Burdock root contains approximately 50% inulin,²⁵ a fiber widely distributed in fruits, vegetables and plants. Inulin is classified as a food ingredient (not as an additive) and is considered to be safe to eat.²⁶ In fact, inulin is a significant part of the daily diet of most of the world’s population.²⁷ However, there is a report of a 39-year-old man having a life-threatening allergic reaction after consuming high amounts of inulin from multiple sources.²⁸ Allergy to inulin in this individual was confirmed by laboratory tests. Such sensitivities are exceedingly rare. Moreover, this man did not take burdock. Nevertheless, people with a confirmed sensitivity to inulin should avoid burdock. There is one published case report of a severe allergic reaction, apparently due to burdock itself.²⁹