Holy crap, rootbeer is about as toxic as eating 2 apples!
Root Beer Concentrate
And they banned it for that!

this seems really stupid. Also
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I have made a `root beer ale' by using a can of malt extract (light) along with the root beer extract, and then fully fermenting it out. It tasted like a dry root beer (not at all sweet, of course), but had a kick to it.
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This seems to defeat the purpose of rootbeer but have fun.