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"In beverages and candy, sassafras was used in the past to flavor root beer. It was also used as a tea. But sassafras tea contains a lot of safrole, the chemical in sassafras that makes it poisonous. One cup of tea made with 2.5 grams of sassafras contains about 200 mg of safrole. That equates to a dose of about 3 mg of safrole per 1 kg of body weight. This is about 4.5 times the dose that researchers think is poisonous. So, in 1976, the US Food and Drug Administration (FDA) ruled that sassafras could no longer be sold as sassafras tea."