GHK Cu Copper Tripeptide 1 Research Reagent Revitalize Your Skin: The Benefits of Copper Peptide for Youthful Glow GHK cu is a copper peptide. It's great for skin, especially when you combine it with other things. My favorite is DMSO and derma rolling. My first experience with copper peptides was Procytes GHK cu is a copper peptide. It's great for skin, especially when you combine it with other things. My favorite is DMSO and derma rolling. My first experience with copper peptides was Procytes