Electrophoretic deposition of GHK Cu loaded MSN chitosan coatings with pH responsive release of copper and its bioactivity ScienceDirect Buy GHK Cu Peptide Online in India Premium Copper Peptide Prime Human Labs Buy GHK Cu Exceptional 99%+ Purity Third Party COA Included 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