GHK Cu Copper Peptide: The Ultimate Peptide For Longevity What Is GHK Cu? Discovery & Research Honest Peptide Skinworks GHK Cu will always be that girl One of my go to favorites right now is GHK Cu. Here's a little about it: GHK Cu is something your body actually produces naturally and 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: What It Does for Body Composition and Metabolic Health