Aesthetics Infinity Medical Institute Copper Peptides Elmhurst IL Chicago Accelerated Aesthetics The potential of GHK as an anti aging peptide GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes Ozark Have you heard of GHK Cu the copper peptide your body is already making? GHK Cu (Glycyl L Histidyl L Lysine Copper) is a naturally occurring tripeptide found in human plasma, saliva, and urine.