GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect GHK Cu is getting a lot of attention right now, and for good reason. This is not just a skin peptide. It's a copper binding tripeptide with documented effects on gene expression, collagen synthesis, Regenerative properties of the NL GHK Cu peptide and skin appearance Synthagen PL