From a biochemist's perspective, NR holds an edge over NMN since cells cannot directly absorb NMN, and NMN must be converted to NR before entering cells. Thus, [NMN's greater popularity among consumers] may be attributed to the fact that NMN is a more direct precursor in the biosynthesis pathway of NAD+ when viewed from a layman's standpoint. This illusion, probably further fanned by the manufacturers, is responsible for the hyped demands and sales of NMN for consumers that causes more people to be exposed to NMN compared to other NAD+ precursors.