Vitaday - Biotin 1000 mcg - Also called Vitamin B7, 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. Biotin also encourages hair, skin, and nail health.