GHK CU Copper Peptide, Face Serum, 1 oz (30 ml) You started using a GHK Cu peptide serum on your face and now , The things no one tells you., Yes, the injections can hurt like a bitch. , Heres the thing Ive found it works even better topically, GHK Cu Copper Tripeptide 1 Research Reagent 7% GHK Cu Cosmetic Ingredient Accelerant Skin Biology 15 ml MorNatural What is a GHK CU Injection? Benefits and Uses Prime IV