NAD+ is a major electron acceptor molecule in biological oxidations. Acts as a coenzyme for hydride-transfer enzymes and a substrate for NAD(+)-consuming enzymes, which include ADP-ribose transferases, poly(ADP-ribose) polymerases, cADP-ribose synthases and sirtuins. Recently reported to be a P2Y11 agonist. MW: 663.43. Purity ≥98% by HPLC