Nicotinamide mononucleotide (NMN) is one of the intermediates in NAD+ biosynthesis. It plays a critical role in various biological processes, including metabolism, aging, cell death, DNA repair, and gene expression. The level of NAD+ declines with age. NMN supplementation restores NAD+ levels in maternally aged oocytes. It helps to enhance the maintenance of DNA repair and promotes vascular health and blood flow.