What is the safe topical dosing, duration, and contraindications for the copperbinding peptide GHKCu for wound healing or antiaging? GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 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. Oral Liposomal Copper GHK Liposomal GHK Cu Supplement Growth Hormone and Aging Endotext NCBI Bookshelf