Nicotinamide mononucleotide (NMN) is a nucleotide derived from ribose and nicotinamide. Nicotinamide (a derivative of vitamin B3) is a precursor of NAD+. A long-term study indicates it can slow down the physiologic decline in ageing mice. NMN is a 1 Step NAD Precursor and does not require ATP to convert itself into NAD. Each serving (2 capsules) has 250mg of Nicotinamide Mononucleotide.