What is GHK Cu and Why is Everyone Talking About It? GHK Cu (Copper Peptide) is a powerful, naturally occurring compound in the body that plays a key role in skin health Copper Peptides Before and After: Visible Skin Improvements Explained Hubmed 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 you're Peptide Injection Site Reactions: What's Normal, What's Not, and What Revolution Health & Wellness