Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 NL GHK Cu (TETRAPEPTIDE + CU) Synthagen Synthagen PL Reddit asked questions. Here are answers. GHK Cu isn't newit's just not heavily marketed for hair (yet). Dr. Loren Pickart discovered it in the 70s. Decades of clinical research. Solid mechanism. We screwed 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