How to Measure and Inject GHK Cu (Copper Peptide for Skin and Tissue Repair) YouTube 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 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 GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution