GHK Cu Peptide Progress: Week 3 Results GHK Cu Topical Gel Transparent Peptides Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum 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 Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule