When did the US ban sassafras?

It has been used as a flavoring agent for more than 60 years. Oil of sassafras, which contain 80% safrole, has also been used as a spice. In the United States, the FDA banned the use of safrole in 1958 (or 1960, depending on the source) and many other countries followed this lead and also banned the use of safrole in flavors.

https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/safrole

Safrole is found in oils of camphor and saffras. It has been used medicinally as a counterirritant and for parasitic infections.

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