GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution I took a serious turn last year towards peptide derived skincare. It changed my skin in all the best ways I didn't even imagine. When I started GHK Cu (copper peptide) injections 3 GHK Cu (glycyl l histidyl l lysine copper) is a powerful peptide that binds with copper to promote skin regeneration and repair. It works by: Stimulating collagen & elastin production Helps firm and smooth the skin. Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum