Ceylon cinnamon or true cinnamon, as it is popularly known, originates from Sri Lanka. Dried inner bark of this tree is steam distilled or water distilled to produce oil. Unlike its more commonly available cousin Cassia, this species is contains very little naturally occuring coumarin.
Cinnamon bark oil is considered to be of the strongest natural antibacterial agents and it also has strong anti-clotting properties. It is also used as a stimulant and astringent.