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Bistort (Persicaria bistorta) is a perennial in the knotweed family with pink flower spikes and a thick, characteristically twisted rhizome.
Identification
The plant produces elongated basal leaves and dense cylindrical spikes of pale pink flowers. Its common name refers to the bent or twice-twisted appearance of the underground rhizome.
Traditional Use
The tannin-rich rhizome was traditionally used as an astringent in European herbal practice, especially in preparations associated with loose stools, mouth and throat rinses, and minor external irritation.
Food History
Young leaves were historically included in certain regional spring dishes, including northern English traditions. Culinary use is much less common today.
Research Context
Bistort contains tannins and polyphenolic compounds with laboratory antioxidant and antimicrobial activity. Human clinical research is limited.
Safety
High-tannin preparations can irritate the stomach and may reduce absorption of some medicines or minerals when taken at the same time. Prolonged heavy internal use is not well studied.
Folklore
The twisted root contributed to old doctrine-of-signatures interpretations and to the plant’s long reputation as a strongly binding or astringent herb.
Educational information only.