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 Amazon.com: The Ordinary Multi Peptide + Copper Peptides 1%, GHK Cu Anti Aging Serum for Fine Lines and Skin Elasticity, 1 Fl Oz : Beauty & Personal Care GHK Cu is getting a lot of attention right now, and for good reason. This is not just a skin peptide. It's a copper binding tripeptide with documented effects on gene expression, collagen synthesis, GHK Cu Peptide: What It Does for Body Composition and Metabolic Health