My review of Swanson Full Spectrum True Cinnamon (600mg, 90 Capsules)
Dr Oz’s Recommendation on Vitamins
Most of the cinnamon you find at the grocery store isn't "true" cinnamon. True cinnamon comes from a different, though related, plant species known as Cinnamomum verum (aka Cinnamomum zeylanicum ), which is native to Sri Lanka (formerly Ceylon). Thus, this distinctive herb is often called Ceylon cinnamon. Other species of cinnamon-the most common being Cinnamomum cassia- share much in common but differ in important ways. True Cinnamon has less volatile oil than cassia cinnamon and contains different levels of key compounds.