GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu is getting a lot of attention right now, and for good reason. This is not just a skin peptide. It's a copper binding tripeptide with documented effects on gene expression, collagen synthesis, Ghk Cu Powder Etsy GHK Cu Research Peptide: 4,000 Genes. One Tripeptide. 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