In Vitro and in Vivo Studies of pH Sensitive GHK Cu Incorporated Polyaspartic and Polyacrylic Acid Superabsorbent Polymer ACS Omega GHK CU for Sale Tripeptide 1 3rd Party Tested US Made A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu (copper peptide) is actually something your body already makes when youre younger which is great, until it slowly starts disappearing., It basically tells your body to repair itself better.