Cinnamon is one of the most important flavoring agents in foods and drinks, team leader Ikhlas Khan explained. It is the second most popular spice, next to black pepper, in the United States and Europe.
Ceylon cinnamon, also known as "true cinnamon" (cinnamon verum) is very expensive. Therefore, most foods in the USA and Western Europe, including sticky buns, breads and other products use the cheaper Cassia cinnamon (dried Cassia bark).
have linked coumarin intake to liver damage in a small number of sensitive individuals.
True cinnamon has very little coumarin, unlike Cassia cinnamon. A 2010 German study found that on average, Cassia cinnamon powder had up to 63 times more coumarin compared to Ceylon cinnamon powder, while Cassia cinnamon sticks contained 18 times more than Ceylon cinnamon sticks.
The researchers in this latest study also reported that coumarin, a naturally-occurring substance, may cause liver damage in some sensitive people.
"As found in this study, coumarin was present, sometimes in substantial amounts, in cinnamon-based food supplements and cinnamon-flavored foods."
According to health officials, consumers cannot tell the difference between Ceylon and Cassia cinnamon in powder form. Cinnamon sticks look different though - Cassia cinnamon sticks consist of a thick layer of rolled bark, while Ceylon cinnamon sticks have thin layers.