Subcutaneous Injection Sites and Instructions for Safe Self Administration GHK Cu Copper Peptide Benefits, Uses & Safety Intra V The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline 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