1oz Package. The principal ingredient in the legendary liqueur Absinthe, wormwood uses dates back to before 1600 BC. Its powerful bitterness was prized by brewers, as were its strong antibacterial properties. Wormwood has a mild minty,licorice aroma, but it has extremely strong herbal bittering properties. The FDA advises against the internal use of wormwood as it cantains thujone, which can be harmful if injested in large amounts.