Unlocking the Secrets of GHK Cu: The Revolutionary Peptide for Youthfu What is the safe topical dosing, duration, and contraindications for the copperbinding peptide GHKCu for wound healing or antiaging? Time for a little GHK CU update for the people who are interested. Its day 9. I took a little break on day 5 just so my body didnt get too used to the peptides and Ill just keep going in this 5 Revitalize Your Skin: The Benefits of Copper Peptide for Youthful Glow Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy