Nicotinamide nucleoside is the precursor of nicotinamide adenine dinucleotide (NAD) and represents the source of vitamin B3. Recent studies have shown that new health benefits can be obtained by ingesting more nicotinamide nucleosides than naturally existing in food. Nicotinamide mononucleotide plays an important role in human cell energy production. It participates in the synthesis of intracellular NAD (nicotinamide adenine dinucleotide, an important coenzyme of cell energy transformation).