It's chemically one step closer to NR and NMN -- it's already the amide, just add the R and MN.

But it's also as useless at longevity in animal studies as plain niacin. Technically that's the same "effectiveness". Feeding in more raw material won't do so much when conversion to the active form is tightly regulated.

(Niacin lowers cholesterol via HCA2, something nicotinamide, NMN, and NR does not hit.)