Revitalize Your Skin: The Benefits of Copper Peptide for Youthful Glow Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms Now introducing one of my favorite peptides.. GHK Cu This is a naturally occurring copper peptide your body already uses to repair and regenerate skin. As we age, those levels decline and that's By age 30, your skin produces about 25% less collagen. By 40, that number can reach 40%. This decline affects more than just how your skin looks. It changes how it heals,