NAD, or nicotine adenine dinucleotide, probably needs no introduction. Together with its primary alter-egos NADH, NADP and NADPH, our private suite of pyridine-based nucleotides serve as hydride donors in some 400 enzymatic reactions throughout the body. Beyond these signature dehydrogenase, hydroxylase and reductase reactions, other members of the larger NAD ecosystem function in receptor signaling pathways. Furthermore, the backbone NAD skeleton itself is extensively deployed in DNA repair, and directly consumed as additions to many other important molecules in different organelles.
source https://phys.org/news/2020-12-nad-nicotine-adenine-dinucleotide-super.html
