Tripeptide-1 is also called oligopeptide-1, one of the oligopeptides, also called dermal growth-promoting factor. It exists naturally in human blood and saliva. It is an oligomer formed by the condensation of histidine, glycine and lysine. It mainly acts on the dermis of the skin, can promote the synthesis of extracellular matrix such as collagen and glycosaminoglycans, strengthen the dermis, make the skin thicker and firmer, relieve wrinkles, and have a stronger ability to resist ultraviolet radiation.