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 Ghk Cu Copper Peptide: Uncover Its Full Potential Molecular crystal structure of the tripeptide GHK Cu. In solution, Download Scientific Diagram Theoretical study of copper binding to GHK peptide ScienceDirect
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