Peptide Injection Reactions: Why Redness and Lumps Happen (And How to Fix Them) Do you get injection site reactions from your GHK CU? , 3 tips to make it better, Room temp , Use a different injection site , Inject the medication sloowwwly , All in all even with injection Recent post responses making me question if my reactions are normal. Worried! : r Peptides 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