Is Less More? Influence of the Coordination Geometry of Copper(II) Picolinate Chelate Complexes on Metabolic Stability Inorganic Chemistry 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 GHK Cu Copper Peptide: The Complete Research Guide CertaPeptides N2 (N Glycyl L histidyl) L lysinato(2 )]copper 89030 95 5 wiki GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link