GHK Cu Copper Peptides: Topical vs Injectable 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 PSA] Finally, a Dr. explains the mechanism behind the "copper uglies" : r SkincareAddiction Can GHK Cu Be Taken Orally? Oral GHK Cu Bioavailability, Tablets & Copper Peptide Safety Neurogan Health GHK Cu Cooper Peptide: The Complete Skin & Repair Guide (2026)