At least some content in this article is derived from information featured in Harry Potter: Wizards Unite. As such, spoilers will be present within the article.
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Bitter root (alternatively spelled bitterroot) is a plant that can be used as a potion ingredient. It is used in the Exstimulo Potion, Strong Exstimulo Potion and Potent Exstimulo Potion, and is presumably one the ingredients used to brew the Burning Bitterroot Balm, a healing potion.