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 Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect Absolute GHK cu Stem Cells & Peptide Hair Growth Serum and Shampoo MTS Mall of California Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience