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 Geometry of the (a) four , (b) five , (c) five and (d) six Download Scientific Diagram Buy GHK Cu 50mg, 75mg, 100mg Peptides.GG GHK Cu 50mg Copper Peptide Research Spartan Peptides
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ghk-cu copper coordination geometry Coordination geometry of the copper(II) peptide core obtained by QM/MM