One of the best known supplements in the anti-ageing world right now is NMN, short for Nicotinamide Mononucleotide. NMN is a precursor to NAD+ (nicotinamide adenine dinucleotide), a molecule that plays a crucial role in cellular energy production and DNA repair. As we age, NAD+ levels decline, which is linked to fatigue, slower metabolism, and increased risk of age-related diseases