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 peptide GHK Cu Tripeptide Proteasome Bortezomib, angle, white png PNGEgg GHK Cu Peptide 100mg For Copper Binding Research Copper tripeptide (GHK Cu; Copper Glycyl histidine tripeptide) CAS 89030 95 5 AbMole BioScience Copper tripeptide Price