BiotinPure Encapsulations Biotin 8mg is a high potency B vitamin supplement providing 8000mcg of biotin per capsule. This water soluble vitamin B7 serves as an essential cofactor for metabolic carboxylation reactions that support healthy hair, skin, nails, and nervous system function. Biotin works by supporting carboxylase enzymes including pyruvate carboxylase for glucose metabolism, acetyl CoA carboxylase for fatty acid oxidation, and other enzymes