What is Ceylon Cinnamon ? Ceylon cinnamon (Cinnamomum verum), often called “true cinnamon,” is native to Sri Lanka. Unlike common Cassia cinnamon—which is thick, hard, and contains high levels of coumarin (a compound that can be toxic to the liver in large doses)—Ceylon cinnamon is composed of soft, paper-thin layers rolled into delicate, cigar-like quills. […]