Cu Peptide Before and After: What to Expect for Skin and Hair GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Epigenetic mechanisms activated by GHK Cu increase skin collagen density in clinical trial EurekAlert! GHK Cu Revival Clinic 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