Maintaining healthy NAD+ levels is crucial for supporting cellular energy, cellular and DNA repair, and Sirtuin (longevity genes) activity to fight the effects of aging. NAD+ is crucial in healthy brain, vasculature, liver, heart, muscle and pancreas function. NMN is the precursor to NAD+ and is readily converted to NAD+. 1 Life Science uses only the highest potency NMN for optimal benefit.