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 Copper Tripeptide For Thinning Hair Regrow Serum Essence Oil DHT Blo Collagen Tripeptides Two Ingredients. Real Hair Transformations. How Neurogan Health's GHK Cu Serum Is Changing What Customers Expect From Hair Care If your hair has been thinning, shedding, or just not growing like it used to meet GHK Cu (copper peptide) , This tiny peptide is one of the most underrated hair regrowth ingredients out there