Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum eBay GHK Cu is a copper peptide known for supporting skin repair, collagen production, and overall tissue healing., Traditionally, its taken as an injection but that can come with irritation, bruising, or 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK week 3 of using GHK Cu peptide pin. If I take a photo with the same lighting? How much of a difference do you think there will be? #ghkcu #peptide #look #looksmaxing #glowup