Locations of Coumarin Sources in the USA

Coumarin is not an allergen in the conventional sense as it doesn't grow, but is a chemical compound found in various plants. In the USA, plants that contain coumarin grow in various regions across the country. Here are some primary sources:

Tonka Beans


 

• This plant, native to Central and South America, can be found in Florida and other southern states.

Sweet Grass


 

• Also known as Hierochloe odorata, this plant which contains coumarin, is widespread across North America, particularly in the northern states and along the Pacific coast.

Woodruff


 

• Woodruff (Galium odoratum), a plant that contains coumarin, is often found growing in the Northeast and Midwest regions of the USA.

These plants with coumarin content can be found in various environments including woodlands, meadows, and even residential areas.

If you’re allergic to coumarin, you need to steer clear of food items that contain this compound. Coumarin is found in certain aromatic substances, like tonka beans and cinnamon, particularly cassia cinnamon which has higher levels compared to Ceylon cinnamon.

Be cautious with the following foods:

• Cassia Cinnamon: This type of cinnamon contains a significant level of coumarin, thus people with coumarin allergy should prefer Ceylon ("true") cinnamon.
• Tonka Beans: Tonka beans have a high concentration of coumarin. In fact, they are likely to have the highest concentration of all food sources. Avoid these beans as well as any food items or extracts containing them.
• Certain Berries: Some types of berries, like bilberries, may contain coumarin. Make sure to double-check the type of berries you consume.
• Alcoholic Beverages: Drink such as beer, fortified wine, or botanical spirits may contain coumarin, depending on their ingredients and the method of preparation.

While a well-balanced diet is essential, it is just as important for someone with a coumarin allergy to avoid certain foods that can exacerbate their allergic reactions.