NAD+ is a core cellular coenzyme involved in redox reactions, mitochondrial metabolism, and several signaling enzymes such as sirtuins and PARPs. It is not a peptide, so it is not described as one. NAD+ is a laboratory compound studied for energy metabolism and DNA-repair-related pathways.
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Researchers usually study NAD+ in relation to mitochondrial function, cellular energy metabolism, stress response and DNA-repair-related biology. Supplied for laboratory research use only.