Even the famous physician Paracelsus knew: it is the dose alone that makes a substance a poison or a remedy. Hardly any plant embodies this principle as aptly as wormwood (Artemisia absinthium). In the 19th century, it was still abused as high-proof absinthe (‘the Green Fairy’) by artists such as Vincent van Gogh and was notorious for being ruinous due to the neurotoxin thujone; today, however, this medicinal plant often leads a life in the shadows, quite unjustly. Yet, in lo