Nicotinamide mononucleotide ("NMN" and "β-NMN") is a nucleotide derived from ribose and nicotinamide.

Niacinamide (nicotinamide) is a derivative of vitamin B3, also known as niacin. As a biochemical precursor of NAD+, it may be useful in the prevention of pellagra.

Its precursor, niacin, is found in a variety of nutritional sources: peanuts, mushrooms (portobello, grilled), avocados, green peas (fresh), and certain fish and animal meats.

In studies on mice, NMN has shown to reverse age-related arterial dysfunction by decreasing oxidative stress. A long-term study indicates that NMN can slow down the physiologic decline in ageing mice. As a result, the older mice in the study have metabolism and energy levels resembling those of younger mice, with extended life spans. However, NMN did not show similar beneficial effects in young mice.