GHK Cu Copper Peptide: The Ultimate Peptide For Longevity GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Subcutaneous Injection: What It Is and How to Give One GHK Cu Research Peptide High Purity Canada XPeptides XPEPTIDES If your GHK injection site gets irritated try this , 1. Dilute it by adding more water to the syringe , 2. Let it sit until it reaches room temperature , Also, make sure youre rotating injection