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 Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule In Vitro and in Vivo Studies of pH Sensitive GHK Cu Incorporated Polyaspartic and Polyacrylic Acid Superabsorbent Polymer ACS Omega GHK Cu Copper Peptide Regeneration, Skin Renewal & Anti Age