What is NMN?
Nicotinamide mononucleotide
NMN is a small molecule your body converts directly into NAD⁺, the helper molecule cells need to make energy and run repairs.
If NAD⁺ is a finished delivery van, NMN is the van arriving at the factory almost fully assembled. The cell just bolts on the last part and it's ready to drive.
Why it matters for aging
Your body makes NMN naturally as one of the last steps in producing NAD⁺. Small amounts also occur in foods like broccoli, cabbage and edamame, far below supplement doses.
NMN became popular after mouse studies suggested it could improve age-related decline in energy and metabolism. In humans, studies so far are small and short. NMN is lawful to sell as a dietary supplement in the US after the FDA reversed an earlier restriction in 2025.
A common myth
Taking NMN reverses aging.
NMN reliably raises NAD⁺ levels in human trials, and one small trial found better insulin response in muscle. But there's no evidence yet that it slows aging or boosts energy in healthy people.
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Updated Nov 9, 2026 · All terms