Beyond that, the National Institutes of Health says that

Caution should also be exercised when relating flying reindeer to the effects of the hallucinogenic (actually a deliriant) fly agaric mushroom, or Amanita Muscaria, which was, and presumably still is, consumed during shamanic rituals by the Lapps and some Siberian peoples. The mushroom is the quintessential toadstool, usually bright red with small white spots and has long been depicted in …