Biotin by NOW Foods is a supplement of biotin, vitamin H also called b7, which supports the metabolism of amino acids and promotes a healthy function of the immune system. It plays a vital role in skin and hair health. NOW Foods Biotin 10mg 120 vcaps Biotin is a member of the B-vitamin family. Biotin is a water-soluble vitamin necessary for normal growth and body function. Biotin is a key regulatory element in gluconeogenesis, fatty acid synthesis, and in the metabolism of some amino acids. Alongside its role in energy production, Biotin enhances the synthesis of certain proteins. In addition, Biotin promotes normal immunity and plays a critical role in skin, nails and hair health.