Copper Peptide Hair Growth Shampoo GHK Cu for Hair Loss Hairgenetix Glow from within with GHK Cu Copper Peptide , This powerhouse peptide supports collagen production, skin repair, and hair follicle health, helping improve skin firmness, radiance, and support 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 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care