GHK Cu 99%+ Pure Peptide Amino Club Amino Club 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 Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum 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 50mg OP Labs (Formerly Oxford Peptides) Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms