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 070 000 251 Copper Peptide GHK Cu, CAS 49557 75 7 Copper Peptide 49557 75 7 GHK Cu (100 MG) Sigma Compounds
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