NAD, the full name of nicotinamide adenine dinucleotide, is an important coenzyme that participates in a variety of metabolic processes in cells, such as energy production, DNA repair, and cell signaling.

NAD usually exists in two forms, NAD+ and NADH, which play an important role in electron transfer in cells.

NAD is an important coenzyme that participates in a variety of metabolic processes in cells and is essential for health. By supplementing NAD+ or NMN, the level of NAD+ in the body can be increased, thereby improving health and delaying aging.