GHK Cu 50 mg Copper Peptide Research Grade PRG GHK Cu 50mg High Purity Research Peptide 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
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ghk-cu copper coordination geometry GHK-Cu Peptide 100mg For Copper-Binding Research