Research chemicals known as peptides, many of them banned by the World Anti Doping Agency and some not approved for human use in the United States, are available with the simple click of GHK Cu is a regenerative peptide studied for its role in collagen support, tissue repair and inflammatory balance. As natural levels decline with age, interest in its broader biological impact continues to grow What Are Peptides Used For? Benefits, Uses, Side Effects & Natural Sources Xandro Lab 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper