Our basic NMN 500mg Capsules contain a high concentration of nicotinamide mononucleotide extract in every serving for a 60-day supply. NMN is a precursor to NAD+, a key coenzyme in the human body that initiates many cellular processes, including energy metabolism, DNA repair, cell signaling, and gene expression. Many studies point to the advantages of just taking 500mg NMN as a supplement to boost NAD+ levels for healthy aging.