Hair Growth Serum Intense with Copper Peptide GHK Cu Copper Peptides Before and After: Visible Skin Improvements Explained Hubmed GHK Cu: My secret weapon for skin, hair, and healing, I use it two ways topical cream for my face, and subQ injections 3x a week., It boosts collagen, tightens skin, helps hair grow, and even PSA] Finally, a Dr. explains the mechanism behind the "copper uglies" : r SkincareAddiction