You'll notice if you stop; that's what happened to me when my NMN went on back-order and stopped for 8 days. Like metformin NMN doesn't produce any significant

You'll notice if you stop; that's what happened to me when my NMN went on back-order and stopped for 8 days. Like metformin NMN doesn't produce any significant immediate noticeable effect like Alpha-GPC for example; it's more like working out - overtime the long-term effects are significant. At least that's the hope. I buy my NMN in a month supply at a time (150 a month).