Cinnamon is used mainly to flavor various dishes and desserts. It is also available in the form of essential oil, and it is also used in the preparation of a beverage. Studies have shown that a teaspoon of cinnamon a day can lower blood sugar levels in people with type 2 diabetes as it contains the water-soluble polyphenol which mimics the action of insulin. However, it should be consumed in controlled doses as it can affect the effectiveness of the medication.