Best Selling Skin Care Anti Aging Anti Wrinkle Repairing Firming Ghk Cu Blue Copper Peptide Serum GHK CU ELIXR IV Therapy The GHK Cu Peptide: Benefits, Uses, and Why it's Known as the Regenerative Copper Complex 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 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, Synergy of GHKCu and hyaluronic acid on collagen IV upregulation via fibroblast and exvivo skin tests Jiang 2023 Journal of Cosmetic Dermatology Wiley Online Library