Nicotinamide adenine dinucleotide, also known as coenzyme I, is a core coenzyme for living cells, in the active form of vitamin B3, and can be synthesized greenly through synthetic biology.

Its core function is cellular-level anti-aging. Its mechanism involves increasing intracellular NAD+ concentration, activating mitochondrial energy metabolism and longevity proteins, participating in DNA repair, regulating oxidative balance, and delaying cellular aging. It also repairs the skin barrier, provides antioxidant benefits, brightens skin tone, is compatible with various anti-aging skincare formulas, has good biocompatibility, and is non-irritating, making it a core anti-aging ingredient in the high-end skincare field.