GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B I've been getting a lot of questions about GHK Cu, so here's a quick breakdown. GHK Cu is a copper peptide that naturally occurs in the body and plays a role in skin repair GHK Cu is a small copper bound peptide (glycyl histidyl lysine with a copper ion) found naturally in human tissues and fluids. Its levels decline with age, and it plays a role in tissue repair, regeneration, Oral Liposomal Copper GHK Liposomal GHK Cu Supplement