Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum If you've been down the GHK Cu rabbit hole, you already know. If you haven't, welcome. This is the ingredient that skincare nerds, dermatologists, and anti ageing enthusiasts have been talking about for years. Peptides: The growing W E L L N E S S trend that everyone is talking about! You may have heard about BPC 157 and GHK Cu two peptides gaining attention in GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health GHK Cu Peptide Progress: Week 3 Results