Transform Your Skin: GHK CU Before & After Results Copper peptides explained what are the differences between copper peptides and GHK CU peptides? What they actually do for the skin in terms of repair and collagen, and what you can and cant mix Let's talk about one of my FAVORITE glow peptides: GHK Cu GHK Cu (Copper Peptide) is a naturally occurring peptide in your body that plays a HUGE role in healing, repair, and overall Copper Tripeptide (GHK Cu) for Advanced Skincare & Haircare Formulatio Can You Use GHK Cu Peptides with Vitamin C Serum? Expert Guide