Cu Peptide Before and After: What to Expect for Skin and Hair Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 Two Ingredients. Real Hair Transformations. How Neurogan Health's GHK Cu Serum Is Changing What Customers Expect From Hair Care Morningstar 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 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