Overview
Coenzyme for carboxylases — popular for hair and nails despite weak data outside true deficiency.
- Whole-food sources (animal products for fat-soluble and B-complex vitamins; produce for water-soluble vitamins)
- Fortified foods (cereals, dairy, plant milks, nutritional yeast)
- Multivitamins or stand-alone supplements in synthetic or food-derived form
- Capsule or softgel
- Sublingual tablet or liquid
- Methylated active form for sensitive individuals
- Multivitamin matrix
Forms & variants of Biotin (B7)
Different chemical forms of Biotin (B7) behave differently. Browse each form's mechanism, bioavailability, and best-use context.
Mechanism of action
Cofactor for 5 carboxylases involved in gluconeogenesis, fatty acid synthesis, and amino acid metabolism.
- · Carboxylase activity
- · Keratin substrate availability
Effects on the body
Organ system effects
Biotin (B7) supports collagen synthesis, antioxidant defense, or barrier function in skin and integumentary tissues.
Evidence-based benefits
Reverses hair/nail issues in biotin deficiency
Strong evidenceImproves hair growth in non-deficient adults
Limited evidencePotential side effects
- · Acne flare
- · Falsely alters thyroid/troponin lab assays at high dose
Drug interactions
Supplement interactions
- Collagen peptidesProvides amino acid substrate for connective tissue synthesis.
- Vitamin CRequired cofactor for collagen hydroxylation.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
Affiliate links — we may earn a commission at no extra cost to you. Amazon code supplementsch-20 is auto-applied at checkout. We don't endorse specific brands; verify third-party testing (USP, NSF, Informed Sport) before purchase.
Third-party testedIndependently verified Biotin (B7) — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.Biotin (B7) third party tested NSF
CapsulesPre-measured Biotin (B7) capsules — easiest for travel and consistent daily dosing without scoops or scales.Biotin (B7) capsules
PowderBulk unflavored Biotin (B7) powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.Biotin (B7) powder unflavored
Best sellersMost-purchased Biotin (B7) products on Amazon — a quick way to see what's reviewed widely before you commit.Biotin (B7) best sellerScientific evidence9Show studiesHide studies
Biotin for hair and nail growth
Patel DP, et al.
Review of biotin trials in hair/nail disorders.
Benefits limited to documented biotin deficiency.
PubMed: Biotin (B7) — Reverses hair/nail issues in biotin deficiency
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PubMed: Biotin (B7) — Improves hair growth in non-deficient adults
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PubMed: Biotin (B7) — randomized controlled trial
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PubMed: Biotin (B7) — meta-analysis
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PubMed: Biotin (B7) — pharmacokinetics
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PubMed: Biotin (B7) — safety adverse events
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PubMed: Biotin (B7) — dose response
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Google Scholar: Biotin (B7) — clinical evidence
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Cross-database citation index for Biotin (B7) as it relates to "clinical evidence".
Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.