Saigon cinnamon is possibly unsafe when consumed in large amounts, long-term. The coumarin in Saigon cinnamon might cause liver injury at doses as low as 50 mg daily, which is found in about 7 grams of Saigon cinnamon.

Saigon cinnamon is generally safe to eat in small amounts. One of the most important things to keep in mind, however, is that it is higher in coumarins than other types of cinnamon. Too much coumarin may cause liver damage. If you have a liver condition, you may want to limit your intake or avoid the use of cinnamon.

Couramin can be harmful in large doses, potentially causing high blood pressure, kidney damage, and other health problems. To avoid harmful effects on health, experts recommend limiting the use of Saigon cinnamon or opting for Ceylon cinnamon.

The coumarin molecule found in Vietnamese or Saigon cinnamon is toxic to the liver, kidneys, and lungs.