Nad is also called
Nicotinamide Adenine Dinucleotide. (NAD; also called diphosphopyridine nucleotide, or DPN; obsolete terms, cozymase, coenzyme I, and codehydrogenase I), a coenzyme present in all living cells. NAD is a member of a group of enzymesâthe dehydrogenasesâthat catalyze oxidation-reduction reactions.