Copper Peptide Hair Growth Serum (GHK Cu & AHK Cu) GHK Cu for hair growth does it actually work? Short answer: no. GHK Cu can be great for skin but when it comes to hair growth, the evidence just isn't there. And this Ghk Cu Shampoo Copper Peptide Hair Growth Best Peptide for Hair Growth Copper Peptide Shampoo Ghk Cu Peptide Skin Hair Benefits Evidence GHK Peptide Hair Growth Clinical Trial (2016) Research Summary Hairgenetix Your skin is the largest organ in your body and anti aging is the name of the game! But, GHK cu is treating so much more than just wrinkles, this is for cellular health,