GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect Copper Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience 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 Copper Peptide: The "Glow" for Hair & Skin Seenergie PH 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper