Much of the cinnamon available for sale in stores is not real cinnamon but cassia, a close relative to cinnamon. Although they belong to the same species, cinnamon is sweeter and has a more fragile, crumbly texture than cassia. When buying cinnamon, look for the words "real," "sweet" or "Ceylon" on the package. These words indicate that you're getting real cinnamon and all the benefits that come with it.
Can Cause Dermatitis
Cinnamon can cause contact dermatitis and skin irritation in certain people. Some also experience allergic reactions after touching or ingesting cinnamon. People who are allergic to cinnamon compounds should read ingredient labels and avoid beauty products that contain cinnamon, such as soaps or toothpaste.
Can Damage Your Liver
Both cassia and cinnamon contain coumarin, a fragrant chemical compound that can be toxic in large amounts. Real cinnamon contains about 0.004 percent of coumarin, which is a very small amount. Cassia or "fake cinnamon" contains much more, at about 5 percent. Sensitive people can suffer liver damage from consuming coumarin.
Drug Interaction
A 2007 study published in the "American Journal of Health-System Pharmacy" showed that cinnamon can interact with glucose-lowering and blood-thinning medications. If you're taking any type of prescription medication, talk to your doctor before consuming large quantities of cinnamon or using cinnamon supplements.
Other Health Effects
Although cinnamon is generally considered safe, it can cause a number of side effects if you consume too much or if you're sensitive to it. For example, Drugs.com points out that some people can experience faster heart rate or breathing, increased perspiration and an exacerbation of rosacea after consuming cinnamon. Consuming cinnamon oil might cause nausea and vomiting in certain people.
References
- Bundesinstitut für Risikobewertung: Frequently Asked Questions About Coumarin in Cinnamon and Other Foods
- "American Journal of Health-System Pharmacy"; Cinnamon in Diabetes Mellitus; C.K. Chase and C. E. McQueen; May 2007
- Memorial Sloan-Kettering Cancer Center: Cinnamon
- Drugs.com: Cinnamon
- Ceylon Cinnamon: How Do You Identify Real Cinnamon from Cassia
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