Question: what is the difference between ground cinnamon and ceylon cinnamon?
Answer: Cassia cinnamon, but not Ceylon, is a very rich source of coumarin. Cassia contains approximately 1% coumarin, while Ceylon contains only 0.004%, or 250 times less. ... Therefore, if you regularly eat a lot of cinnamon or take a supplement that contains it, then it should be Ceylon and not cassia.