Retatrutide Injection Site Pain: Causes and Solutions 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 Copper Peptide: The Ultimate Peptide For Longevity Managing Post Injection Pain After a Week GHK Cu HGH & Peptides Deus Medical What is a GHK CU Injection? Benefits and Uses Prime IV