A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu for Skin: SIGNAL's Guide to Rejuvenation GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 6 month GHK CU check in Main takeaway: skin transformation takes time. GHK CU peptide binds to copper and activates genes involved in wound healing, collagen synthesis, and skin remodeling. On the face, this translates GHK Cu for Skin Rejuvenation WeCare Pharmacy