Copper Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience GHK Cu 10 g (10% Concentrate, 100,000 ppm) Lrak Technologies This compound has been studied for over 50 years. Most people discovered it last year on social media. In 1973, Dr. Loren Pickart identified GHK Cu while studying why young blood could 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 Biotin Peptide Serum Organic Anti Aging & Hair Growth