Does it work? Maneup GHK Cu hair growth serum : r tressless GHK Cu Hair Growth Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum 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