GHK Cu Copper Peptide: The Ultimate Peptide For Longevity Ever heard of GHK Cu peptide? It's a naturally occurring copper peptide that helps repair tissue, stimulate collagen, and support skin healing. When used in injectable form, it works at a deeper level In Vitro and in Vivo Studies of pH Sensitive GHK Cu Incorporated Polyaspartic and Polyacrylic Acid Superabsorbent Polymer ACS Omega Injectable GHK Cu: Beginner's Guide to Copper Peptide Peptide Injections: What They Are, What They Promise, and the Big Unknowns