Stacking both NAD+ precursors creates a dual-pathway strategy for boosting NAD+ naturally. These dual supplements work through different biosynthesis pathways to optimize mitochondrial function. While nicotinamide mononucleotide employs the direct cellular uptake, nicotinamide riboside triggers NRK1 and NRK2 enzymes. This NMN NR combination effectively combats cellular NAD+ deficiency while promoting SIRT1 function.