NMN Stabilized Form 320mg NAD+ Supplement CapsulesWhy Choose NMN (Nicotinamide Mononucleotide) from Nature4U Supplements? NMN (Nicotinamide Mononucleotide) is the precursor for NAD+ and is able to promote cellular NAD+ production. It was recently discovered that NMN enters the cells through the Slc12a8 membrane protein which is specifically able to transport NMN but not nicotinamide riboside (according to studies performed on mice). As we age, NAD+ levels begin to decline. NAD+ is required for proper