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Cinnamon derived from the Cinnamomum cassia tree contains coumarin, a chemical which may cause liver and kidney damage and can worsen liver conditions if too much is used.
Make sure to follow package directions when using cassia cinnamon oil, and talk to your doctor before use if you have liver disease.
If you have diabetes, talk to your doctor or pharmacist before using cinnamon essential oil. Aromatherapy may interfere with other medications you’re using to control blood sugar.
Cinnamon oil is very strong, and it’s easy to use too much. Side effects and adverse reactions include skin rashes or burning.
It’s very important to dilute cinnamon oil with a carrier oil, prior to use. Try using one drop of cinnamon essential oil to two or more cups of a carrier oil, such as olive, almond, jojoba, or sesame oil.
Never rub or massage cinnamon oil directly on skin unless it’s diluted with a carrier oil.
Cinnamon oil doesn’t mix with water. Don’t pour undiluted oil directly into bathwater, as it’ll bead and can burn or irritate skin.
You also shouldn’t ingest full-strength cinnamon oil or pour it into capsules meant for oral use. Cinnamon oil can burn mucus membranes and the lining of the esophagus. Avoid rubbing full-strength cinnamon oil on the gums or getting it into your eyes too.
Some people are allergic to cinnamon. Be sure to avoid cinnamon oil or products containing cinnamon oil if you have a cinnamon allergy. *
It's important to note that none of the above studies tested the aromatherapeutic use of cinnamon essential oil. It should also be noted that the ingestion of any essential oil may have harmful and potentially toxic effects.
Cinnamon (particularly Cassia cinnamon) is high in coumarin, a compound that can be toxic to the liver and kidneys if used in excess amounts. (Coumarin can be absorbed through the skin and cause adverse effects even if it isn't ingested.) Coumarin also has a "blood-thinning" effect.
In addition, some individuals may experience irritation and/or allergic reactions when applying cinnamon essential oil to the skin.
It's also important to note that self-treating a health condition with cinnamon essential oil and avoiding or delaying standard care may have serious consequences.
Pregnant women and children should consult their primary health care providers prior to using essential oils. *
