Nicotinamide Mononucleotide (NMN) is a nucleotide derived from niacin (vitamin B3) that plays a crucial role in cellular energy metabolism and the repair of damaged DNA. It serves as a precursor to nicotinamide adenine dinucleotide (NAD+), a vital coenzyme in all living cells involved in numerous metabolic processes. As organisms age, NAD+ levels decline, leading to a reduction in cellular vitality and an increase in age-related degenerative diseases. NMN supplementation has been identified as a potential strategy to increase NAD+ levels, thereby enhancing energy metabolism, improving mitochondrial function, and potentially delaying the aging process and mitigating the risk of chronic diseases. Research in animal models has shown promising results, including improved age-related biomarkers, enhanced muscle endurance, better glucose metabolism, and protection against neurodegenerative diseases. These findings have sparked considerable interest in NMN as a dietary supplement to promote health and longevity, although more research is needed to fully understand its effects in humans.