Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference Copper, Collagen, and Controversy: Inside the GHK Cu Buzz