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Sassafras root is still used to flavor traditional root beer, although since sassafras was banned by the U.S. Food and Drug Administration because of the carcinogenicity of its constituent safrole, most commercial recipes do not contain sassafras. Some commercial root beers do use a safrole-free sassafras extract.
To be more specific, the IBU's in beer refers to the one part per million of isohumolone. Isohumolone is the acid found in hops that gives the beer its bite. In the beer industry people don't have sweet tooths, they have hop tooths. This means that people crave that bitter beer with a nice pungent taste to it.