Teen Boys and Young Men Are Injecting Peptides in Search of Perfection WSJ Copper Peptide (GHK Cu): Clinical Uses, Stability & Compounding Tips Most people think they need to take copper peptides. But Your body already produces its own copper peptide called GHK Cu. But levels naturally decline with age. So Instead of trying to replace Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy