NMNH (Reduced Nicotinamide Mononucleotide) is a reduced form of NMN, a well-known precursor to NAD⁺ (Nicotinamide Adenine Dinucleotide), an essential coenzyme involved in cellular energy metabolism and DNA repair. Compared to NMN, NMNH has been shown to more rapidly and effectively elevate NAD⁺ levels in cells and tissues. This enhanced efficiency makes NMNH a promising compound for research into aging, metabolic health, and neuroprotection, as maintaining NAD⁺ levels is associated with improved cellular function and resilience against age-related decline.