[Robert357]

Be careful with the type of cinnamon, as there is a substance that is found in ground cinnamon that can damage the liver. Some brands of the spice may be contaminated with coumarin.

[Freedom4US]

How do I know if I have the “good” cinnamon?

Cassia is also called cinnamon, confusing things further. I think that’s the “red hot” candy kind, that isn’t really cinnamon, either. Then there’s the powdery stuff that is good on sugared toast... Is that the difference?