Recent Examples of coumarin from the Web
Cassia can contain relatively high concentrations of coumarin, a plant compound that can damage the liver.
Cassia sticks, which look like a thick layer of rolled bark, also contained 18 times more coumarin than Ceylon sticks, which have thin layers.
Both cassia cinnamon and Saigon cinnamon contain coumarin, a natural compound that can harm the liver when taken in large amounts.
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medical Definition of coumarin
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