Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit GHK cu hard spots at injection site : r Peptides GHK Cu Injection GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? Subcutaneous Injection Sites and Instructions for Safe Self Administration 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,