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 Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience I posted about GHK CU about two weeks ago and had a ton of people ask me questions about it in terms of how it works, but also asking about my personal experience. I am not done treatment yet, but in The hype is real. Ghk Cu aka the copper beauty peptide Does it work? Maneup GHK Cu hair growth serum : r tressless