Amazon.com : GHK Cu Copper Peptide Powder, CAS 49557 75 7, Purity 99+%, 1 Gram : Health & Household GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true?, Copper peptide, known as GHK Cu, has a growing body of peer GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu: The Peptide That Supports Healthy Aging GHK Cu (copper peptide) is naturally occurring in the body and plays a role in supporting skin health, collagen production, and tissue repair. As