Castoreum is a substance that is derived from the castor sacs of North American beavers. It is commonly used in the manufacturing of perfumes, as well as in the food industry as a flavor enhancer. However, due to its origins, many people are uncomfortable with the use of castoreum in products that they consume. For those who are seeking alternatives, there are several synonyms for castoreum that are often used in ingredient lists. These include "natural flavoring," "beaver extract," "beaver juice," and "castor gland secretion." While these terms may seem more innocuous than castoreum, it is important for consumers to be informed about the source of the ingredients in the products they consume.