Buy GHK Cu Exceptional 99%+ Purity Third Party COA Included Influence of the counterion on the geometry of Cu(I) and Cu(II) complexes with 1,10 phenanthroline ScienceDirect GHK Cu Copper Peptide: Evidence, Mechanisms & COA Guide Nootropix 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