Skinworks GHK Cu will always be that girl One of my go to favorites right now is GHK Cu. Here's a little about it: GHK Cu is something your body actually produces naturally and A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend Good skin starts with the right ingredients. We made the GHK Cu Peptide Serum for people who want real results without the clinical experience. Copper peptides, hyaluronic acid, niacinamide and more, in one GHK Cu Peptide: What It Does for Body Composition and Metabolic Health