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 (50mg) Nordsci GHK Cu Peptide 100mg For Copper Binding Research Theoretical study of copper binding to GHK peptide ScienceDirect
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ghk-cu copper coordination geometry Is Less More? Influence of the Coordination Geometry of Copper(II) Picolinate Chelate Complexes on Metabolic Stability