Nature's lab - biotin 5000mcg - 120 capsules biotin is an essential b vitamin that plays a role in ing healthy hair, skin and nails. It's a water soluble vitamin that is not stored in the body and must be replacedbiotin acts as a coenzyme in the body to help metabolize fatty acids, amino acids and glucose. 5000mcg per serving supports hair, skin and nail health non-gmo gluten free. Nature's lab biotin 5000mcg healthy - 120 capsules (120 servings)