Professional The results speak for themselves. GHK Cu Peptide Serum by NanoSkin. Copper peptides, deep hydration and barrier support, all in one daily serum. Your skin deserves this. Facebook Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 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 Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Jumbo Size