Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience Ingredients Hairgenetix GHK Cu, AHK Cu & PDRN Peptides El GHK Cu (Copper Peptide) for Hair Supports healthier, stronger looking hair Helps nourish the scalp and hair follicles Promotes thicker, fuller appearance Encourages improved GHK Cu Copper Peptide Scalp Therapy 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 Hair Growth Serum Proven Copper Peptide, $299