side effects of cinnamon
CASSIA CINNAMON Side Effects & Safety. Cassia cinnamon is LIKELY SAFE when taken by mouth in amounts commonly found in foods and when taken by mouth in medicinal doses for up to 4 months. Cassia cinnamon is POSSIBLY SAFE when applied to the skin in the short-term. Cassia cinnamon is POSSIBLY UNSAFE when taken by mouth in large amounts for a long period of time. Taking large amounts of cassia cinnamon might cause side effects in some people. Cassia cinnamon can contain large amounts of a chemical called coumarin. In people who are sensitive, coumarin might cause or worsen liver disease.