Difference between Biotin and D-Biotin?

D-Biotin is a water-soluble enzyme cofactor that is present in trace amounts in every living cell. It binds primarily to proteins or peptides and is abundant in liver, kidney, pancreas, yeast and milk. Biotin, also known as vitamin B7, is u

Biotin is an organic heterobicyclic compound that consists of 2-oxohexahydro-1H-thieno[3,4-d]imidazole having a valeric acid substituent attached to the tetrahydrothiophene ring.

D-biotin is the naturally occurring, biologically active form of the B vitamin biotin. It's involved in lipid, protein and carbohydrate metabolism.