Biotin
Vitamin
B vitamin marketed for hair, skin, and nail health.
Form: Tablet
Recommended intake: 30 µg/day
Benefits
Reverses true biotin-deficiency dermatitis; cosmetic benefits in non-deficient adults are modest.
Warnings
Can interfere with lab assays (especially thyroid and troponin tests). Inform your doctor if taking high doses.
Description
Biotin (B7) is a cofactor for carboxylase enzymes in fatty-acid and glucose metabolism. True deficiency is rare; mega-doses in cosmetic supplements lack strong clinical evidence.