Most of the cinnamon that reaches customers is not Ceylon cinnamon, or “true” cinnamon; instead, we are far more likely to receive Cassia, which Healthline explains has a diff ...

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Cassia cinnamon is the type most commonly sold in the U.S. It comes from Asia and is cheaper and has a stronger cinnamon flavor than Ceylon cinnamon, which originates from Sri Lanka.

Cassia cinnamon contains up to 1% coumarin, while levels in Ceylon cinnamon are significantly less, around 0.004%. Talk with your doctor if you have cinnamon intake concerns, ...

A new study reveals cinnamon may reduce medication effectiveness when consumed in large quantities. Research highlights potential risks and differences between ceylon and cassia cinnamon varieties.

Cassia cinnamon contains much higher levels of a compound called coumarin, which can be toxic to the liver in high doses and is known to cause digestive distress in sensitive individuals.

Some types of cassia cinnamon are high in coumarin, but Ceylon cinnamon has much less. If you are concerned about coumarin, Ceylon cinnamon is a safer option for your spice rack.

Ground Cassia cinnamon bark is what is normally found in grocery stores. "In contrast, true cinnamon from Sri Lanka carries a lower risk due to its reduced coumarin content," he said.