Buy GHK Cu Peptide 99%+ Purity GHK Cu for Research 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 N2 (N Glycyl L histidyl) L lysinato(2 )]copper 89030 95 5 wiki
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