intake of coumarin is 0.05 mg per pound (0.1 mg  per kilogram) of body weight. For Saigon cinnamon,  

this equates to about 1 teaspoon (2.5 grams)  daily. Consuming cinnamon within this limit is  

considered safe, but it's important to be cautious  with intake due to the potential risks associated  

with high coumarin levels. The coumarin levels  differ significantly between, Saigon cinnamon,  

Regular cinnamon and Ceylon cinnamon. A study  published in the National Library of Medicine  

titled ”Cassia cinnamon as a source of coumarin  in cinnamon-flavored food and food supplements  

in the United States” found only trace amounts  of coumarin in Ceylon cinnamon, while Cassia  

bark contains substantial levels. Therefore,  Ceylon cinnamon is considered the safer variety.