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Estragol (methyl chavicol) is a volatile oil and is found in fennel and other plants. In some research experiments, estragole has produced tumors in animals.

Fennel oil, which may contain estragole, has been used as a flavoring agent for many foods.

Leung, Albert Y. 1980. Encyclopedia of Common Natural Ingredient used in Food, Drugs and Cosmetics. John Wiley and Sons, N Y. 409 pp.