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, Copper peptides like GHK Cu work by sending signals to your skin to repair, regenerate, and produce collagen. It's not about instant results, it's about improving how your skin functions over time. Dr. What is GHK Cu? LIVV GHK Cu: The Regenerative Peptide for Skin, Hair, and Healing Pulse & Remedy The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline