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
Evidence last reviewed: 04 Apr 2026
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Evidence
2 records
Hair/nail claims & evidence quality
General population • Government evidence review
PUBMEDLow
ODS notes hair/nail claims are supported at best by small studies & case reports; highlights deficiency contexts.
Dose: 0 mgDuration: Varies
Immunoassay interference (thyroid & other tests)
Individuals taking high-dose biotin supplements • Review / safety analysis
PUBMEDModerate
High-dose biotin (≥5 mg/day) can cause falsely elevated or depressed results in streptavidin-biotin immunoassays including thyroid hormones (TSH, fT4, fT3), troponin, & other common panels. Biotin should be withheld 48–72 hours before testing.
Dose: 10 mgDuration: Acute (single dose effect on assays)
Forms
Capsule / tablet
Tell clinicians before lab tests
Stacks containing Biotin (Vitamin B7)
Public community stacks that include this ingredient.
womens-health
Hair + Nails Reality Check Stack
by@athlete
Minimalist approach that focuses on likely gaps & avoids mega-dosing trends.
Biotin (Vitamin B7)
2mg
Vitamin C
500mg
Zinc
15mg
New