What is GHK Cu Collagen and Elastin Support Neurogan Health 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 Is Less More? Influence of the Coordination Geometry of Copper(II) Picolinate Chelate Complexes on Metabolic Stability Inorganic Chemistry GHK Cu Copper Peptide: The Complete Research Guide CertaPeptides Copper peptide (GHK Cu) SIELC Technologies