrmi JS et al. – Human reproduction (Oxford, England) (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34791234/
Yosaee S et al. – General hospital psychiatry (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32829928/
Sadeghsoltani F et al. — Biol Trace Elem Res (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/34081300/
Hendricks AJ et al. – The Journal of dermatological treatment (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31106609/
Dalhoff A – Infection (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33367978/
Camilleri M – Current opinion in clinical nutrition and metabolic care (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34138767/
Shi C et al. – The Cochrane database of systematic reviews (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34308565/
Taghipour A et al. – Biological trace element research (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33405078/
Saeg F et al. – Plastic and reconstructive surgery (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/34181622/
Neta FI et al. – Current research in pharmacology and drug discovery (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34870148/
Dhaliwal et al. — J Drugs Dermatol (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31745908/
Liu H et al. – The Cochrane database of systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32356369/
Garolla A et al. – Nutrients (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32438678/
Liu H et al. – Journal of evidence-based medicine (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33034949/
Calder PC et al. – Nutrients (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32340216/
Yee BE et al. – Dermatologic therapy (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32860489/
Pearsey HM et al. – Reviews in endocrine & metabolic disorders (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32377863/
Song YP et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32166790/
Moore ZE et al. – The Cochrane database of systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32677037/
Eaton JC et al. – The Cochrane database of systematic reviews (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30779870/
Doty RL – Handbook of clinical neurology (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31604562/
Read SA et al. — Adv Nutr (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31305906/
Ogawa Y et al. — Nutrients (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29439479/
Hemilä — Open Forum Infect Dis (2017). [Meta-analysis (7 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/28480298/
Wessels I et al. - Nutrients (2017). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/29186856/
Hemilä H - JRSM Open (2017). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/28515951/
Irani M et al. – Urology journal (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28853101/
Block E et al. – Natural product reports (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28471462/
Finch CW – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25527182/
Michielan A et al. – Mediators of inflammation (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26582965/
Wieringa FT et al. — PLoS One (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25880209/
Gupta M et al. — Dermatol Res Pract (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25120566/
Singh M & Das RR - Cochrane Database of Systematic Reviews (2013). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/23775705/
Prasad AS — Adv Nutr (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/23493540/
Maret W — Adv Nutr (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/23858094/
Wessells & Brown — PLoS One (2012). [Meta-analysis of national surveys]. https://pubmed.ncbi.nlm.nih.gov/22217001/
Schagen SK et al. - Dermato-Endocrinology (2012). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/23467449/
Rao G & Rowland K — J Fam Pract (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/21540986/
Hemila H — Open Respir Med J (2011). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21769305/
Saper RB & Rash R — Am Fam Physician (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19678340/
Haase H & Rink L — Annu Rev Nutr (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19575597/
Brown KH et al. — Food Nutr Bull (2009). [Expert review]. https://pubmed.ncbi.nlm.nih.gov/19472167/
Prasad — Mol Med (2008). [Review]. https://pubmed.ncbi.nlm.nih.gov/18587293/
Prasad AS - Molecular Medicine (2008). [Clinical Review]. https://pubmed.ncbi.nlm.nih.gov/18587227/
Solfrizzi V et al. – Journal of Alzheimer's disease : JAD (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17119295/
Hughes S et al. – Journal of the American College of Nutrition (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/16943449/
Maret W & Sandstead HH — J Trace Elem Med Biol (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17084463/
Mathus-Vliegen EM – The journals of gerontology. Series A, Biological sciences and medical sciences (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15071079/
Morselli B et al. – Therapeutische Umschau. Revue therapeutique (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10756695/
Zima T et al. – Blood purification (1999). [Review]. https://pubmed.ncbi.nlm.nih.gov/10494021/
Ackerman BH et al. – Pharmacotherapy (1997). [Review]. https://pubmed.ncbi.nlm.nih.gov/9165552/
Gramm HJ et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (1995). [Review]. https://pubmed.ncbi.nlm.nih.gov/8846151/
Clarkson PM – Journal of sports sciences (1991). [Review]. https://pubmed.ncbi.nlm.nih.gov/1895366/
Askari A et al. – JPEN. Journal of parenteral and enteral nutrition (1980). [Review]. https://pubmed.ncbi.nlm.nih.gov/6780709/
Zinc deficiency and immunity — established (Established). [Biochemical mechanism]. General
76 studies — Zinc
Amanzholkyzy A et al. – Georgian medical news (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41687657/
Camilleri M – Alimentary pharmacology & therapeutics (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40515459/
Agare GI et al. – Clinical nutrition ESPEN (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40015604/
Stanescu C et al. – Molecules (Basel, Switzerland) (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40942093/
Ferrara G et al. – Nefrologia (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39986711/
Jha N et al. – Nutrients (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40292568/
PMC11626374 — Zinc and androgenic pathways (2024). [Mechanistic review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11626374/
Ayhan et al. — J Cosmet Dermatol (2024). [Cross-sectional]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11626366/
Nault D et al. - Cochrane Database of Systematic Reviews (2024). [Cochrane Review Update]. https://pubmed.ncbi.nlm.nih.gov/38719213/
Hsu TJ et al. – Nutrients (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39683510/
Kapper C et al. – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39683462/
Cui Y et al. – COPD (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38591165/
Langer G et al. – The Cochrane database of systematic reviews (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38345088/
Chao et al. — Nutrients (2023). [Meta-analysis (15 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/37299574/
Andersen CT et al. – BMJ global health (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36849195/
Shields A et al. – JAMA dermatology (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37878272/
Zafar MI et al. – Drugs (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36943634/
García-Rodríguez MT et al. – Advances in skin & wound care (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36537775/
Maxfield L & Crane JS — StatPearls (2023). [Textbook review]. https://pubmed.ncbi.nlm.nih.gov/29630283/
Wang L & Song Y - Frontiers in Nutrition (2022). [Umbrella Meta-Analysis]. https://www.frontiersin.org/articles/10.3389/fnut.2022.798078/
Bomer N et al. – Journal of internal medicine (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35137472/
Tyrmi JS et al. – Human reproduction (Oxford, England) (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34791234/
Yosaee S et al. – General hospital psychiatry (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32829928/
Sadeghsoltani F et al. — Biol Trace Elem Res (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/34081300/
Hendricks AJ et al. – The Journal of dermatological treatment (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31106609/
Dalhoff A – Infection (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33367978/
Camilleri M – Current opinion in clinical nutrition and metabolic care (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34138767/
Shi C et al. – The Cochrane database of systematic reviews (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34308565/
Taghipour A et al. – Biological trace element research (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33405078/
Saeg F et al. – Plastic and reconstructive surgery (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/34181622/
Neta FI et al. – Current research in pharmacology and drug discovery (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34870148/
Dhaliwal et al. — J Drugs Dermatol (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31745908/
Liu H et al. – The Cochrane database of systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32356369/
Garolla A et al. – Nutrients (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32438678/
Liu H et al. – Journal of evidence-based medicine (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33034949/
Calder PC et al. – Nutrients (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32340216/
Yee BE et al. – Dermatologic therapy (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32860489/
Pearsey HM et al. – Reviews in endocrine & metabolic disorders (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32377863/
Song YP et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32166790/
Moore ZE et al. – The Cochrane database of systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32677037/
Eaton JC et al. – The Cochrane database of systematic reviews (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30779870/
Doty RL – Handbook of clinical neurology (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31604562/
Read SA et al. — Adv Nutr (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31305906/
Ogawa Y et al. — Nutrients (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29439479/
Hemilä — Open Forum Infect Dis (2017). [Meta-analysis (7 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/28480298/
Wessels I et al. - Nutrients (2017). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/29186856/
Hemilä H - JRSM Open (2017). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/28515951/
Irani M et al. – Urology journal (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28853101/
Block E et al. – Natural product reports (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28471462/
Finch CW – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25527182/
Michielan A et al. – Mediators of inflammation (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26582965/
Wieringa FT et al. — PLoS One (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25880209/
Gupta M et al. — Dermatol Res Pract (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25120566/
Singh M & Das RR - Cochrane Database of Systematic Reviews (2013). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/23775705/
Prasad AS — Adv Nutr (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/23493540/
Maret W — Adv Nutr (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/23858094/
Wessells & Brown — PLoS One (2012). [Meta-analysis of national surveys]. https://pubmed.ncbi.nlm.nih.gov/22217001/
Schagen SK et al. - Dermato-Endocrinology (2012). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/23467449/
Rao G & Rowland K — J Fam Pract (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/21540986/
Hemila H — Open Respir Med J (2011). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21769305/
Saper RB & Rash R — Am Fam Physician (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19678340/
Haase H & Rink L — Annu Rev Nutr (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19575597/
Brown KH et al. — Food Nutr Bull (2009). [Expert review]. https://pubmed.ncbi.nlm.nih.gov/19472167/
Prasad — Mol Med (2008). [Review]. https://pubmed.ncbi.nlm.nih.gov/18587293/
Prasad AS - Molecular Medicine (2008). [Clinical Review]. https://pubmed.ncbi.nlm.nih.gov/18587227/
Solfrizzi V et al. – Journal of Alzheimer's disease : JAD (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17119295/
Hughes S et al. – Journal of the American College of Nutrition (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/16943449/
Maret W & Sandstead HH — J Trace Elem Med Biol (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17084463/
Mathus-Vliegen EM – The journals of gerontology. Series A, Biological sciences and medical sciences (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15071079/
Morselli B et al. – Therapeutische Umschau. Revue therapeutique (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10756695/
Zima T et al. – Blood purification (1999). [Review]. https://pubmed.ncbi.nlm.nih.gov/10494021/
Ackerman BH et al. – Pharmacotherapy (1997). [Review]. https://pubmed.ncbi.nlm.nih.gov/9165552/
Gramm HJ et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (1995). [Review]. https://pubmed.ncbi.nlm.nih.gov/8846151/
Clarkson PM – Journal of sports sciences (1991). [Review]. https://pubmed.ncbi.nlm.nih.gov/1895366/
Askari A et al. – JPEN. Journal of parenteral and enteral nutrition (1980). [Review]. https://pubmed.ncbi.nlm.nih.gov/6780709/
Zinc deficiency and immunity — established (Established). [Biochemical mechanism]. General
The Benefits of Copper (Glycinate)
Chelated form
Copper is an essential trace mineral involved in energy production, connective tissue formation, iron metabolism, and nervous system function. It also contributes to normal hair and skin pigmentation. The body needs copper in very small amounts, but its roles are critical, particularly in supporting iron transport, immune function, and antioxidant defence.
Key Highlights
- Contributes to normal iron transport in the body (EFSA approved)
- Supports normal hair and skin pigmentation (EFSA approved)
- Contributes to maintenance of normal connective tissues (EFSA approved)
- Supports normal energy-yielding metabolism (EFSA approved)
- Contributes to normal functioning of the nervous system (EFSA approved)
- Supports normal function of the immune system (EFSA approved)
- Contributes to protection of cells from oxidative stress (EFSA approved)
Biochemistry Timeline
Copper supplements are well-absorbed, particularly in glycinate form. Blood levels respond within 2 to 4 weeks. Copper has a narrow optimal range (both deficiency and excess are harmful), so supplementation should be at appropriate doses, typically 1-2 mg/day.
Energy Production
Copper is a component of cytochrome c oxidase, the final enzyme in the mitochondrial electron transport chain. This makes copper directly involved in the last step of cellular energy (ATP) production. EFSA recognises that copper contributes to normal energy-yielding metabolism.
Immune and Antioxidant Function
Copper supports immune function and acts as a cofactor for superoxide dismutase (SOD), one of the body's most important antioxidant enzymes. SOD neutralises superoxide radicals, protecting cells from oxidative damage. EFSA recognises that copper contributes to normal immune function and protection of cells from oxidative stress.
Summary
Copper is an essential trace mineral with critical roles in iron transport, energy production, connective tissue maintenance, hair/skin pigmentation, immune function, and antioxidant defence. We use copper glycinate for optimal absorption. Copper works alongside iron, zinc, and other trace minerals to support overall health, with EFSA recognising multiple health claims.
FAQs
How much copper do I need?
The recommended daily intake for adults is 1 mg. The European upper limit is 5 mg per day. Most supplements provide 1-2 mg per day.
Why is copper paired with zinc?
High-dose zinc supplementation can reduce copper absorption over time. When taking zinc supplements long-term, including a small amount of copper helps maintain balance.
Is copper safe during pregnancy?
Copper is essential during pregnancy. Recommended intake is slightly higher. Follow your healthcare provider's guidance.
Research
NIH ODS — Copper Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Copper-HealthProfessional/
Hill B et al. – British journal of nursing (Mark Allen Publishing) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39969834/
Mao L et al. – Chemical Society reviews (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40433941/
Stiles LI et al. – Clinical and experimental medicine (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38367035/
Liu WQ et al. – Immunological reviews (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37715546/
Podgórska A et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38612631/
Diao W et al. – Wound repair and regeneration : official publication of the Wound Healing Society [and] the European Tissue Repair Society (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37822053/
Teschke R et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38731973/
Fujiwara T – [Rinsho ketsueki] The Japanese journal of clinical hematology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39358290/
Lopes SO et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36904074/
Helman SL et al. – Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/35167013/
Gogna S et al. – Journal of the American Nutrition Association (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/35916491/
Kiani AK et al. – Journal of preventive medicine and hygiene (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36479498/
Sandoval C et al. – Pharmaceutics (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36145586/
Salvo J et al. – Burns & trauma (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35071652/
Piroddi et al. — Nutrients (2021). [Narrative review]. https://pubmed.ncbi.nlm.nih.gov/34210051/
Cucci LM et al. – International journal of molecular sciences (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34639045/
Gombart AF et al. – Nutrients (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/31963293/
Fujiwara T – [Rinsho ketsueki] The Japanese journal of clinical hematology (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32759564/
Myint ZW et al. – Annals of hematology (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29959467/
Bost et al. — J Trace Elements Med Biol (review) (2016). [Narrative review]. PubMed Review
Bost et al. — J Trace Elem Med Biol (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27473827/
Bost M et al. - Journal of Trace Elements in Medicine and Biology (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27473827/
EFSA Panel — NDA Opinion (2015). [Regulatory / Scientific Opinion]. EFSA Register
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Pickart L et al. – BioMed research international (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26236730/
Gaetke LM et al. - Journal of Clinical and Experimental Hepatology (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25755573/
Prohaska — Adv Nutr (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/22332098/
Collins et al. — Br J Nutr (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20500926/
Collins JF et al. - Advances in Nutrition (2010). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/22043417/
Stern BR et al. - Journal of Toxicology and Environmental Health (2007). [Risk Assessment]. https://pubmed.ncbi.nlm.nih.gov/17454560/
Harvey & Baker — Br J Nutr (2005). [RCT (crossover)]. https://pubmed.ncbi.nlm.nih.gov/16115357/
Harvey LJ et al. - American Journal of Clinical Nutrition (2005). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/15883444/
Turnlund et al. — Am J Clin Nutr (2004). [Controlled study]. https://pubmed.ncbi.nlm.nih.gov/15113722/
Black RE – The British journal of nutrition (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11509110/
Albrektsson T et al. – European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11716023/
Olivares M & Uauy R - American Journal of Clinical Nutrition (1996). [Review]. https://pubmed.ncbi.nlm.nih.gov/8610072/
May A et al. – Bailliere's clinical haematology (1994). [Review]. https://pubmed.ncbi.nlm.nih.gov/7881157/
Oski FA – Seminars in perinatology (1979). [Review]. https://pubmed.ncbi.nlm.nih.gov/395648/
39 studies — Copper (Glycinate)
NIH ODS — Copper Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Copper-HealthProfessional/
Hill B et al. – British journal of nursing (Mark Allen Publishing) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39969834/
Mao L et al. – Chemical Society reviews (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40433941/
Stiles LI et al. – Clinical and experimental medicine (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38367035/
Liu WQ et al. – Immunological reviews (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37715546/
Podgórska A et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38612631/
Diao W et al. – Wound repair and regeneration : official publication of the Wound Healing Society [and] the European Tissue Repair Society (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37822053/
Teschke R et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38731973/
Fujiwara T – [Rinsho ketsueki] The Japanese journal of clinical hematology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39358290/
Lopes SO et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36904074/
Helman SL et al. – Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/35167013/
Gogna S et al. – Journal of the American Nutrition Association (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/35916491/
Kiani AK et al. – Journal of preventive medicine and hygiene (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36479498/
Sandoval C et al. – Pharmaceutics (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36145586/
Salvo J et al. – Burns & trauma (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35071652/
Piroddi et al. — Nutrients (2021). [Narrative review]. https://pubmed.ncbi.nlm.nih.gov/34210051/
Cucci LM et al. – International journal of molecular sciences (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34639045/
Gombart AF et al. – Nutrients (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/31963293/
Fujiwara T – [Rinsho ketsueki] The Japanese journal of clinical hematology (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32759564/
Myint ZW et al. – Annals of hematology (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29959467/
Bost et al. — J Trace Elements Med Biol (review) (2016). [Narrative review]. PubMed Review
Bost et al. — J Trace Elem Med Biol (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27473827/
Bost M et al. - Journal of Trace Elements in Medicine and Biology (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27473827/
EFSA Panel — NDA Opinion (2015). [Regulatory / Scientific Opinion]. EFSA Register
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Pickart L et al. – BioMed research international (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26236730/
Gaetke LM et al. - Journal of Clinical and Experimental Hepatology (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25755573/
Prohaska — Adv Nutr (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/22332098/
Collins et al. — Br J Nutr (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20500926/
Collins JF et al. - Advances in Nutrition (2010). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/22043417/
Stern BR et al. - Journal of Toxicology and Environmental Health (2007). [Risk Assessment]. https://pubmed.ncbi.nlm.nih.gov/17454560/
Harvey & Baker — Br J Nutr (2005). [RCT (crossover)]. https://pubmed.ncbi.nlm.nih.gov/16115357/
Harvey LJ et al. - American Journal of Clinical Nutrition (2005). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/15883444/
Turnlund et al. — Am J Clin Nutr (2004). [Controlled study]. https://pubmed.ncbi.nlm.nih.gov/15113722/
Black RE – The British journal of nutrition (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11509110/
Albrektsson T et al. – European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11716023/
Olivares M & Uauy R - American Journal of Clinical Nutrition (1996). [Review]. https://pubmed.ncbi.nlm.nih.gov/8610072/
May A et al. – Bailliere's clinical haematology (1994). [Review]. https://pubmed.ncbi.nlm.nih.gov/7881157/
Oski FA – Seminars in perinatology (1979). [Review]. https://pubmed.ncbi.nlm.nih.gov/395648/
The Benefits of Selenium
Natural form
Selenium is an essential trace mineral with powerful antioxidant properties. It plays a vital role in thyroid health, immune function, and protecting cells from oxidative damage. The thyroid gland contains more selenium per gram of tissue than any other organ in the body, reflecting how important this mineral is for hormonal balance.
Key Highlights
- Contributes to normal thyroid function (EFSA approved)
- Supports the protection of cells from oxidative stress (EFSA approved)
- Contributes to normal function of the immune system (EFSA approved)
- Supports maintenance of normal hair and nails (EFSA approved)
- Contributes to normal spermatogenesis (EFSA approved)
- Thyroid gland contains more selenium per gram than any other organ
Biochemistry Timeline
Selenium supplementation can begin to influence selenoprotein activity within 2 to 4 weeks. For thyroid-related benefits, research suggests consistent supplementation for at least 3 months to see meaningful changes in thyroid antibody levels.
Selenium has a relatively narrow optimal range. The EFSA upper limit is 255 µg per day, and most supplements provide 55-200 µg per day. Blood selenium levels can be measured to assess status and guide appropriate supplementation.
Hair and Nail Health
Selenium contributes to the maintenance of normal hair and nails, an EFSA-approved health claim. Hair follicles and nail beds require adequate selenium for healthy growth, and deficiency has been associated with hair thinning and brittle nails.
Because thyroid health also directly affects hair and nail quality, selenium's dual role in supporting thyroid function and providing antioxidant protection makes it particularly valuable for those experiencing hair or nail concerns, especially when thyroid function may be a contributing factor.
Reproductive Health
Selenium plays a role in reproductive health for both women and men. EFSA recognises that selenium contributes to normal spermatogenesis (sperm production). For women, selenium's role in thyroid health is particularly relevant, as thyroid function is closely linked to menstrual regularity and fertility.
Adequate selenium status supports the hormonal balance and antioxidant protection that are important throughout the reproductive years and during pregnancy. If you are planning a pregnancy, ensuring adequate selenium intake, alongside other key nutrients, is a thoughtful step in preparation.
Summary
Selenium is an essential trace mineral that supports thyroid health, immune function, antioxidant protection, and the maintenance of healthy hair and nails. The thyroid gland relies heavily on selenium for hormone conversion, making it especially relevant for the many women affected by autoimmune thyroid conditions.
Found in foods like Brazil nuts, fish, and eggs, selenium intake can vary depending on regional soil levels. Supplementation at appropriate doses (typically 55-200 µg/day) offers a reliable way to maintain adequate selenium status, with benefits for thyroid antibody levels typically seen within 3 months of consistent use.
FAQs
How much selenium do I need?
The recommended intake for adults is 55-70 µg per day. The European upper limit is 255 µg per day. Supplementation typically provides 55-200 µg per day, depending on your dietary intake and health goals.
Can I get enough selenium from Brazil nuts alone?
Brazil nuts are the richest natural source of selenium, with just 1-2 nuts potentially providing your daily needs. However, selenium content varies significantly between nuts depending on the soil where they were grown, so relying solely on Brazil nuts can result in inconsistent intake.
Is selenium helpful for thyroid conditions?
Research supports selenium supplementation for autoimmune thyroid conditions, particularly Hashimoto's thyroiditis, where it has been shown to reduce thyroid antibodies. If you have a thyroid condition, discuss selenium supplementation with your healthcare provider as part of your overall management plan.
Are there risks of taking too much selenium?
Yes, selenium has a relatively narrow range between adequacy and excess. Symptoms of excess selenium (selenosis) can include garlic breath, hair loss, and nail changes. Staying within recommended supplementation levels and the EFSA upper limit of 255 µg/day is important.
Is selenium safe during pregnancy?
Selenium is considered safe during pregnancy at recommended doses. Adequate selenium supports thyroid function and antioxidant protection for both mother and baby. Consult your healthcare provider for personalised guidance.
Research
Kyriakou SI et al. – International journal of molecular sciences (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41596613/
NIH ODS — Selenium Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/
Natarelli N et al. – Journal of medicinal food (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39804624/
Chen J et al. – Toxicology letters (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40829714/
Dorczok MC et al. – Nutrients (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39940333/
Bjørklund G et al. – Current medicinal chemistry (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40045862/
Bjørklund G et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40460725/
Zhang H et al. – Medicine (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40898469/
Huwiler et al. — Thyroid (2024). [SR + meta-analysis (35 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC10951571/
Selenoprotein review — immune function (2024). [Narrative review]. General
Huwiler et al. — Thyroid (2024). [Systematic review & MA (35 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC10951571/
Huwiler VV et al. – Thyroid : official journal of the American Thyroid Association (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38243784/
Norouzi M et al. – Nutrition and cancer (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38105612/
Peng B et al. – Frontiers in endocrinology (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39698034/
Gholizadeh M et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37257335/
Zhao J et al. – BMC endocrine disorders (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36740666/
Wang YS et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37513612/
Silva I et al. – The British journal of nutrition (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36408672/
Kong XQ et al. – Medicine (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37335715/
Fan Y et al. — Biol Trace Elem Res (2023). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36066765/
Lin Y et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35267927/
Sharma AP et al. – Urology (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34871624/
Pereira ME et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35956381/
Barchielli G et al. — Antioxidants (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35624695/
Schomburg L — Nat Rev Endocrinol (2022). [Expert review]. https://pubmed.ncbi.nlm.nih.gov/34880437/
Zuo Y et al. – Annals of palliative medicine (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33894732/
Parohan M et al. – Nutritional neuroscience (2021). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31241007/
Santos LR et al. — Nutrients (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33671141/
Winther et al. — Environ Int (2020). [Cross-sectional]. General
Kuria A et al. - BMC Endocrine Disorders (2020). [Cochrane-style SR]. https://pubmed.ncbi.nlm.nih.gov/33372610/
Zhao XH et al. – Asian journal of psychiatry (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32927309/
Bohnet HG – Therapeutic drug monitoring (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31425445/
Zhang Y et al. – Human reproduction update (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32045470/
Kim DY et al. – Journal of translational medicine (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31906979/
Lv J et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32497930/
Jayawardena R et al. – Diabetes & metabolic syndrome (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32334392/
Winther KH et al. — Endocr Rev (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32009168/
Buhling K et al. – Reproductive biomedicine online (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31160241/
Zhang X et al. – Medicine (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31192915/
Almohanna HM et al. – Dermatology and therapy (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30547302/
Varikasuvu SR et al. – Biological trace element research (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30171594/
Sayehmiri K et al. – Asian Pacific journal of cancer prevention : APJCP (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29936712/
Salas-Huetos A et al. – Advances in nutrition (Bethesda, Md.) (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30462179/
Vinceti M et al. – The Cochrane database of systematic reviews (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29376219/
Yu V et al. – Skin appendage disorders (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30410891/
Vinceti M et al. — Cochrane Database Syst Rev (2018). [Cochrane review]. https://pubmed.ncbi.nlm.nih.gov/29376219/
Showell MG et al. – The Cochrane database of systematic reviews (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28752910/
Salas-Huetos A et al. – Human reproduction update (2017). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/28333357/
Thompson JM et al. – American journal of clinical dermatology (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28508256/
Kieliszek M & Blazejak S — Molecules (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27043534/
Autoimmune thyroid sex difference review (2015). [Review / Hypothesis]. https://pubmed.ncbi.nlm.nih.gov/25576242/
Stoffaneller & Morse — Nutrients (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25988760/
Winther KH et al. - European Journal of Endocrinology (2015). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/26444987/
Duntas LH & Benvenga S — Endocrine (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25869537/
Stoffaneller R & Morse NL — Nutrients (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25835046/
Steinbrenner H et al. — Adv Nutr (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25568042/
Wu Q et al. — J Biol Chem (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25957410/
Rayman MP & Stranges S — Free Radic Biol Med (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/23395779/
Rayman — Lancet (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22381456/
Rayman MP — Lancet (2012). [Seminar]. https://pubmed.ncbi.nlm.nih.gov/22381456/
Toulis et al. — Thyroid (2010). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/20883174/
Hurst et al. — Am J Clin Nutr (2010). [RCT (dose-response)]. https://pubmed.ncbi.nlm.nih.gov/20357044/
Daniells S et al. – Current opinion in clinical nutrition and metabolic care (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20823774/
Lippman SM et al. - JAMA (SELECT) (2009). [Landmark RCT]. https://pubmed.ncbi.nlm.nih.gov/19066370/
Bleys J et al. — Arch Intern Med (2008). [Prospective cohort]. https://pubmed.ncbi.nlm.nih.gov/18347289/
65 studies — Selenium
Kyriakou SI et al. – International journal of molecular sciences (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41596613/
NIH ODS — Selenium Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/
Natarelli N et al. – Journal of medicinal food (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39804624/
Chen J et al. – Toxicology letters (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40829714/
Dorczok MC et al. – Nutrients (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39940333/
Bjørklund G et al. – Current medicinal chemistry (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40045862/
Bjørklund G et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40460725/
Zhang H et al. – Medicine (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40898469/
Huwiler et al. — Thyroid (2024). [SR + meta-analysis (35 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC10951571/
Selenoprotein review — immune function (2024). [Narrative review]. General
Huwiler et al. — Thyroid (2024). [Systematic review & MA (35 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC10951571/
Huwiler VV et al. – Thyroid : official journal of the American Thyroid Association (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38243784/
Norouzi M et al. – Nutrition and cancer (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38105612/
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Gholizadeh M et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37257335/
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Wang YS et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37513612/
Silva I et al. – The British journal of nutrition (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36408672/
Kong XQ et al. – Medicine (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37335715/
Fan Y et al. — Biol Trace Elem Res (2023). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36066765/
Lin Y et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35267927/
Sharma AP et al. – Urology (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34871624/
Pereira ME et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35956381/
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Zuo Y et al. – Annals of palliative medicine (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33894732/
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Zhang Y et al. – Human reproduction update (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32045470/
Kim DY et al. – Journal of translational medicine (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31906979/
Lv J et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32497930/
Jayawardena R et al. – Diabetes & metabolic syndrome (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32334392/
Winther KH et al. — Endocr Rev (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32009168/
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Varikasuvu SR et al. – Biological trace element research (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30171594/
Sayehmiri K et al. – Asian Pacific journal of cancer prevention : APJCP (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29936712/
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The Benefits of Vegan Collagen Blend
Natural Blend
Our Vegan Collagen Blend provides the key amino acids and nutrients the body needs to support its own collagen production, without using animal-derived collagen. It includes vitamin C (essential for collagen synthesis), along with plant-based amino acids and supporting nutrients that provide the building blocks for the body's natural collagen formation.
Key Highlights
- Plant-based alternative to animal-derived collagen
- Provides building blocks for the body's own collagen production
- Vitamin C supports normal collagen formation (EFSA approved)
- Includes zinc for normal protein synthesis (EFSA approved)
- Suitable for vegan and vegetarian lifestyles
- Supports skin, connective tissue, and structural health
Biochemistry Timeline
Supporting the body's own collagen production takes time. Expect 8-12 weeks of consistent use before noticing improvements in skin hydration and texture. Results depend on overall nutrition, age, and individual factors.
Summary
Our Vegan Collagen Blend takes a different approach: rather than providing pre-formed animal collagen, it supplies the amino acids, vitamin C, zinc, and other nutrients the body needs to produce its own collagen. It is an honest, plant-based option for supporting skin, connective tissue, and structural health.
FAQs
Is vegan collagen as effective as marine collagen?
They work differently. Marine collagen provides pre-formed collagen peptides. Vegan blends provide the building blocks for your own collagen production. Both approaches support skin health, though they do so through different mechanisms. Marine collagen has more direct clinical evidence for skin hydration.
Research
Ortiz-Hernández GD, Claudio-Rizo JA, González-Morales S et al. (2026). Sustainable collagen-xanthan gum hydrogel scaffolds with super-swelling behavior and biostimulatory activity for agricultural applications. Int J Biol Macromol. https://pubmed.ncbi.nlm.nih.gov/41865925/
Abdel-Sattar OE, El-Shiekh RA, Sabry MM et al. (2026). Zeinoside B, a pregnane glycoside from Caralluma adenensis (Defler) A. Berger, accelerates excisional wound healing in mice through antioxidant and reparative mechanisms. J Ethnopharmacol. https://pubmed.ncbi.nlm.nih.gov/41831744/
Chaithep T, Muangsanguan A, Castagnini JM et al. (2026). Protective Effects of Schinus terebinthifolius Leaf Supercritical Fluid Extract Against UVC-Induced Oxidative Stress: A Com-Prehensive Gene Expression Study. Int J Mol Sci. https://pubmed.ncbi.nlm.nih.gov/41828320/
Barlian A, Rahmah Y, Cho Y et al. (2026). Isolation of plant-derived exosome-like nanovesicles (PDENs) from Aloe vera and their effect on RAW 264.7 and 1BR3 cells as a potential anti-inflammatory and anti-photoaging agent. Future Sci OA. https://pubmed.ncbi.nlm.nih.gov/41817241/
Zhou Y, Valacchi G, Zhang Y et al. (2026). Recombinant collagen in the era of cellular agriculture. Trends Biotechnol [Review]. https://pubmed.ncbi.nlm.nih.gov/41807151/
Manurung RD, Ginting S, Wibowo S et al. (2026). Gynura procumbens Modulates VEGF Expression in Diabetic Wounds: Evidence from Immunohistochemistry and in silico Analysis. Pak J Biol Sci. https://pubmed.ncbi.nlm.nih.gov/41804242/
Huang PP, Chih PL, OuYang SY (2026). Preliminary Insights From a Split-Face Study on Skin Quality Changes After Needling Radiofrequency With or Without a Plant-Derived Exosome-Based Formulation Over 6 Months. Aesthet Surg J. https://pubmed.ncbi.nlm.nih.gov/41800727/
Kim HN, Park M, Won K et al. (2026). Anthocyanin-Containing Rose Petal Extract for Photoaging Improvement: A 12-Week Double-Blind Placebo-Controlled Clinical Trial. J Med Food. https://pubmed.ncbi.nlm.nih.gov/41788052/
Li W, Li X, Liu J et al. (2026). Protective effects of okra (Abelmoschus esculentus (L.) Moench) seed extract against acute and chronic UV-induced skin damage, implicating PLD-associated lipid signaling. J Photochem Photobiol B. https://pubmed.ncbi.nlm.nih.gov/41759312/
Zhu B, Zhang S, Ji C (2026). Codonopsis pilosula extract protects against osteoporosis by reducing oxidative stress and inflammation. J Mol Histol. https://pubmed.ncbi.nlm.nih.gov/41758402/
Cardona AIM, Escobedo-Gonzalez RG, Vazquez-Flores AA et al. (2026). Collagen-Inducing Compounds from Chihuahuan Desert Plants for Potential Skin Bioink 3D Printing Applications: A Narrative Review. J Funct Biomater [Review]. https://pubmed.ncbi.nlm.nih.gov/41745536/
Usme-Duque LK, Medina-Morales MA, León-Campos MI et al. (2026). Fermented Plant Extract-Loaded Collagen Scaffolds: Bioactive Hydrogels for Enhanced Wound Repair and Immune Modulation. Gels. https://pubmed.ncbi.nlm.nih.gov/41745001/
Ren DQ, Peng HZ, Zhang Y et al. (2026). Poly(γ-glutamic acid)-thickened PLLA microspheres with enhanced biocompatibility and efficacy in aged mice. J Mater Chem B. https://pubmed.ncbi.nlm.nih.gov/41736652/
Júnior DTS, Venâncio MA, Gusmão LJ et al. (2026). Ethnopharmacological evidence for the wound-healing activity of Vanillosmopsis erythropappa Schultz-bip leaf extract ointments. J Ethnopharmacol. https://pubmed.ncbi.nlm.nih.gov/41724287/
Ahmed RF, Rasheed DM, Mowaad NA et al. (2026). Synergistic wound healing mechanisms of Heliotropium curassavicum extracts via redox modulation, inflammation suppression, and tissue remodeling: linking phytochemical diversity to antioxidant and anti-inflammatory effects. Inflammopharmacology. https://pubmed.ncbi.nlm.nih.gov/41697548/
Sánchez-Cañadillas E, Morquecho Izquier A, Smith C et al. (2026). Isotopic evidence for human adaptation to island environments in the Canary Islands during the Amazigh period. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41688651/
Rodríguez L, Montecino-Garrido HL, Lagos F et al. (2026). Enhanced Antiplatelet Activity of Nitrated Fatty Acid Extracts from Phaseolus vulgaris L. Molecules. https://pubmed.ncbi.nlm.nih.gov/41683465/
Chonsut P, Tawanwongsri W, Naphatthalung J et al. (2026). Evaluation of liposome-encapsulated Centella asiatica ethanolic extract for enhanced in vitro and in vivo wound healing. Front Med Technol. https://pubmed.ncbi.nlm.nih.gov/41657731/
Kazemzadeh S, Raeeszadeh M, Akradi L (2026). Comparative effects of Pistacia atlantica leaf and phenytoin ointment on rat skin wound healing: histopathological changes and bioactive compounds. Inflammopharmacology. https://pubmed.ncbi.nlm.nih.gov/41656468/
Da Silva KKN, Câmara GLG, Gomes Júnior SV et al. (2025). Experimental evaluation of the healing potential of Sesuvium portulacastrum in excisional wounds in wistar rats. Front Bioeng Biotechnol. https://pubmed.ncbi.nlm.nih.gov/41783040/
20 studies — Vegan Collagen Blend
Ortiz-Hernández GD, Claudio-Rizo JA, González-Morales S et al. (2026). Sustainable collagen-xanthan gum hydrogel scaffolds with super-swelling behavior and biostimulatory activity for agricultural applications. Int J Biol Macromol. https://pubmed.ncbi.nlm.nih.gov/41865925/
Abdel-Sattar OE, El-Shiekh RA, Sabry MM et al. (2026). Zeinoside B, a pregnane glycoside from Caralluma adenensis (Defler) A. Berger, accelerates excisional wound healing in mice through antioxidant and reparative mechanisms. J Ethnopharmacol. https://pubmed.ncbi.nlm.nih.gov/41831744/
Chaithep T, Muangsanguan A, Castagnini JM et al. (2026). Protective Effects of Schinus terebinthifolius Leaf Supercritical Fluid Extract Against UVC-Induced Oxidative Stress: A Com-Prehensive Gene Expression Study. Int J Mol Sci. https://pubmed.ncbi.nlm.nih.gov/41828320/
Barlian A, Rahmah Y, Cho Y et al. (2026). Isolation of plant-derived exosome-like nanovesicles (PDENs) from Aloe vera and their effect on RAW 264.7 and 1BR3 cells as a potential anti-inflammatory and anti-photoaging agent. Future Sci OA. https://pubmed.ncbi.nlm.nih.gov/41817241/
Zhou Y, Valacchi G, Zhang Y et al. (2026). Recombinant collagen in the era of cellular agriculture. Trends Biotechnol [Review]. https://pubmed.ncbi.nlm.nih.gov/41807151/
Manurung RD, Ginting S, Wibowo S et al. (2026). Gynura procumbens Modulates VEGF Expression in Diabetic Wounds: Evidence from Immunohistochemistry and in silico Analysis. Pak J Biol Sci. https://pubmed.ncbi.nlm.nih.gov/41804242/
Huang PP, Chih PL, OuYang SY (2026). Preliminary Insights From a Split-Face Study on Skin Quality Changes After Needling Radiofrequency With or Without a Plant-Derived Exosome-Based Formulation Over 6 Months. Aesthet Surg J. https://pubmed.ncbi.nlm.nih.gov/41800727/
Kim HN, Park M, Won K et al. (2026). Anthocyanin-Containing Rose Petal Extract for Photoaging Improvement: A 12-Week Double-Blind Placebo-Controlled Clinical Trial. J Med Food. https://pubmed.ncbi.nlm.nih.gov/41788052/
Li W, Li X, Liu J et al. (2026). Protective effects of okra (Abelmoschus esculentus (L.) Moench) seed extract against acute and chronic UV-induced skin damage, implicating PLD-associated lipid signaling. J Photochem Photobiol B. https://pubmed.ncbi.nlm.nih.gov/41759312/
Zhu B, Zhang S, Ji C (2026). Codonopsis pilosula extract protects against osteoporosis by reducing oxidative stress and inflammation. J Mol Histol. https://pubmed.ncbi.nlm.nih.gov/41758402/
Cardona AIM, Escobedo-Gonzalez RG, Vazquez-Flores AA et al. (2026). Collagen-Inducing Compounds from Chihuahuan Desert Plants for Potential Skin Bioink 3D Printing Applications: A Narrative Review. J Funct Biomater [Review]. https://pubmed.ncbi.nlm.nih.gov/41745536/
Usme-Duque LK, Medina-Morales MA, León-Campos MI et al. (2026). Fermented Plant Extract-Loaded Collagen Scaffolds: Bioactive Hydrogels for Enhanced Wound Repair and Immune Modulation. Gels. https://pubmed.ncbi.nlm.nih.gov/41745001/
Ren DQ, Peng HZ, Zhang Y et al. (2026). Poly(γ-glutamic acid)-thickened PLLA microspheres with enhanced biocompatibility and efficacy in aged mice. J Mater Chem B. https://pubmed.ncbi.nlm.nih.gov/41736652/
Júnior DTS, Venâncio MA, Gusmão LJ et al. (2026). Ethnopharmacological evidence for the wound-healing activity of Vanillosmopsis erythropappa Schultz-bip leaf extract ointments. J Ethnopharmacol. https://pubmed.ncbi.nlm.nih.gov/41724287/
Ahmed RF, Rasheed DM, Mowaad NA et al. (2026). Synergistic wound healing mechanisms of Heliotropium curassavicum extracts via redox modulation, inflammation suppression, and tissue remodeling: linking phytochemical diversity to antioxidant and anti-inflammatory effects. Inflammopharmacology. https://pubmed.ncbi.nlm.nih.gov/41697548/
Sánchez-Cañadillas E, Morquecho Izquier A, Smith C et al. (2026). Isotopic evidence for human adaptation to island environments in the Canary Islands during the Amazigh period. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41688651/
Rodríguez L, Montecino-Garrido HL, Lagos F et al. (2026). Enhanced Antiplatelet Activity of Nitrated Fatty Acid Extracts from Phaseolus vulgaris L. Molecules. https://pubmed.ncbi.nlm.nih.gov/41683465/
Chonsut P, Tawanwongsri W, Naphatthalung J et al. (2026). Evaluation of liposome-encapsulated Centella asiatica ethanolic extract for enhanced in vitro and in vivo wound healing. Front Med Technol. https://pubmed.ncbi.nlm.nih.gov/41657731/
Kazemzadeh S, Raeeszadeh M, Akradi L (2026). Comparative effects of Pistacia atlantica leaf and phenytoin ointment on rat skin wound healing: histopathological changes and bioactive compounds. Inflammopharmacology. https://pubmed.ncbi.nlm.nih.gov/41656468/
Da Silva KKN, Câmara GLG, Gomes Júnior SV et al. (2025). Experimental evaluation of the healing potential of Sesuvium portulacastrum in excisional wounds in wistar rats. Front Bioeng Biotechnol. https://pubmed.ncbi.nlm.nih.gov/41783040/
The Benefits of Seaweed
Natural Iodine
Seaweed is a natural, whole-food source of iodine, an essential trace mineral critical for thyroid function. Kelp and other seaweed varieties provide iodine in a bioavailable form alongside naturally occurring minerals and antioxidants. Iodine is essential for the production of thyroid hormones, which regulate metabolism, energy, and growth.
Key Highlights
- Natural, whole-food source of iodine
- Supports normal thyroid function (EFSA approved via iodine)
- Iodine contributes to normal energy metabolism and cognitive function (EFSA approved)
- Contains trace minerals, antioxidants, and unique marine compounds
- Sustainable and environmentally friendly ingredient
- Important for thyroid health, especially during pregnancy
Biochemistry Timeline
Iodine from seaweed is well-absorbed. Thyroid function improvements may take 4-8 weeks of consistent adequate iodine intake. Note: iodine content in seaweed can vary significantly between products, so standardised supplements provide more predictable dosing.
Summary
Seaweed is a natural, sustainable source of iodine and trace minerals. It supports thyroid function, energy metabolism, and cognitive health through its iodine content. As a whole-food ingredient, it provides nutrients in a naturally balanced form.
FAQs
Can I have too much iodine from seaweed?
Yes, some seaweed varieties (particularly kelp) can be very high in iodine. Excessive iodine can actually impair thyroid function. Look for products with standardised iodine content and stay within recommended intake levels (150 µg/day for adults; EFSA upper limit 600 µg/day).
Research
Reski S, Mahata ME, Rizal Y et al. (2026). Alginate oligosaccharides derived from tropical brown seaweeds as sustainable alternatives to antibiotic growth promoters in poultry nutrition: Functional mechanisms and production perspectives. Vet World [Review]. https://pubmed.ncbi.nlm.nih.gov/41822569/
Wasson DE, Almeida C, Cueva SF et al. (2026). Effects of the macroalga Laurencia snackeyi on enteric methane emission and lactational performance in dairy cows. J Dairy Sci. https://pubmed.ncbi.nlm.nih.gov/41723001/
Cheng YC, Garavito-Duarte YR, Suarez MG et al. (2026). Effects of Dietary Marine Sulfated Polysaccharides Derived From Macroalgae on Intestinal Health of Nursery Pigs. Anim Sci J. https://pubmed.ncbi.nlm.nih.gov/41692406/
Chang YC, Liu HW, Hsieh TJ et al. (2026). The effects of Oligo-Fucoidan on muscle function in community-dwelling older adults: A double-blind, randomized, placebo-controlled trial. Arch Gerontol Geriatr. https://pubmed.ncbi.nlm.nih.gov/41124892/
Shibasaki M, Kodama H, Matsuda Y et al. (2025). Effect of Foods, Including Rice, Miso Soup, and Japanese Tea, on the Absorption of Zinc. J Nutr Sci Vitaminol (Tokyo). https://pubmed.ncbi.nlm.nih.gov/41485970/
Sun X, Li P, Chen B et al. (2025). Fucoidan Therapy for Extraintestinal Diseases: Targeting the Microbiota-Gut-Organ Axes. Biomolecules [Review]. https://pubmed.ncbi.nlm.nih.gov/41463403/
Rattanapitoon NK, Padchasuwan NH, Arunsan P et al. (2025). Commentary: Dietary supplementation with fermented rapeseed and seaweed modulates parasite infections and gut microbiota in outdoor pigs. Front Vet Sci. https://pubmed.ncbi.nlm.nih.gov/41394916/
Domel JR, Sobotik EB, House GM et al. (2025). Comparison of Impacts of Essential Oils, Green Tea Powder, Betaine, Probiotics, and Other Dietary Supplements on Growth and Well-Being of Heat-Stressed White Pekin Ducks. Animals (Basel). https://pubmed.ncbi.nlm.nih.gov/41375441/
Ward K, Cole MH, Griffiths LR et al. (2025). Therapeutic Potentials of the Seaweed-Derived Compounds for Alzheimer's Disease. Molecules [Review]. https://pubmed.ncbi.nlm.nih.gov/41302511/
Enríquez J, Quezada C, Molina J et al. (2025). Study Protocol and Baseline Cardiometabolic Characterization of the RIO-Study (Response to an Intervention with Omega-3): A Randomized, Double-Blind, Placebo-Controlled Crossover Trial on Lipid and Inflammatory Profiles in Overweight and Obese Adults with Hypertriglyceridemia in Valdivia, Chile. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41228467/
Hervet C, Bussy F, Morvan A et al. (2025). Algae extract supplementation boosts humoral immunity induced by attenuated PRRSV-1 vaccination. BMC Vet Res. https://pubmed.ncbi.nlm.nih.gov/41204351/
Lu J, Petri RM, Foster J et al. (2025). Targeted ileal microbiome modulation by in ovo seaweed polyphenols (Fucus spiralis) as an alternative to in-feed antibiotics in broiler chickens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41151447/
Ahmad I, Rawnsley RP, Bowman JP et al. (2025). Graduate Student Literature Review: Limitations in feeding red seaweed Asparagopsis species for enteric methane mitigation in ruminants. J Dairy Sci [Review]. https://pubmed.ncbi.nlm.nih.gov/41076247/
Chai HJ, Yi TK, Kao YF et al. (2025). Dual-Action Grouper Bone and Wakame Hydrolysates Supplement Enhances Exercise Performance and Modulates Gut Microbiota in Mice. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41010459/
Abdelqader A, Mahasneh ZMH, Van Hoeck V et al. (2025). Exogenous enzymes unlock prebiotic potential of Ulva lactuca: Boosting gut health and growth performance in broilers. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/40961780/
Dong J, Ma H, Liu K et al. (2025). Effects of Undaria pinnatifida-derived brown algae polysaccharide (UPS) on the nutritional composition, digestive capacity, immune performance and intestinal microbiota of juvenile sea cucumber (Apostichopus japonicus). PeerJ. https://pubmed.ncbi.nlm.nih.gov/40860657/
Naseer S, Asad F, Nadeem A et al. (2025). Evaluation of Sargassum ilicifolium as a functional feed additive to improve growth, haematology and disease resistance in Catla catla. J Fish Biol. https://pubmed.ncbi.nlm.nih.gov/40814941/
Ponnampalam EN, Jairath G, Alves SP et al. (2025). Sustainable livestock production by utilising forages, supplements, and agricultural by-products: Enhancing productivity, muscle gain, and meat quality - A review. Meat Sci [Review]. https://pubmed.ncbi.nlm.nih.gov/40759624/
Pereira A, Marmelo I, Chainho T et al. (2025). Improving Farmed Juvenile Gilthead Seabream (Sparus aurata) Stress Response to Marine Heatwaves and Vibriosis Through Seaweed-Based Dietary Modulation. Animals (Basel). https://pubmed.ncbi.nlm.nih.gov/40646869/
Unknown (2006). Iodine. [Review]. https://pubmed.ncbi.nlm.nih.gov/30000537/
20 studies — Seaweed
Reski S, Mahata ME, Rizal Y et al. (2026). Alginate oligosaccharides derived from tropical brown seaweeds as sustainable alternatives to antibiotic growth promoters in poultry nutrition: Functional mechanisms and production perspectives. Vet World [Review]. https://pubmed.ncbi.nlm.nih.gov/41822569/
Wasson DE, Almeida C, Cueva SF et al. (2026). Effects of the macroalga Laurencia snackeyi on enteric methane emission and lactational performance in dairy cows. J Dairy Sci. https://pubmed.ncbi.nlm.nih.gov/41723001/
Cheng YC, Garavito-Duarte YR, Suarez MG et al. (2026). Effects of Dietary Marine Sulfated Polysaccharides Derived From Macroalgae on Intestinal Health of Nursery Pigs. Anim Sci J. https://pubmed.ncbi.nlm.nih.gov/41692406/
Chang YC, Liu HW, Hsieh TJ et al. (2026). The effects of Oligo-Fucoidan on muscle function in community-dwelling older adults: A double-blind, randomized, placebo-controlled trial. Arch Gerontol Geriatr. https://pubmed.ncbi.nlm.nih.gov/41124892/
Shibasaki M, Kodama H, Matsuda Y et al. (2025). Effect of Foods, Including Rice, Miso Soup, and Japanese Tea, on the Absorption of Zinc. J Nutr Sci Vitaminol (Tokyo). https://pubmed.ncbi.nlm.nih.gov/41485970/
Sun X, Li P, Chen B et al. (2025). Fucoidan Therapy for Extraintestinal Diseases: Targeting the Microbiota-Gut-Organ Axes. Biomolecules [Review]. https://pubmed.ncbi.nlm.nih.gov/41463403/
Rattanapitoon NK, Padchasuwan NH, Arunsan P et al. (2025). Commentary: Dietary supplementation with fermented rapeseed and seaweed modulates parasite infections and gut microbiota in outdoor pigs. Front Vet Sci. https://pubmed.ncbi.nlm.nih.gov/41394916/
Domel JR, Sobotik EB, House GM et al. (2025). Comparison of Impacts of Essential Oils, Green Tea Powder, Betaine, Probiotics, and Other Dietary Supplements on Growth and Well-Being of Heat-Stressed White Pekin Ducks. Animals (Basel). https://pubmed.ncbi.nlm.nih.gov/41375441/
Ward K, Cole MH, Griffiths LR et al. (2025). Therapeutic Potentials of the Seaweed-Derived Compounds for Alzheimer's Disease. Molecules [Review]. https://pubmed.ncbi.nlm.nih.gov/41302511/
Enríquez J, Quezada C, Molina J et al. (2025). Study Protocol and Baseline Cardiometabolic Characterization of the RIO-Study (Response to an Intervention with Omega-3): A Randomized, Double-Blind, Placebo-Controlled Crossover Trial on Lipid and Inflammatory Profiles in Overweight and Obese Adults with Hypertriglyceridemia in Valdivia, Chile. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41228467/
Hervet C, Bussy F, Morvan A et al. (2025). Algae extract supplementation boosts humoral immunity induced by attenuated PRRSV-1 vaccination. BMC Vet Res. https://pubmed.ncbi.nlm.nih.gov/41204351/
Lu J, Petri RM, Foster J et al. (2025). Targeted ileal microbiome modulation by in ovo seaweed polyphenols (Fucus spiralis) as an alternative to in-feed antibiotics in broiler chickens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41151447/
Ahmad I, Rawnsley RP, Bowman JP et al. (2025). Graduate Student Literature Review: Limitations in feeding red seaweed Asparagopsis species for enteric methane mitigation in ruminants. J Dairy Sci [Review]. https://pubmed.ncbi.nlm.nih.gov/41076247/
Chai HJ, Yi TK, Kao YF et al. (2025). Dual-Action Grouper Bone and Wakame Hydrolysates Supplement Enhances Exercise Performance and Modulates Gut Microbiota in Mice. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41010459/
Abdelqader A, Mahasneh ZMH, Van Hoeck V et al. (2025). Exogenous enzymes unlock prebiotic potential of Ulva lactuca: Boosting gut health and growth performance in broilers. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/40961780/
Dong J, Ma H, Liu K et al. (2025). Effects of Undaria pinnatifida-derived brown algae polysaccharide (UPS) on the nutritional composition, digestive capacity, immune performance and intestinal microbiota of juvenile sea cucumber (Apostichopus japonicus). PeerJ. https://pubmed.ncbi.nlm.nih.gov/40860657/
Naseer S, Asad F, Nadeem A et al. (2025). Evaluation of Sargassum ilicifolium as a functional feed additive to improve growth, haematology and disease resistance in Catla catla. J Fish Biol. https://pubmed.ncbi.nlm.nih.gov/40814941/
Ponnampalam EN, Jairath G, Alves SP et al. (2025). Sustainable livestock production by utilising forages, supplements, and agricultural by-products: Enhancing productivity, muscle gain, and meat quality - A review. Meat Sci [Review]. https://pubmed.ncbi.nlm.nih.gov/40759624/
Pereira A, Marmelo I, Chainho T et al. (2025). Improving Farmed Juvenile Gilthead Seabream (Sparus aurata) Stress Response to Marine Heatwaves and Vibriosis Through Seaweed-Based Dietary Modulation. Animals (Basel). https://pubmed.ncbi.nlm.nih.gov/40646869/
Unknown (2006). Iodine. [Review]. https://pubmed.ncbi.nlm.nih.gov/30000537/
The Benefits of Horsetail Extract
Horsetail (Equisetum arvense) is a plant-based source of natural silica, a trace mineral that supports the structural integrity of hair, nails, skin, and connective tissue. Horsetail has been used in traditional European herbal medicine for centuries, valued for its high mineral content and its potential to support the body's structural tissues.
Key Highlights
- Natural plant source of silica (silicon dioxide)
- Supports hair, nail, and connective tissue structure
- One of the oldest plants on Earth (300+ million years)
- Traditional European herbal use for structural tissue support
- Often combined with biotin, zinc, and collagen for comprehensive hair support
Biochemistry Timeline
Silica from horsetail is absorbed over time. Hair and nail improvements may take 3-6 months due to slow growth cycles. Consistent daily supplementation is important for structural tissue benefits.
Summary
Horsetail Extract is a natural, plant-based source of silica that supports the structural integrity of hair, nails, and connective tissue. It has been used in European herbal medicine for centuries and is often combined with other hair-supportive nutrients for comprehensive support.
FAQs
Is horsetail safe long-term?
Horsetail extract is generally safe for most people. However, it contains small amounts of thiaminase (an enzyme that breaks down thiamine/B1), so long-term use should be accompanied by adequate B1 intake. Consult your healthcare provider for extended use.
Research
Johnson W et al. — Int J Toxicol (2026). [Safety assessment]. https://pubmed.ncbi.nlm.nih.gov/41069090/
Invernizzi M et al. — Med Sci (2025). [Clinical trial]. https://pubmed.ncbi.nlm.nih.gov/40981167/
Salvadori L et al. — Biomed Pharmacother (2024). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/38574619/
Sureshkumar J et al. — J Ethnopharmacol (2023). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/37207877/
Carneiro DM et al. — Phytomedicine (2022). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/35168030/
Waterstradt A et al. — Planta Med (2022). [RCT (3-armed pilot)]. https://pubmed.ncbi.nlm.nih.gov/34706374/
Shiba F et al. — Int J Dent (2022). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/36794024/
Boeing T et al. — Evid Based Complement Alternat Med (2021). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/33747109/
Batir-Marin D et al. — Molecules (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33924900/
Boqué N et al. — Sci Rep (2021). [RCT (crossover, double-blind)]. https://pubmed.ncbi.nlm.nih.gov/34389753/
Araújo LA et al. — An Bras Dermatol (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27438200/
Asgharikhatooni A et al. — Iran Red Crescent Med J (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26019907/
12 studies — Horsetail Extract
Johnson W et al. — Int J Toxicol (2026). [Safety assessment]. https://pubmed.ncbi.nlm.nih.gov/41069090/
Invernizzi M et al. — Med Sci (2025). [Clinical trial]. https://pubmed.ncbi.nlm.nih.gov/40981167/
Salvadori L et al. — Biomed Pharmacother (2024). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/38574619/
Sureshkumar J et al. — J Ethnopharmacol (2023). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/37207877/
Carneiro DM et al. — Phytomedicine (2022). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/35168030/
Waterstradt A et al. — Planta Med (2022). [RCT (3-armed pilot)]. https://pubmed.ncbi.nlm.nih.gov/34706374/
Shiba F et al. — Int J Dent (2022). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/36794024/
Boeing T et al. — Evid Based Complement Alternat Med (2021). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/33747109/
Batir-Marin D et al. — Molecules (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33924900/
Boqué N et al. — Sci Rep (2021). [RCT (crossover, double-blind)]. https://pubmed.ncbi.nlm.nih.gov/34389753/
Araújo LA et al. — An Bras Dermatol (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27438200/
Asgharikhatooni A et al. — Iran Red Crescent Med J (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26019907/
The Benefits of Coconut Water
Coconut water is a natural, refreshing liquid from young green coconuts that provides electrolytes including potassium, sodium, and magnesium. It is used as a natural flavouring and functional ingredient, contributing hydration support and natural electrolyte balance to our formulations.
Key Highlights
- Natural source of electrolytes (potassium, sodium, magnesium)
- Supports hydration and electrolyte balance
- Low calorie, naturally refreshing
- Traditional tropical beverage used for centuries
Biochemistry Timeline
The electrolytes and minerals in coconut water are absorbed rapidly in the small intestine, similarly to an oral rehydration solution. Potassium, the most abundant mineral in coconut water, helps regulate fluid balance and supports normal muscle and nerve function. Hydration benefits are felt almost immediately after consumption.
Summary
Coconut water provides natural electrolytes and hydration support. As a functional ingredient in our formulations, it contributes to taste and provides trace minerals including potassium, sodium, and magnesium.
FAQs
Why is coconut water included in a supplement?
Coconut water provides natural electrolytes, including potassium, magnesium, and sodium, in a balanced form. In powdered extract form, it contributes minerals that support hydration at a cellular level.
Is coconut water the same as coconut milk?
No. Coconut water is the clear liquid found inside young coconuts and is low in fat. Coconut milk is made from the pressed flesh of mature coconuts and is high in fat.
Research
Bell SK & Spriet LL — J Strength Cond Res (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/41359932/
Kedia S et al. — Clin Gastroenterol Hepatol (2024). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/38278200/
Nakorn SN et al. — Heliyon (2024). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/39759299/
Erukainure OL & Chukwuma CI — Plants (2024). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/38475510/
O'Brien BJ et al. — Sports (Basel) (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37755860/
Nuha K et al. — Int J Environ Res Public Health (2023). [Comparative trial]. https://pubmed.ncbi.nlm.nih.gov/37623203/
Dai Y et al. — PeerJ (2021). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/33575128/
Patel RM et al. — Biomed Res Int (2018). [Clinical study]. https://pubmed.ncbi.nlm.nih.gov/30515390/
Peart DJ et al. — Int J Sport Nutr Exerc Metab (2017). [RCT]. https://pubmed.ncbi.nlm.nih.gov/27768399/
Pérez-Idárraga A & Aragón-Vargas LF — Appl Physiol Nutr Metab (2014). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25017113/
Kalman DS et al. — J Int Soc Sports Nutr (2012). [RCT]. https://pubmed.ncbi.nlm.nih.gov/22257640/
Nutritional profile — established (Established). [Nutritional data].
Cytokinins and growth factors — established (Established). [Biochemical].
13 studies — Coconut Water
Bell SK & Spriet LL — J Strength Cond Res (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/41359932/
Kedia S et al. — Clin Gastroenterol Hepatol (2024). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/38278200/
Nakorn SN et al. — Heliyon (2024). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/39759299/
Erukainure OL & Chukwuma CI — Plants (2024). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/38475510/
O'Brien BJ et al. — Sports (Basel) (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37755860/
Nuha K et al. — Int J Environ Res Public Health (2023). [Comparative trial]. https://pubmed.ncbi.nlm.nih.gov/37623203/
Dai Y et al. — PeerJ (2021). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/33575128/
Patel RM et al. — Biomed Res Int (2018). [Clinical study]. https://pubmed.ncbi.nlm.nih.gov/30515390/
Peart DJ et al. — Int J Sport Nutr Exerc Metab (2017). [RCT]. https://pubmed.ncbi.nlm.nih.gov/27768399/
Pérez-Idárraga A & Aragón-Vargas LF — Appl Physiol Nutr Metab (2014). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25017113/
Kalman DS et al. — J Int Soc Sports Nutr (2012). [RCT]. https://pubmed.ncbi.nlm.nih.gov/22257640/
Nutritional profile — established (Established). [Nutritional data].
Cytokinins and growth factors — established (Established). [Biochemical].
The Benefits of Avocado
Avocado is a nutrient-dense fruit rich in healthy monounsaturated fats, potassium, vitamin E, vitamin K, folate, and fibre. As a functional ingredient, it provides healthy fats that support the absorption of fat-soluble vitamins and nutrients, alongside its own nutritional benefits for skin, heart, and metabolic health.
Key Highlights
- Rich in monounsaturated fats for heart health
- Good source of vitamin E, K, potassium, and folate
- Supports absorption of fat-soluble vitamins
- Provides fibre and antioxidants
Biochemistry Timeline
The nutrients in avocado extract, including healthy monounsaturated fats, potassium, and vitamins E and K, are absorbed through standard digestive processes. The fats in avocado can also enhance absorption of fat-soluble vitamins from other foods or supplements taken at the same time.
Summary
Avocado is a nutrient-dense ingredient providing healthy fats, vitamins, and minerals. Its monounsaturated fat content supports the absorption of fat-soluble nutrients and contributes to heart and skin health.
FAQs
Why is avocado in a supplement formula?
Avocado extract provides concentrated nutrients including vitamin E, potassium, and beneficial fatty acids. These compounds support skin health, cellular function, and help with absorption of fat-soluble nutrients.
Is avocado extract suitable for people with latex allergies?
Some individuals with latex allergies may also react to avocado due to cross-reactive proteins. If you have a known latex allergy, consult your healthcare provider before taking avocado-containing supplements.
Research
Ford NA et al. — Foods (2023). [Nutritional analysis]. https://pubmed.ncbi.nlm.nih.gov/37444254/
Conceição AR et al. — Nutr Res (2022). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35405602/
Dreher ML et al. — Nutrients (2021). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/34959933/
Cervantes-Paz B & Yahia EM — Compr Rev Food Sci Food Saf (2021). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/34146454/
Bhuyan DJ et al. — Antioxidants (Basel) (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31554332/
Nutritional profile — established (Established). [Nutritional data].
6 studies — Avocado
Ford NA et al. — Foods (2023). [Nutritional analysis]. https://pubmed.ncbi.nlm.nih.gov/37444254/
Conceição AR et al. — Nutr Res (2022). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35405602/
Dreher ML et al. — Nutrients (2021). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/34959933/
Cervantes-Paz B & Yahia EM — Compr Rev Food Sci Food Saf (2021). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/34146454/
Bhuyan DJ et al. — Antioxidants (Basel) (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31554332/
Nutritional profile — established (Established). [Nutritional data].
The Benefits of Cucumber
Cucumber is a hydrating, low-calorie ingredient rich in water content (approximately 96% water), silica, and vitamin K. It provides gentle hydration support and trace minerals, and has been traditionally used for skin health both internally and externally.
Key Highlights
- Approximately 96% water content for hydration
- Contains natural silica for skin and connective tissue
- Source of vitamin K and trace minerals
- Traditionally valued for skin health and cooling properties
Biochemistry Timeline
Cucumber extract provides silica, vitamin K, and antioxidant compounds including flavonoids and lignans. These nutrients are absorbed through normal digestive processes. Silica, in particular, supports connective tissue health and may contribute to skin and nail integrity over time with consistent intake.
Summary
Cucumber provides natural hydration, silica, and vitamin K. Its high water content and trace mineral profile make it a gentle, refreshing functional ingredient.
FAQs
What nutrients does cucumber provide?
Beyond hydration, cucumber is a source of silica, vitamin K, and several antioxidant flavonoids. In concentrated extract form, these nutrients are delivered in meaningful amounts.
How does cucumber support skin health?
Cucumber contains silica, which contributes to connective tissue health, and antioxidant compounds that may help protect skin cells from oxidative stress.
Research
Hausenblas HA et al. — Health Sci Rep (2025). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/40636535/
Amani T et al. — Cureus (2024). [In vitro study]. https://pubmed.ncbi.nlm.nih.gov/38327926/
Li C et al. — Int J Biol Macromol (2024). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/38336313/
Qing Z et al. — Phytochemistry (2022). [Phytochemical analysis]. https://pubmed.ncbi.nlm.nih.gov/35182783/
Naureen Z et al. — J Prev Med Hyg (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36479487/
Cucurbitacin bioactivity — review (2022). [Phytochemical review].
Nash RJ et al. — ACS Omega (2020). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/32656449/
Bernardini C et al. — BMC Complement Altern Med (2018). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/29941006/
Nutritional profile — established (Established). [Nutritional data].
Silica content — established (Established). [Nutritional data].
Hydration properties — established (Established). [Nutritional data].
Traditional dermatological use — established (Established). [Historical/ethnobotanical].
12 studies — Cucumber
Hausenblas HA et al. — Health Sci Rep (2025). [RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/40636535/
Amani T et al. — Cureus (2024). [In vitro study]. https://pubmed.ncbi.nlm.nih.gov/38327926/
Li C et al. — Int J Biol Macromol (2024). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/38336313/
Qing Z et al. — Phytochemistry (2022). [Phytochemical analysis]. https://pubmed.ncbi.nlm.nih.gov/35182783/
Naureen Z et al. — J Prev Med Hyg (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36479487/
Cucurbitacin bioactivity — review (2022). [Phytochemical review].
Nash RJ et al. — ACS Omega (2020). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/32656449/
Bernardini C et al. — BMC Complement Altern Med (2018). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/29941006/
Nutritional profile — established (Established). [Nutritional data].
Silica content — established (Established). [Nutritional data].
Hydration properties — established (Established). [Nutritional data].
Traditional dermatological use — established (Established). [Historical/ethnobotanical].
The Benefits of Kale
Kale is a nutrient-dense leafy green that provides an impressive array of vitamins and minerals including vitamin K, vitamin C, vitamin A (as beta-carotene), calcium, iron, and potent antioxidants including lutein and zeaxanthin. It is one of the most nutritionally concentrated vegetables available.
Key Highlights
- Exceptionally rich in vitamin K (supports bone health and blood clotting)
- Good source of vitamin C, vitamin A, calcium, and iron
- Contains lutein and zeaxanthin (eye health antioxidants)
- One of the most nutrient-dense foods available
- Rich in fibre and plant-based antioxidants
Biochemistry Timeline
Kale is rich in vitamins K, C, and A, along with minerals like calcium and iron. These nutrients are absorbed in the small intestine. The glucosinolates in kale are converted by gut bacteria into biologically active compounds. Vitamin K from kale is fat-soluble and best absorbed alongside dietary fats.
Summary
Kale is a nutritional powerhouse providing vitamins K, C, and A alongside calcium, iron, and antioxidants. As a functional ingredient, it contributes concentrated plant-based nutrition to our formulations.
FAQs
Why is kale considered a superfood?
Kale is exceptionally nutrient-dense, providing high levels of vitamins K, C, and A, plus calcium, iron, and powerful antioxidants like kaempferol and quercetin, all in a very low-calorie package.
Should people on blood thinners be cautious with kale?
Yes. Kale is very high in vitamin K, which plays a role in blood clotting. If you take anticoagulant medications like warfarin, consult your healthcare provider about your vitamin K intake.
Research
Katayama S — Yakugaku Zasshi (2025). [Review + preclinical]. https://pubmed.ncbi.nlm.nih.gov/39756921/
Aldisi D et al. — Front Nutr (2024). [Cross-over trial]. https://pubmed.ncbi.nlm.nih.gov/39114118/
Rachwał K et al. — Molecules (2023). [In vitro]. https://pubmed.ncbi.nlm.nih.gov/37836781/
Kappler K et al. — Clin Cosmet Investig Dermatol (2022). [Clinical + in vitro]. https://pubmed.ncbi.nlm.nih.gov/36199383/
Mrowicka M et al. — Nutrients (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35215476/
Raychaudhuri S et al. — PLoS One (2021). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/34432833/
Nutritional profile — USDA/established (Established). [Nutritional data].
Glucosinolate content — established (Established). [Nutritional science].
Kaempferol content — established (Established). [Phytochemistry].
Calcium bioavailability — established (Established). [Nutritional science].
Vitamin K content — established (Established). [USDA data].
ANDI score — established (Established). [Nutritional ranking].
12 studies — Kale
Katayama S — Yakugaku Zasshi (2025). [Review + preclinical]. https://pubmed.ncbi.nlm.nih.gov/39756921/
Aldisi D et al. — Front Nutr (2024). [Cross-over trial]. https://pubmed.ncbi.nlm.nih.gov/39114118/
Rachwał K et al. — Molecules (2023). [In vitro]. https://pubmed.ncbi.nlm.nih.gov/37836781/
Kappler K et al. — Clin Cosmet Investig Dermatol (2022). [Clinical + in vitro]. https://pubmed.ncbi.nlm.nih.gov/36199383/
Mrowicka M et al. — Nutrients (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35215476/
Raychaudhuri S et al. — PLoS One (2021). [Preclinical]. https://pubmed.ncbi.nlm.nih.gov/34432833/
Nutritional profile — USDA/established (Established). [Nutritional data].
Glucosinolate content — established (Established). [Nutritional science].
Kaempferol content — established (Established). [Phytochemistry].
Calcium bioavailability — established (Established). [Nutritional science].
Vitamin K content — established (Established). [USDA data].
ANDI score — established (Established). [Nutritional ranking].
The Benefits of Lemon
Lemon provides natural vitamin C, citric acid, and flavonoids including hesperidin and diosmin. It is used as both a flavouring and a functional ingredient, contributing natural acidity, antioxidant compounds, and vitamin C that supports immune function, iron absorption, and collagen formation.
Key Highlights
- Natural source of vitamin C
- Contains citrus flavonoids (hesperidin, diosmin) with antioxidant properties
- Supports iron absorption when consumed with iron-rich foods
- Refreshing natural flavouring
- Traditional use for immune support and vitality
Biochemistry Timeline
The vitamin C and citric acid in lemon extract are absorbed quickly in the small intestine. Vitamin C reaches peak blood levels within 1 to 3 hours. Citric acid may support mineral absorption by creating a mildly acidic environment in the gut. The flavonoids in lemon, particularly hesperidin, are metabolised by gut bacteria and contribute to antioxidant activity.
Summary
Lemon provides natural vitamin C, citric acid, and citrus flavonoids. It contributes both flavour and functional benefits to our formulations, supporting immune health and nutrient absorption.
FAQs
What makes lemon extract different from just eating lemons?
Lemon extract provides concentrated levels of the beneficial compounds, including vitamin C, citric acid, and flavonoids, in amounts that would be impractical to achieve through fresh lemon consumption alone.
Can lemon extract affect tooth enamel?
In supplement form (capsules or tablets), lemon extract does not come into prolonged contact with tooth enamel, unlike drinking lemon juice directly, so this is not a concern.
Research
Posadino AM et al. — Nutrients (2024). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/39203756/
Yao L et al. — Biomed Pharmacother (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35987162/
Singh N et al. — Med Chem (2021). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/32901586/
Figueira JA et al. — Molecules (2021). [Comparative study]. https://pubmed.ncbi.nlm.nih.gov/34299476/
Barghouthy Y & Somani BK — Nutrients (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34836376/
Klimek-Szczykutowicz M et al. — Plants (2020). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/31963590/
Vitamin C and iron absorption — EFSA (Established). [Regulatory/established].
Citrus flavonoids — established (Established). [Established science].
Hesperidin content — established (Established). [Phytochemistry].
Citric acid and iron absorption — established (Established). [Nutritional biochemistry].
D-limonene content — established (Established). [Phytochemistry].
11 studies — Lemon
Posadino AM et al. — Nutrients (2024). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/39203756/
Yao L et al. — Biomed Pharmacother (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35987162/
Singh N et al. — Med Chem (2021). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/32901586/
Figueira JA et al. — Molecules (2021). [Comparative study]. https://pubmed.ncbi.nlm.nih.gov/34299476/
Barghouthy Y & Somani BK — Nutrients (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34836376/
Klimek-Szczykutowicz M et al. — Plants (2020). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/31963590/
Vitamin C and iron absorption — EFSA (Established). [Regulatory/established].
Citrus flavonoids — established (Established). [Established science].
Hesperidin content — established (Established). [Phytochemistry].
Citric acid and iron absorption — established (Established). [Nutritional biochemistry].
D-limonene content — established (Established). [Phytochemistry].
Sustainably delivered and refilled, monthly.
Personalized Plan
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Pouches OnlyNo new tube each time -
Fully CompostableBreaks down completely
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All PaperNothing to sort
Glass Bottles
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Refill BagsFits into your day
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Less PackagingLighter every reorder
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Glass Built to LastReuse for years
Try it for 90 days completely risk-free.
Formulated without gluten, dairy, corn and common allergens.
Manufactured to the highest standards with GMP, ISO22000, HACCP.
Continuously tested and approved by Fødevarestyrelsen.
Questions?
We're here to help.
Skin+ is formulated to support healthy hair growth, radiant skin, and stronger nails through a blend of key nutrients like biotin, zinc, hyaluronic acid, collagen-forming amino acids, and botanical extracts. It’s designed to nourish you from within and complement your daily self-care routine.
If you're experiencing brittle nails, thinning hair, or dull skin—or simply want to support your natural beauty from the inside out—this may be a good fit. To be sure, try our free online health assessment by clicking the “Take Test Now” button at the top of our site. It only takes a few minutes and gives personalised, non-binding recommendations—no subscription needed.
Take your 3 capsules during a meal, preferably in the morning or early afternoon. Avoid taking it on an empty stomach.
In most cases, yes. However, if you’re taking other products with similar ingredients (like zinc or biotin), be mindful not to exceed recommended daily amounts. If you’re unsure, our free online health test can help you figure out which supplements suit your body, no subscription needed.
We recommend taking the capsules with food and water, as this can support optimal nutrient absorption and reduce the chance of mild stomach discomfort.
No, this product is not recommended during pregnancy or breastfeeding. Always check with your healthcare provider for safe alternatives.
Yes, this supplement can be taken long term as part of a balanced wellness routine. If you're unsure whether it's right for you, we invite you to try our free health assessment at the top of our website, it gives personalised suggestions based on your body and needs.
Most people tolerate this supplement well. However, as with any product, sensitivities can vary. If you notice any unusual symptoms, stop taking it and speak to a healthcare professional.
If you’re taking medication or are under medical supervision, it’s always best to speak with your doctor before adding a supplement to your routine. While our Skin+ is well-tolerated by most, individual interactions may occur.
Skin+ combines targeted nutrients and plant extracts that support hair, skin, and nail health in consistent amounts, which can be difficult to obtain daily through diet alone. It’s a convenient way to supplement a healthy lifestyle, but not a replacement for one.
Results vary by individual, but many customers begin to notice visible changes to hair, skin, and nails within 6 to 12 weeks of daily use. Remember, beauty from within takes consistency and time.
You can take the 3 capsules together or split them throughout the day, whatever suits your routine best, as long as you take them with food and water.
No worries, just take your next dose as normal. There’s no need to double up. Consistency over time is what matters most.
This supplement is intended for healthy adults. It is not recommended for children or adolescents, and elderly individuals should consult with a healthcare provider before use.
Please review the ingredients list carefully. Although our manufacturing facility takes precautions, it handles allergy-based materials, so traces may still be present.
Our Vitamins are manufactured in the UK under strict GMP (Good Manufacturing Practice) standards. It’s then handled and packed in Denmark with full traceability. Each batch undergoes rigorous quality and safety checks to ensure purity, potency, and consistency , so you always know you're getting exactly what’s on the label.
Yes,Skin+ is vegan-friendly. We’ve carefully selected plant-based ingredients and vegan sources to make it suitable for those following a plant-based lifestyle.
Every 30 days we prepare a fresh delivery of your personalized supplements. Your first order arrives in a reusable dispenser box, and every refill after that comes in a biodegradable pouch that slots straight into your dispenser. There's no lock-in, so you can pause, skip, or cancel anytime from your account.
Subscribers save 16% on every delivery, applied automatically. No setup fees, no hidden charges. The discount stays the same as long as your subscription is active.
Yes. You can pause, skip, or cancel anytime from your account dashboard with no minimum commitment and no cancellation fee. If you pause or skip, your next delivery simply waits until you're ready to resume.
Your payment method is charged 3 to 5 days before your next scheduled dispatch date, so your shipment arrives before your current supply runs out. You can view the exact date anytime by logging into your account.
Your first order includes the reusable dispenser box plus your personalized daily supplement pouches. Every refill after that comes in biodegradable pouches that slot straight into your existing dispenser, so you're only replacing what needs replacing.
Our free 3-minute health quiz asks about your body, lifestyle, diet, goals, and any health concerns. The algorithm then matches you to the nutrients your body is most likely to need, drawing on peer-reviewed research and EFSA-approved evidence. No guesswork, no one-size-fits-all.
Yes. You can retake the quiz anytime to refresh your recommendation, or add, swap, or remove individual supplements from your account dashboard. Your plan evolves with you.
Our supplements are formulated to EU safety standards and produced in certified facilities. The quiz screens for interactions with anything you're already taking and flags potential conflicts. For specific medical conditions or prescription drugs, we always recommend checking with your doctor before starting.
Orders are dispatched within 1 to 3 business days of payment. Delivery typically takes another 2 to 10 business days depending on your location and chosen carrier. Once your order ships, you'll receive a tracking link by email so you can follow it the whole way.
We currently ship to Denmark, Scandinavia, and select European countries. Available delivery areas are shown at checkout. If your country isn't listed, email support@persona-path.com and we'll see what's possible.
First-time customers are covered by our 30-day money-back guarantee. If you're not fully satisfied with your first purchase, email support@persona-path.com within 30 days and we'll refund you in full. You don't need to return the supplements, and refunds are processed to your original payment method within 5 business days of approval.
Yes. In addition to our 30-day guarantee, EU law gives you a 14-day right of withdrawal from the day you receive your order. Email support@persona-path.com within 14 days and we'll refund the full purchase price, including standard delivery, within 14 days of your request.
Email support@persona-path.com within 7 days with your order number and a photo of the issue. We'll arrange a free replacement or issue a full refund for the affected product. We cover all costs in these cases.
Yes. Your quiz answers are processed under GDPR with your explicit consent and used only to generate your personalized plan. We never sell your data or share it with advertising platforms. You can request deletion at any time. Full details in our privacy policy.
Our quiz screens for pregnancy, breastfeeding, and major health conditions, and the algorithm adjusts your recommendations accordingly. We're not a substitute for medical advice, so please check with your doctor before starting any new supplement if you're pregnant, breastfeeding, or managing a health condition.
