GHK is a copper peptide that occurs naturally in a copper complex of the tripeptide glycyl-L-histidyl-L-lysine. It has two variants — GHK with or without Cu. GHK appears to have a strong affinity for copper (II), and it is synthesized naturally from plasma, although it has been isolated in other areas. In cases of injury, GHK may be released from tissue cells. The copper peptide appears to affect genes that control injury and stress responses. Its functions appear to include the following: tissue remodeling, anti-inflammatory response, pain perception inhibition, nootropic action anti-cancer action, blood vessel growth, and nerve outgrowth. A decrease in the regenerative capacity of an organism may be traced to a decline in GHK-level. Its potential functions extend to infection control, follicle growth, collagen and elastin production increases, tissue repair, and glycosaminoglycan synthesis. Endogenous GHK production is considered to decline over time.[1]
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