Epigenetic mechanisms activated by GHK Cu increase skin collagen density in clinical trial EurekAlert! The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline 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 Dimeric copper peptide incorporated hydrogel for promoting diabetic wound healing Nature Communications