More and more people are turning to "natural" ingredients and are missing out on important information: their dangerous side effects. The plant that once was used to make root beer was deemed to cause cancer, and the FDA banned it decades ago.
Botanical Dietary Supplements Gone Bad. 2007.
Sassafras from WebMD.
From Dr. Weil.
JAMA article from 1976. "...aromatic oil present in sassafras root bark, was a hepatocarcinogen in rats..."
Code of Federal Regulations, Title 21, part 189.180.
A Google search.