Advancing diabetic wound care: The role of copper containing hydrogels: Heliyon Effects of GHK Cu on MMP and TIMP Expression, Collagen and Elastin Production, and Facial Wrinkle Parameters Peptide Therapy for Skin Rejuvenation LIVV Natural 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