Young Goose Blue Peptide Spray 30ml Travel Size Longevity Essentials Copper peptides (GHK Cu) have been studied for decades for their role in tissue repair and that same biology applies to hair. Research shows GHK Cu may help strengthen existing hair follicles, reduce Should We All Be Using Copper Peptides for Our Skin: Reviews 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK Hasan Mirza, MD