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, Buy high quality GHK Cu 50mg (copper peptide) from the UK's leading store Pure Peptides UK Dermaesthetics Copper Peptide Ghk Cu Serum Natural Editorialist Copper Peptide Serums GHK Cu & AHK Cu Nubeean Noosa