What is NMN? You may not have heard of it but it offers exciting health benefits. NMN—nicotinamide mononucleotide—is a form of vitamin B3 that is a direct precursor to NAD+. NAD+ is essential for enzymatic activities that maintain cellular and tissue health. As levels of NAD+ naturally decline with age, other concerns arise, including cognitive and metabolic health. While supplemental NAD+ is not readily absorbed by the body, adding precursors such as NMN has been shown to increase NAD+ levels to promote healthy aging. Swanson NMN can help maintain healthy levels of NAD+ in the body. Each single-capsule serving delivers 300 mg of 98% pure nicotinamide mononucleotide. Adding an NMN supplement to your routine may support healthy metabolism and glucose levels as well as healthy insulin sensitivity, particularly in postmenopausal women.