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 Does it work? Maneup GHK Cu hair growth serum : r tressless Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience GHK CU Hair Loss & Regrowth Treatment Therapy Vitality Health Copper Peptide Hair Growth Conditioner GHK Cu for Hair Loss Hairgenetix