Tormentil (Potentilla erecta) root is one of the most potent natural astringents known, containing up to 15-20% condensed tannins (specifically tormentil red). These massive tannin molecules bind rapidly to tissue proteins, forming a highly durable, impermeable barrier that shuts down fluid loss in the colon and stops minor localized bleeding. It is a premier remedy for acute loose stools and mucosal ulcerations.
Educational information only — never stop or change a prescribed medication without talking to your prescriber first.
Due to its extreme astringency, long-term continuous oral use can cause severe constipation and interfere with the absorption of nutrients and iron. Discontinue immediately once diarrhea resolves.
Evidence level: Strong
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