Stacking nicotinamide mononucleotide and nicotinamide riboside creates a powerful synergistic effect for increasing NAD+ levels. These complementary NAD+ precursors work through separate metabolic routes to maximize cellular energy production. While NMN works through the Slc12a8 transporter, NR engages alternative conversion routes. This strategic pairing counters age-related NAD+ decline while enhancing longevity pathways.