A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend Advances in Peptide Based Chimeric Strategies for Targeted Protein Degradation Journal of Medicinal Chemistry PDGF injections are trending fast online, but many patients are not being told the full story including that most PDGF products were never FDA approved for injection into the face. We're now seeing Copper peptides explained what are the differences between copper peptides and GHK CU peptides? What they actually do for the skin in terms of repair and collagen, and what you can and cant mix