GHK cu is a copper peptide. It's great for skin, especially when you combine it with other things. My favorite is DMSO and derma rolling. My first experience with copper peptides was Procytes Electrophoretic deposition of GHK Cu loaded MSN chitosan coatings with pH responsive release of copper and its bioactivity ScienceDirect DMSO Explained Why We Mix It With (GHK Cu) Copper Peptides Topic THE SURPRISINGLY EFFECTIVE DMSO + COPPER PEPTIDE CREAM! http: store.reverseskinaging.com 3_3_GHK_Cu_Body_Soothing_Cream_p 65.htm What Makes This Product Different: Soothe tired, lax skin on the body with this product that is the first of its kind! Dr.