GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Subcutaneous injection: Definition and what to expect Ultimate Guide to GHK Cu for Dogs: Benefits, Uses, Safety, & Applications iHeartDogs.com The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline does ghk cu peptide injection hurt Market Trends GHK Cu injections may cause reactions at the injection site 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