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Vitamin

Biotin (Hair Dose)

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Biotin (Hair Dose). B-vitamin used cosmetically for hair and nail growth.

How it works. Cofactor for carboxylase enzymes; influences keratin gene expression.

What the research supports. 2 graded claims. Strongest: Improves brittle nails (moderate).

How much to take. Typical dose: 2500–5000 mcg.

Side effects and interactions. 1 medication interaction listed. Serious: Interferes with thyroid, troponin labs.

Stacking. Pairs well with Collagen peptides, Vitamin C.

Common forms. Available as Capsule or softgel, Sublingual tablet or liquid, Methylated active form for sensitive individuals, Multivitamin matrix.

Key studies. 9 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Biotin (Hair Dose). Anecdotes are not medical advice.

Biotin (Hair Dose). B-vitamin used cosmetically for hair and nail growth.

Molecular structureC10H16N2O3S · 244.31 g/mol

What it is

B-vitamin used cosmetically for hair and nail growth.

Food sources

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

Goals

Skin, Hair & Nails

How it works

Cofactor for carboxylase enzymes; influences keratin gene expression.

Pathways

  • Cofactor for carboxylase enzymes
  • influences keratin gene expression

Effects

  • +brittle nails supports
  • +Hair benefits only in deficiency supports

What the research supports

Improves brittle nailsmoderate
Hair benefits only in deficiencylimited

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
2500–5000 mcg
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodEither
Best formMost evidence is based on the capsule or softgel form.
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Side effects & interactions

Serious

  • Interferes with thyroid, troponin labs

Medication interactions

Prescription medications (general)minor

Always disclose Biotin (Hair Dose) use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Collagen peptidesProvides amino acid substrate for connective tissue synthesis.
  • Vitamin CRequired cofactor for collagen hydroxylation.

Common forms

  • Capsule or softgel
  • Sublingual tablet or liquid
  • Methylated active form for sensitive individuals
  • Multivitamin matrix

Key studies

9 studies cited in total.

PubMed: Biotin (Hair Dose) — Improves brittle nails ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Biotin (Hair Dose) and "Improves brittle nails". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Biotin (Hair Dose) — Hair benefits only in deficiency ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Biotin (Hair Dose) and "Hair benefits only in deficiency". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Biotin (Hair Dose) — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Biotin (Hair Dose) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

Discussion

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