It comes from the bark of cinnamon trees ... Ceylon cinnamon (also known as Cinnamomum verum and true cinnamon) and cassia cinnamon (also known as Cinnamomum cassia and Chinese cinnamon).
Either way, it's made of the dried bark of cinnamon plants ... heights under the right conditions. For instance, Cinnamomum zeylanicum, from Fast Growing Trees (also known as 'true cinnamon ...