VitaminNo.008
Biotin (B7)
Hair, skin & nails (marketed); energy metabolism.
Typical / RDA30 mcg
Upper limitNone set
EvidenceLimited
How to take it
Timing AnytimeFood OptionalForm High-dose pills common
What to know
Deficiency is rare, and hair/nail benefits only appear in people who are actually deficient. Notably, high-dose biotin can distort lab tests (thyroid, troponin).
Interactions & cautions
- Can cause false lab results — tell your doctor before blood tests.
Do you actually need it?
Rarely needed; stop several days before bloodwork.
Reference values: NIH Office of Dietary Supplements, adult general population. Educational information only — not medical advice. Confirm with a healthcare professional.