GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not EFFECT OF GLY HIS LYS AND ITS COPPER COMPLEX ON TGF 1 SECRETION IN NORMAL HUMAN DERMAL FIBROBLASTS Trends in peptide drug discovery Nature Reviews Drug Discovery GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link