GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Chemical structures of GHK and its copper and palmitoylated (Pal) Download Scientific Diagram Your copper peptide product should be this exact blue. If it isn't, you already have your answer. GHK Cu is blue because of coordination chemistry, not dye. The Cu ion at the center Copper tripeptide 1.xHOAc 89030 95 5 FC180071