GHK Cu 50 mg Copper Peptide Research Grade PRG GHK Cu 50mg Copper Tripeptide Research Compound 99% 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 Theoretical study of copper binding to GHK peptide ScienceDirect Buy GHK Cu Exceptional 99%+ Purity Third Party COA Included
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