Important Tips and Warnings
Becky Bell, MS, RD, offers some advice:
Cinnamon: Cinnamon contains a compound called coumarin, which can be toxic in large quantities. Cassia cinnamon contains higher levels of coumarin than Ceylon cinnamon. It’s best to choose Ceylon cinnamon, but if you use Cassia cinnamon, limit your intake to 1/2 teaspoon (0.5 to 2 grams) daily. You can safely consume up to 1 teaspoon (about 5 grams) of Ceylon cinnamon per day.