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 GHK Cu Peptide Serum 30 ml, Copper Peptide Serum with Hyaluronic Acid for Tightening, Collagen Boosting Revitalize Your Skin: The Benefits of Copper Peptide for Youthful Glow Cellular Glow Copper Peptide GHK Cu Serum for Face