Cinnamon is a sweet and spicy bark that adds zest to many dishes. It can also help to regulate the body’s glucose levels. Eating cinnamon frequently offers protection from metabolic disorders, including diabetes, and also protects the kidneys from damage due to chronic high blood sugar. Another risk factor for kidney disease is heart disease, and cinnamon is thought to protect against this, too.
However, cinnamon also contains a compound called coumarin, which can cause liver damage in high amounts. You’d need to eat more than a teaspoon of cinnamon a day to reach dangerous levels, which is actually tough to do. Cinnamon is a powerful flavor and you don’t need much.