According to the U.S. Department of Agriculture5, ten grams of ground cinnamon contains:
Energy: 24.7 kcal
Fat: 0.12 g
Carbohydrates: 8.06 g
Protein: 0.4 g.
Risks and precautions
Some people who are sensitive to cinnamon may be at an increased risk of liver damage after consuming cinnamon-flavored foods, drinks and food supplements.
This is likely due to the fact that cinnamon contains coumarin, a naturally occurring flavoring substance, which has been linked to liver damage. Cassia cinnamon powder (commonly used in foods in the USA and Western Europe) contains more coumarin than Ceylan cinnamon powder. A 2010 German study found that on average, Cassia cinnamon powder had up to 63 times more coumarin compared to Ceylon cinnamon powder, while Cassia cinnamon sticks contained 18 times more coumarin than Ceylon cinnamon sticks.