Biotin

Biotin, also known as vitamin H or coenzyme R, is a water-soluble B-vitamin (vitamin B7).

It is composed of a ureido (tetrahydroimidizalone) ring fused with a tetrahydrothiophene ring. A valeric acid substituent is attached to one of the carbon atoms of the tetrahydrothiophene ring. Biotin is a coenzyme for carboxylase enzymes, involved in the synthesis of fatty acids, isoleucine, and valine, and in gluconeogenesis.

Read more about Biotin:  General Overview, Biosynthesis, Cofactor Biochemistry, Sources of Biotin, Bioavailability, Deficiency, Metabolic Disorders, Toxicity