Using both NMN and NR in combination offers a comprehensive method to elevate cellular NAD+ concentrations. These dual biosynthesis enhancers work through distinct absorption mechanisms - nicotinamide riboside activates NRK1 and NRK2 enzymes while nicotinamide mononucleotide bypasses certain conversion steps. This strategic combination promotes optimal cellular energy production, supporting the activation of sirtuins and PARP enzymes.