Doctors Best NMN delivers the energizing support you're looking for as part of your healthy aging regimen. Each serving provides 400 mg of nicotinamide mononucleotide (NMN), a naturally occurring molecule which serves as a direct precursor to nicotinamide adenine dinucleotide (NAD+). As we age, our bodies naturally become less efficient at producing NAD+, which can have an effect on energy metabolism and the health of our tissues at a cellular level. Doctors Best NMN provides a clinically studied supplement designed to support NAD+ production for more energy and long- term wellness.