Wound healing activity of GHK-Cu was confirmed in animal experiments. GHK-Cu accelerated wound healing and increased blood vessel formation and the level of antioxidant enzymes in rabbits. This molecule also induced systemic wound healing in rats, mice, and pigs. It improved the healing of diabetic and ischemic wounds in rats, decreasing the level of TNF-alpha and stimulating collagen synthesis. It also facilitated healing of pad wounds in dogs [12–17]. Such well-documented skin regeneration activity prompted widespread use of GHK in antiaging cosmetic products .