GHK Cu (100mg) Research Peptide Kindred Aminos 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 GHK Cu Copper Tripeptide 1 Research Reagent GHK Cu 99%+ Pure Peptide Amino Club Amino Club