The principal ingredient in the legendary liqueur Absinthe, wormwood use dates back to before 1600 BC. While used historically as a beverage ingredient, the FDA advises against the internal use of wormwood due to the substance thujone. Wormwood can be used as a bittering agent for beer; however, a little goes a long way. Caution should be exercised when it is used in conjunction with or as a replacement for hops.It has flavor characteristics resembling mint and licorice.