GHK Cu: Regenerative Signaling and Molecular Reprogramming Research English Version Peridico Digital Centroamericano y del Caribe GHK Cu 100mg Research Compound Australia 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 The copper(II) binding tripeptide GHK, a valuable crystallization and phasing tag for macromolecular crystallography