You can buy niagen, which has nicotinamide riboside (NR), which is basically the same thing - the goal is to increase NAD+ in the mitochondria. NR is an immedia

You can buy niagen, which has nicotinamide riboside (NR), which is basically the same thing - the goal is to increase NAD+ in the mitochondria. NR is an immediate precursor to NMN which is NR with an added phosphate group, which makes NMN itself unlikely to enter any cell directly. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7352172/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7352172/