GHK Copper Peptide GHK Cu Tripeptide 1 GHK Cu Peptide: What It Does for Body Composition and Metabolic Health Same GHK Cu. Better way. Same GHK Cu copper peptide complex. Completely different experience. If you've been eyeing the pen, put it down. We made something better, and your skin barrier will thank you Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference