Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule Peptide Injection Site Reactions: What's Normal, What's Not, and What Revolution Health & Wellness GHK Cu Copper Peptide Skin & Healing Beverly Hills 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