Peptide Labz Copper Peptide Hair Growth Serum, 10% GHK cu, 5% AHK cu, Rejuvenates Follicles Walmart.com GHK Cu Peptide Benefits for Hair Growth Explained Hair Growth Serum Intense with Copper Peptide GHK Cu 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 Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz