GHK Cu Peptide 100mg For Copper Binding Research 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 Influence of the counterion on the geometry of Cu(I) and Cu(II) complexes with 1,10 phenanthroline ScienceDirect GHK Cu Copper Tripeptide 1 Research Reagent Buy GHK Cu Exceptional 99%+ Purity Third Party COA Included Copper peptide GHK Cu Wikipedia