Copper Peptide GHK CU Serum, Raw Aloe , 4% Hyaluronic Acid Anti Wrinkle 1 fl oz eBay The Blue Revolution: Why 1% Pure GHK Cu is the New Standard for Mature Pure & Cimple GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu Copper 1% Tripeptide Serum with Hyaluronic Barbados Ubuy 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