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 100MG SSP Research GHK Cu Copper Tripeptide 1 Research Reagent HAIRgevityPro GHK Cu Copper Binding Tripeptide Complex True Research Labs 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