White Oak (Quercus alba) bark is a premier botanical astringent containing up to 15-20% monomeric and polymeric tannins. These powerful tannins physically constrict capillary walls, precipitate mucosal proteins to form a protective, drying barrier, and immediately halt minor bleeding and fluid leakage. It is an outstanding remedy for acute diarrhea, bleeding hemorrhoids, and weeping skin conditions.
Educational information only — never stop or change a prescribed medication without talking to your prescriber first.
CRITICAL: Do not apply oak bark bath or compress to large open wounds or severe skin damage. Long-term oral use is not recommended due to risk of gastric irritation or liver strain from excessive tannins. Avoid during pregnancy.
Evidence level: Strong
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