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 GHK Cu Injection Pen Australia Subcutaneous Copper Peptide Inject+ Peptides for Plastic Surgery Recovery: A Clinical Guide to GLOW, KLOW, and NAD Plus Frank Agullo, MD Subcutaneous Injection Sites and Instructions for Safe Self Administration Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms