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 GHK Cu Copper Tripeptide 1 Research Reagent GHK Cu 50mg Modified Aminos GHK CU 100MG MOB Biotech 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. Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms