GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu is one of my personal favorites for a lot of reasons, but I can say without a doubt that it's use effectively stopped and reversed, my receiving hairline. However, there are GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia Dimeric copper peptide incorporated hydrogel for promoting diabetic wound healing Nature Communications