We've been talking a lot about GHK Cu, but there's always more to learn. Most people think of it as a hair and skin peptide and this is true. But there is GHK Cu Peptide Benefits for Skin and Hair LIVV Natural Ghk Cu Shampoo Copper Peptide Hair Growth Best Peptide for Hair Growth Copper Peptide Shampoo Hair Rescue: Repair is a combination of two potent peptides, GHK Cu and Zn Thymulin. In studies, GHK Cu has been shown to strengthen existing hair by stimulating growth in areas that lack thickness. Zn Thymulin