POLYMORPHIC NMNH

NMNH (dihydronicotinamide mononucleotide) is a reduced form of NMN - it differs in that it has an extra hydrogen on the nicotinamide moiety (analogous to NADH vs. NAD+). This minor chemical change leads to different biochemical dynamics. In the body, normal NMN (nicotinamide mononucleotide) is metabolized within the NAD+ salvage pathway to NAD⁺ (the oxidized form), whereas NMNH is the precursor of the reduced form of NADH. The key enzyme is nicotinamide mononucleotide adenylyltransferase (NMNAT), which attaches adenine (from ATP) to both NMN and NMNH; in the case of NMNH, this produces NADH. NMNH has been shown to increase NAD⁺ levels significantly more than equivalent amounts of NMN, both in cell culture and in experimental animals. At the same time, NADH (reduced NAD) levels are increased in cells and tissues (e.g., mouse liver), indicating efficient conversion of NMNH to usable forms of nicotinamide adenine dinucleotide.

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