Nicotinamide Mononucleotide (NMN) Powder Description Nicotinamide Mononucleotide (NMN) is a naturally occurring compound that is in small amounts in the human body as well as some foods. NMN is orally bioavailable, and when taken orally can support NAD+ levels within liver and muscle tissue. Recent research has suggested that NMN may support cardiovascular health, energy production, cognitive health, and well …