Nicotinamide mononucleotide (NMN) is a nucleotide derived from ribose and nicotinamide, and it serves as a precursor to nicotinamide adenine dinucleotide (NAD+), a vital molecule involved in energy metabolism, DNA repair, and cellular function. As dogs age, levels of NAD+ tend to decline, which can impact their overall health and vitality. Research in geroscience suggests that replenishing NAD+ through NMN supplementation may help mitigate some age-related decline and support healthier aging processes in dogs. Studies in other species have shown promising results, with NMN potentially improving aspects of metabolic health, enhancing physical activity, and even influencing cellular repair mechanisms. While research specific to dogs is still emerging, the implications for canine longevity are intriguing. By supporting the cellular machinery that keeps our pets vibrant and active, NMN could become a valuable tool in promoting a longer, healthier life for our furry companions.