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 : . Dr. Shintre breaks down what it is and why it works. ? A copper based peptide that naturally occurs in your GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Copper Peptide Hair Growth Conditioner GHK Cu for Hair Loss Hairgenetix