GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia Private Label Ghk Cu Serum Copper Peptide Hair Growth Copper Peptide Serum for Hair Growth Peptide 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 Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL) GHK CU 50mg Vial Copper Peptide Pure Bio Labs Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum