GHK CU Beverly Hills Rejuvenation Center GHK Cu: The Copper Peptide That May Boost Skin, Hair and Healing Unfiltered Copper Peptide Uglies: How I Fixed My Dull, Sagging Skin with Hoygi Blue Copper Peptide Serum 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,