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 Peptide Therapy for Pain Management and Healing Core Medical & Wellness The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Dimeric copper peptide incorporated hydrogel for promoting diabetic wound healing Nature Communications GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia