File:Tropocollagen cross linkage lysyl oxidase (EN).svg Wikimedia Commons GHK Cu G Lab Peptides Can GHK Cu Copper Peptide Tighten Skin After Weight Loss? Elevated intracellular copper contributes a unique role to kidney fibrosis by lysyl oxidase mediated matrix crosslinking Cell Death & Disease Site specific cross linking of collagen peptides by lysyl advanced glycation endproducts Chemical Communications (RSC Publishing) Everyone's calling GHK Cu a miracle peptide But let's separate marketing from mechanism. GHK Cu isn't magic. It's a signal. A signal that: Supports tissue repair Modulates inflammation Enhances collagen +