A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend 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, PSA] Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r SkincareAddiction GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B