NMN, full name: β-nicotinamide single nucleotide,pH value is 3.0-4.0, is a naturally occurring bioactive nucleotide, exists in a variety of organisms, is also the raw material of cosmetics, color is white to yellowish, is crystalline powder, no obvious odor, need to be dried at room temperature and stored away from light, use time is 24 months, The chemical formula is C11H15N2O8P, which is the key intermediate in the synthesis of coenzyme I - NAD+. NMN is an intrinsic substance in the human body and is also abundant in some fruits and vegetables.