A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend Oral Liposomal Copper GHK Liposomal GHK Cu Supplement Liposomal Copper GHK Oral Peptide Supplement 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 Peptide Serum for Glowing Skin