The human blood tripeptide GHK possesses many positive effects but declines with age.  It improves wound healing and tissue regeneration (skin, hair follicles, stomach, intestinal lining, and boney tissues), increases collagen, and glycosaminoglycans, stimulates the synthesis of decorin, increases angiogenesis, and nerve outgrowth, possesses antioxidant and anti-inflammatory effects, and increases cellular stemness and the secretion of trophic factors by mesenchymal stem cells.