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, How to Measure and Inject GHK Cu (Copper Peptide for Skin and Tissue Repair) YouTube A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend Injectable GHK Cu: Beginner's Guide to Copper Peptide Compounds Doc Protocol