Evidence Stack
Search
Back to database
2.5/5 Weak evidence

Hair, skin & nails evidence brief

Biotin

Biotin can help when deficiency or a related disorder is present, but routine beauty claims for healthy users are poorly supported.

Mostly deficiency-dependent health 5 linked sources Content audit 2026-05-05

Headline Finding

2017 review: published improvement cases were tied to underlying pathology or deficiency; strong evidence in healthy users was lacking.

Dose Context

Correcting deficiency is a clinical nutrition issue. High-dose cosmetic use should be avoided before lab testing unless disclosed to clinicians.

Important Caveat

Biotin can interfere with some lab tests, including hormone and cardiac-marker assays, so users should tell clinicians before blood work.

Source Drawer

Linked Research

5 papers and evidence links - audit 2026-05-05
  1. Review Hair-loss biotin review
  2. Review Hair-loss review PubMed
  3. Review NIH ODS biotin fact sheet
  4. Review FDA biotin interference update
  5. Review StatPearls biotin overview

How To Read This Rating

The score reflects evidence that the supplement does its stated job. Some jobs are direct, such as strength, endurance, or recovery; others are indirect, such as sleep, mood, appetite, or health support. A real effect can still receive a cautious practical rating when dose, safety, product quality, or audience fit remain uncertain.

Spot An Evidence Issue?

Send the disputed claim, source link, and why it changes the practical verdict. Corrections that materially affect the claim, dose, caveat, or rating are prioritized.

Report a source or rating issue