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Beta-Nicotinamide adenine dinucleotide (NAD+) is a dinucleotide coenzyme composed of adenosine monophosphate and nicotinamide mononucleotide linked by a phosphoanhydride bond, serving as an obligate hydride-transfer cofactor in cellular redox chemistry. It is investigated in preclinical and in-vitro model systems as a substrate and regulator across sirtuin, PARP, and CD38 / cyclic-ADP-ribose signaling research contexts.