NMN and NR together create a synergistic approach to increase NAD+ levels. These NAD+ precursors work through different pathways - nicotinamide riboside utilizes NRK1 NRK2 enzymes while nicotinamide mononucleotide skips certain conversion steps. This NMN NR synergistic effect optimizes mitochondrial function and facilitates sirtuin activation. As NAD+ deficiency advances, this strategic combination combats multiple factors of healthy aging.