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 Professor Dr Patrick Treacy has cautioned against the current hype surrounding peptides, emphasizing that aesthetic medicine must remain grounded in solid clinical evidence rather than marketing The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu Peptide: What It Does for Body Composition and Metabolic Health