NMN (nicotinamide mononucleotide) replenishes NAD+, enabling SIRT6-mediated DNA repair (preventing the DNA damage that triggers senescence), SIRT1-mediated SASP gene suppression (reducing SASP output from existing senescent cells), and SIRT3-mediated mitochondrial quality control (preventing mitochondrial dysfunction that induces senescence). NMN addresses upstream causes of senescence without directly eliminating senescent cells.

Does NMN reduce senescent cell numbers?

Indirectly. By maintaining DNA repair capacity (via SIRT6/PARP) and reducing senescence induction rate, NMN lowers the rate of new senescent cell formation. It does not directly kill existing senescent cells.

Is NR as effective as NMN for these anti-senescence benefits?

NR (nicotinamide riboside) raises NAD+ via the same salvage pathway as NMN. At equivalent NAD+-raising doses, the downstream SIRT6/SIRT1/PARP benefits should be similar. NR and NMN differ in transport mechanisms but comparable NAD+ elevations are achievable with both.