β-Nicotinamide adenine dinucleotide reduced dipotassium is an orally active reduced coenzyme. β-Nicotinamide adenine dinucleotide reduced dipotassium is a donor of ADP-ribose units in ADP-ribosylaton reactions and a precursor of cyclic ADP-ribose. β-Nicotinamide adenine dinucleotide reduced dipotassium plays a role as a regenerative electron donor in cellular energy metabolism, including glycolysis, β-oxidation and the tricarboxylic acid (TCA) cycle [1] .