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: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration The research on GHK Cu goes back over 40 years a scientist dedicated his entire career to it. Your body already makes it. You just make about 60% less of it by GHK Cu Glow Peptide Stack for Skin Rejuvenation Jennifer R. Berman MD