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 as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Buy GHK Cu Peptide Online in India Premium Copper Peptide Prime Human Labs Molecular structure of the tripeptide GHK Cu. In solution lysine Download Scientific Diagram GHK Cu Peptide for Regenerative Signaling and Tissue Repair Noelle Diamond, RDN, MA posted on the topic LinkedIn