GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect 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 Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum GHK Cu 50mg (Copper Peptide) Elite Bioscience Ghk Cu Shampoo Copper Peptide Hair Growth Best Peptide for Hair Growth Copper Peptide Shampoo