GHK Cu 100mg Canada Copper Peptide 99%+ HPLC Verified 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline 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