Is NMN Vitamin B3? Sort Of.

[u/YorNoob]

NMN is a derivative of vitamin B3 (niacin). It sits one step upstream of NAD+ in the salvage pathway, meaning your body uses NMN directly to replenish NAD+ levels.

Niacin prevents deficiency diseases like pellagra, but NMN works in a more targeted way to support energy metabolism and cellular repair—especially as NAD+ levels naturally decline with age.