Biotin (Vitamin B7)

Commonly marketed for hair/skin/nails; evidence for benefit in non-deficient individuals is limited. Can interfere with lab tests at higher doses.

womens-healthskin-hair

Dosing model

FLATFixed dose (no body-weight scaling).

Min dose

0 mg

Max dose

5 mg

Rounding

0 mg

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Stacks containing Biotin (Vitamin B7)

Public community stacks that include this ingredient.

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womens-health

Hair + Nails Reality Check Stack

by@athlete

Minimalist approach that focuses on likely gaps and avoids mega-dosing trends.

Biotin (Vitamin B7)

2mg

Vitamin C

500mg

Zinc

15mg

New

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Evidence

2 records

Hair/nail claims and evidence quality

General population • Government evidence review

Low

ODS notes hair/nail claims are supported at best by small studies and case reports; highlights deficiency contexts.

Dose: 0 mg • Duration: Varies

Citation: NIH ODS – Biotin: Health Professional Fact Sheet

Immunoassay interference (thyroid and other tests)

Individuals taking high-dose biotin supplements • Review / safety analysis

Moderate

High-dose biotin (≥5 mg/day) can cause falsely elevated or depressed results in streptavidin-biotin immunoassays including thyroid hormones (TSH, fT4, fT3), troponin, and other common panels. Biotin should be withheld 48–72 hours before testing.

Dose: 10 mg • Duration: Acute (single dose effect on assays)

Citation: Samarasinghe S, et al. Biotin interference with routine clinical immunoassays: understand the causes and mitigate the risks. Endocr Pract. 2017;23(8):989-998.

Forms

Capsule / tablet

Tell clinicians before lab tests