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 NL GHK Cu (TETRAPEPTIDE + CU) Synthagen Synthagen PL Parents & teen athletes: not everything trending on social media is safe., Copper peptides like GHK Cu are being promoted for skin health, but these products are unregulated and not FDA approved, GHK Cu Peptide: What It Does for Body Composition and Metabolic Health