Wolfsbane

Wolfsbane is one name for Aconitum napellus, a poisonous plant long used to kill predator animals in both Europe and India. While the plant itself is real, it plays a large part in werewolf legends and mythology.

Real World Properties
Aconitum napellus and all its derivatives are real poisons. Ingesting and, in some cases, touching the leaves and flower can be deadly to humans. For example wolfsbane petals in fruit punch would likely kill anyone within hours of ingesting. As little as a tablespoon of the primary chemical in wolfsbane is enough to cause symptoms. 

See Aconitum for more "real world" information about the effects of wolfsbane.

Poison
The flower and its derivatives are poisonous to werewolves.

Controls Shifts
The flower and its derivatives seem to force werewolves into their wolf form.

Healing Properties
On a few occasions wolfsbane flowers or powder has been used to heal.

Effects on Humans
The flower and its derivatives are poisonous to humans but not as poisonous as in the real world.

Wolfsbane Glow
The presence of wolfsbane creates a purple glow around objects and within wounds caused by wolfbane infused weapons or objects.

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 * Werewolf