Bistort

Other Names

adderwortBistorta majorBistorta officinaliscolumbrinacommon bistortdracunculusdragonwortEaster giantEaster ledgerEaster magiantEaster man-giantEaster mangiantEaster-ledgesEnglish serpentaryEuropean bistortgentle dockgreat bistortmeadow bistortoderwortosterickoysterloitpassion dockpatience dockpatient dockPersicaria bistortapink pokersPolygonon bistortumPolygonum bistortapoor man's cabbagepudding dockpudding grassred legsSchlangen-Knöterichserpentariasnake-rootsnakerootsnakeweedsweet docktwice-writhenwater ledgesWiesenknöterich

Synopsis

Bistort (Bistorta officinalis / Persicaria bistorta)

1. Identity: Botanical Names, Taxonomy, and Natural Source

Bistorta officinalis (synonym Persicaria bistorta), known as bistort, common bistort, European bistort, or meadow bistort, is a species of flowering plant in the dock family Polygonaceae, native to Europe and northern and western Asia. Other common names include snakeroot, snake-root, snakeweed, and Easter-ledges. The species has accumulated an unusually rich roster of regional vernacular names: dragonwort, Easter giant, Easter ledges, Easter man-giant, gentle dock, great bistort, osterick, oysterloit, passion dock, patience dock, patient dock, red legs, twice-writhen adderwort, and snakeweed are among the forms recorded. In Chinese traditional medicine the dried rhizome is known as Bistortae Rhizoma or Quanshen.

The generic placement of this species has historically been in flux, having been placed in Polygonum or Persicaria, but it is now accepted as Bistorta. The Latin name bistorta, from bis ("twice") + torta ("twisted"), refers to the twisted appearance of the root. Accordingly, older literature and many pharmacopoeial references use the synonyms Polygonum bistorta L. and Bistorta officinalis Delalbre interchangeably with the currently accepted Persicaria bistorta (L.) Samp.

Commonly known as common bistort, meadow bistort, snakeweed or gentle dock, it is a hairless perennial herbaceous plant with a simple erect stem, narrow triangular leaves, and bright pink flowers formed in a dense cylindrical terminal spike. P. bistorta is a member of the Polygonaceae family, native to Europe, northern and western Asia, but can also be found in other parts of the globe, such as North America. It is an herbaceous perennial growing to 20 to 80 centimetres (8 to 31 in) tall by 90 cm (35 in) wide. It has a thick, twisted rootstock, which has probably given it its common name of snakeroot. It flowers from June to August and can be found in moist meadows, moors, and mountain brakes. It is typically found growing in moist meadows, nutrient-rich wooded swamps, forest edges, wetlands, parks, gardens, and disturbed ground.

The genus Bistorta belongs to the family Polygonaceae and comprises about 43 species distributed across the globe. The present article focuses primarily on Bistorta officinalis (common bistort) as the species most extensively used medicinally in European and Asian traditions, though reference is made to the broader genus where literature addresses it collectively.

1.1 Common Forms and Preparations

The root, underground stem (rhizome), and leaves are used to make medicine. All parts of the plant are used as a medicinal herb. The dried rootstock, used in the form of extracts, a decoction, or a powder, has been used to stop both internal and external bleeding. Preparations encountered in traditional and contemporary practice include:

Aqueous infusion (herbal tea): dried, powdered rhizome steeped in hot water; the most common traditional internal and external-compress preparation.
Decoction: roots boiled in water, historically also prepared as a medicinal wine.
Powder: powder obtained by pulverizing the dried-out herb may be applied directly to any wound to stop bleeding.
Tincture / hydroalcoholic extract: used in contemporary herbal practice for oral or topical administration.
Poultice: poultices made from crushed bistort roots were applied to wounds, cuts, and insect bites to promote healing and prevent infection.
Gargle and mouthwash: the root was commonly prepared as a decoction or infusion and consumed or used as a gargle to soothe sore throats and treat mouth ulcers.
Culinary use: bistort has been cultivated as a vegetable, its roots, leaves, and young shoots being steamed or boiled. The root can be eaten raw or cooked; it is rich in starch and tannin and is steeped in water and then roasted to reduce the tannin content.

2. Traditional and Historical Use

2.1 Europe

Bistort has a rich history of medicinal use dating back centuries in Europe and Asia. Traditionally, bistort root has been highly valued for its powerful astringent properties, attributed to its high tannin content. Folk healers and herbalists often relied on it to address gastrointestinal issues, such as diarrhea and dysentery, by helping to reduce inflammation and tighten tissues.

In Poland, bistort rhizome was used in folk medicine for the treatment of snakebites (both oral and topical use), skin injuries and infections, and the control of heavy menorrhagia or risk of miscarriage. The raw plant material was traditionally used in Serbia and Montenegro to prepare herbal teas applied externally as compresses for skin complaints, festering wounds, and haemorrhoids.

During the Middle Ages, bistort was a favored remedy for excessive bleeding, particularly during childbirth or heavy menstruation. An allusion to its healing powers appears in the early 16th-century French tapestry The Unicorn in Captivity (now held at The Metropolitan Museum of Art in New York), where bistort sits against the right foreleg of the wounded mythical beast—reflecting its reputation as a wound herb in the early modern period. In a less-lethal context, bistort has a long association with assisting pregnancy: "to help to conceyvve, make electuary of powdre of bistorte in quantyte of halfe a pounde … and swete smellyngs spices of the same weyght," wrote Peter Treveris in his Grete Herball of 1526.

2.2 Northern England: Easter Ledge Pudding

Easter-Ledge Pudding, or Dock Pudding, is a traditional Cumberland, Lake District, and Yorkshire dish served at Easter and during Lent (it is sometimes also known as Passion Pudding, Herb Pudding, or Bistort Pudding); bistort leaves are commonly cooked with onion, oats, barley, butter, and eggs. Gathered in early spring when tender, the leaves formed the main ingredient in Easter Ledge Pudding (also called Dock Pudding); this savoury pudding mixed the slightly bitter, spinach-like leaves with nettles, barley, oats, onion, and sometimes other herbs, bound with egg. It was traditionally eaten around Easter, as a cleansing dish after the Lenten fast.

Up until the 17th century, oatmeal pottage was a staple food in Britain, often enriched with various green herbs for flavour and nutritional value. In northwest England, people made a similar dish called Easter-ledge or ledge pudding using bistort leaves, and they believed these leaves had magical and medicinal properties, such as preventing miscarriages and purifying the blood. While dock pudding is most famously associated with Calderdale, thanks in part to the annual World Dock Pudding Championship held in Mytholmroyd since 1971, the use of bistort in similar pottages and puddings was widespread throughout England and southern Scotland for centuries. The leaves are collected when young, alongside tender nettle tops; there is a recipe for it in Alexis Soyer's classic 19th-century work A Shilling Cookery For the People, where it is made with a mix of two-thirds passion dock and one-third nettles.

2.3 China and East Asia

The root of Polygonum bistorta is a traditional Chinese medicinal plant material widely used in China. It has been commonly used for the treatment of hemostasis, detumescence, diarrhea, snake bite, and acute gastroenteritis. In ancient China, it was used to treat dysentery, diarrhea, and hematochezia, which were similar to the symptoms of ulcerative colitis. Polygonum bistorta is used in traditional Chinese medicine owing to its anticancer activities, though the underlying molecular mechanisms are still being elucidated.

2.4 South and Central Asia

Bistorta species have been utilized for centuries in traditional medicine for the treatment of rheumatism, tuberculosis, inflammation, respiratory infection, and other diseases. Traditional medicine uses the roots and rhizomes of Polygonum bistorta L. to treat cough, bronchitis, and other respiratory infections.

3. Key Constituents and Active Compounds

3.1 Tannins

The main active ingredients in bistort are tannins (oligomeric proanthocyanidins, galloyl, and catechol tannins), which are present in very large quantities in the rootstock (15 to 36 percent). The rhizome contains tannins, mostly condensed flavan-3-ol derivatives. A PubMed-indexed phytochemical study isolated a novel compound from the rhizome: a new tannin-related compound named bistortaside A has been isolated from the rhizome of Polygonum bistorta L.; a new compound was elucidated as 3-methyl-gallic acid 4-O-beta-d-(6′-O-3″-methyl-galloyl)-glucopyranoside, and a known compound was quercetin-3′-O-beta-d-glucopyranoside. The main phenolic compound detected in tested extracts was galloyl glucose (also known as β-glucogallin).

3.2 Flavonoids and Phenolic Acids

UHPLC analysis of the aerial parts allowed the detection of thirty-five major and minor compounds. Major constituents were isolated and identified, including two new natural products: quercetin and kaempferol 3-O-(5″-O-malonyl)-α-l-arabinofuranosides. Anticancer phenolic compounds such as gallic acid, protocatechuic acid, p-hydroxybenzoic acid, chlorogenic acid, vanillic acid, syringic acid, catechol, 4-methyl catechol, syringol and pyrogallol, as well as fatty acids such as linoleic acid, myristic acid, and palmitic acid, were identified in the methanol-water extract.

3.3 Starch, Calcium, and Other Constituents

In addition to tannins, the rootstock contains flavonoids, flobafen (a reddish-brown pigment), starch (approximately 30 percent), calcium (1 percent), sugar, and proteins. Laxative anthraquinones, which are often found in many plants of the Polygonaceae family, are present in small quantities in bistort. The root also contains approximately 1% calcium oxalate.

3.4 Terpenoids and Other Classes

Phytochemical analysis of Bistorta has unraveled chemical constituents that belong to flavonoids, terpenoids, coumarins, alkaloids, and fatty acids. Chemical studies have demonstrated organic acids, flavonoids, and triterpenoids to be among its main constituents. Some triterpenoids, phenolic acids, flavan-3-ols, flavonols, tannins, and fatty acids are among the elucidated physiologically active compounds in the extracts, and these are responsible for antibacterial, antioxidant, hemostatic, immunostimulatory, anti-inflammatory, hepatoprotective, gastroprotective, and anticancer effects. A GC-MS study of bistort root identified 24 metabolites.

4. Mechanisms of Action

4.1 Astringency and Mucosal Protection

Tannins bind to proteins on mucous membranes and wounds, creating a protective layer that reduces irritation, inflammation, and fluid loss. The astringent effect of tannins "shrinks" tissues, helping to control diarrhea by reducing excess secretions and tightening the gut lining; this same action aids in stopping minor bleeding (hemostatic effect) and closing wounds. Bistort contains chemicals called tannins that help improve diarrhea and mouth and throat irritation by reducing swelling (inflammation).

4.2 Anti-inflammatory Pathways

It has been shown that bistort infusion and its constituents influence the release of pro-inflammatory cytokines such as IL-1β, TNF-α, and IL-8, and also affect the viability and apoptosis of healthy cells. Bioactivity assays showed that isolated malonylated flavonoids from the aerial parts inhibit the production of reactive oxygen species (IC50 in the range 22.4–40.6 μM) and myeloperoxidase release (IC50 in the range 22.2–32.2 μM) from stimulated human neutrophils. Studies in a rat model indicate that P. bistorta roots mitigate inflammation and oxidative stress by improving redox signaling and the NF-κB (p65) pathway.

A 2022 network pharmacology study on bistort and ulcerative colitis identified 102 enriched pathways, such as the IL-17 signaling pathway, the TNF signaling pathway, and the NF-κB signaling pathway (P < 0.01).

4.3 Antispasmodic (Gut Motility) Mechanisms

Bistort possesses antispasmodic activities mediated predominantly through K⁺-channel activation, along with a weak Ca²⁺ antagonist effect. In isolated rabbit jejunum, the extract caused a dose-dependent relaxation of spontaneous and low-K⁺ (25 mM)-induced contractions, with a weak effect against high K⁺ (80 mM). In tissues pretreated with glibenclamide or tetraethylammonium chloride (TEA), the relaxant effect was markedly inhibited by TEA only.

4.4 Anticancer Cell Mechanisms

Using hepatoma cells as a model system, one study demonstrated that P. bistorta aqueous extract stimulated endoplasmic reticulum (ER) stress by increasing autophagosomes but blocking degradation, followed by the accumulation of ubiquitinated proteins and cell apoptosis. An autophagy inhibitor did not enhance ubiquitinated protein accumulation, whereas a reactive oxygen species (ROS) scavenger diminished both ubiquitinated protein accumulation and ligand-stimulated epidermal growth factor receptor (EGFR) expression, suggesting that ROS generation by the extract may be upstream of its cell-death mechanism.

5. Scientific Evidence by Area of Use

5.1 Gastrointestinal Disorders (Diarrhea, Dysentery, Colitis)

Traditional context: The subterranean parts of bistort are plant material rich in tannins, popularly used in Europe and Asia as an antidiarrheal and topical anti-inflammatory agent.

Animal and in vitro evidence: Polygonum bistorta is a popular medicinal herb used to treat diarrhea; a pharmacological study provides a basis for its folk use in diarrhea using in vivo and in vitro assays. Administration of P. bistorta rhizome extract to mice offered protection against castor oil-induced diarrhea at 300–1,000 mg/kg and was found safe up to a dose of 5 g/kg.

A 2023 study published in BMC Complementary Medicine and Therapies explored a phytobiotic approach: it was conducted to determine the antibacterial and health-promoting potential of phenolic-rich extract (PRE)-loaded microcapsules obtained from Polygonum bistorta root as a dietary phytobiotic in mice challenged by enteropathogenic Escherichia coli.

A 2022 network pharmacology and in vitro study investigated bistort for ulcerative colitis: ulcerative colitis (UC) is a refractory gastrointestinal disease, and the study aimed to expound the mechanism of Polygonum bistorta (PB) in treating UC by network pharmacology, molecular docking, and experiment verification. In vitro experiments explored the mechanism of quercetin, identified as the main active composition of PB, in treating UC.

Evidence strength: Evidence for antidiarrheal activity is based on plausible mechanism (tannin-mediated astringency and K⁺ channel-mediated antispasmodism), confirmed in animal models, and supported by in vitro network pharmacology. No published randomized controlled trials (RCTs) in human patients have been identified. Evidence remains preclinical and mechanistic.

5.2 Skin Conditions, Wound Healing, and Topical Anti-inflammatory Use

In vitro and mechanistic evidence: A 2020 study published in Journal of Ethnopharmacology (Pawłowska et al.) comprehensively investigated the chemical composition of bistort rhizome infusion and evaluated its biological activity. It was shown that the infusion and its constituents influenced the release of pro-inflammatory cytokines such as IL-1β, TNF-α, and IL-8, and also affected the viability and apoptosis of healthy cells. Both extract and isolated natural products displayed antimicrobial activity against skin pathogens. The results support that infusions from common bistort influence key biological processes crucial for skin conditions with an inflammatory background, and the study justifies the traditional topical application of common bistort.

Evidence strength: This represents in vitro and ex vivo evidence only. While the 2020 study provides a scientific rationale for the traditional topical use of bistort, the in-depth phytochemical investigation of infusions from this plant material was still lacking at the time of publication, and scientific reports supporting the traditional topical application of bistort rhizome are scarce. No clinical trials on topical bistort for skin conditions have been identified in the peer-reviewed literature.

5.3 Respiratory Inflammation and Lung Injury

Animal study (2024/2025, Frontiers in Pharmacology, PMC): A study investigated the lung protective effects of the roots of P. bistorta L. against lipopolysaccharide (LPS)-induced acute lung injury in rats. The outcomes revealed substantial total phenolic and flavonoid contents of 156.2 ± 5.13 GAE/g and 179.45 ± 2.08 mg QE/g, respectively. Plant extract markedly restored LPS-induced hypoxemia, pulmonary edema, histopathological alterations, and leukocyte infiltration in the lung. ELISA testing on bronchoalveolar lavage fluid (BALF) found that the extract efficiently reinstated superoxide dismutase, total antioxidant capacity, malondialdehyde, and total oxidative stress parameters. qRT-PCR indicated a decline in endotoxin-induced overproduction of pro-inflammatory markers, oxidative stress, transcription factor activity, and downregulated antioxidant potential in extract-treated groups.

An acute oral toxicity study in this model revealed an LD₅₀ beyond 7 g/kg.

Evidence strength: This is animal (rat) data only, using an LPS-induced acute lung injury model. No human trials exist. The evidence is preliminary and cannot be extrapolated to clinical respiratory disease without further study.

5.4 Anticancer and Cytotoxic Activity

In vitro evidence: The chloroform and hexane fractions and sub-fractions of Polygonum bistorta were evaluated for cytotoxic activity against P338 (murine lymphocytic leukaemia), HepG2 (hepatocellular carcinoma), J82 (bladder transitional carcinoma), HL60 (human leukaemia), MCF7 (human breast cancer), and LL2 (Lewis lung carcinoma) cancer cell lines in culture. Both the chloroform and hexane fractions and a few of their sub-fractions showed moderate to very good activity against P388, HL60, and LL2 cancer cell lines.

A subsequent study was specifically designed to identify anticancer constituents in a methanol-water extract of Polygonum bistorta L. and evaluate its cytotoxicity. The extract was subjected to preparative HPLC and 13 fractions were obtained; constituents were identified with GC-MS and LC-DAD-ESI-MS. Anticancer phenolic compounds including gallic acid, protocatechuic acid, chlorogenic acid, vanillic acid, and pyrogallol, as well as fatty acids including linoleic acid, myristic acid, and palmitic acid, were separated. Fractions were evaluated for cytotoxic activity on a human hepatocellular carcinoma cell line (HCCLM3), and 11 fractions showed good to strong cytotoxicity in a range of 200 µg/mL to 800 µg/mL.

A PMC-indexed study further examined the mechanism: P. bistorta aqueous extract stimulated ER stress by increasing autophagosomes but blocking degradation, followed by accumulation of ubiquitinated proteins and cell apoptosis; ROS generation by the extract appeared to be upstream of cell death.

Evidence strength: All evidence is in vitro (cell lines) and in silico only. No animal tumor models or human clinical studies are available. These findings are hypothesis-generating only.

5.5 Antioxidant Activity

Pharmacological research studies have confirmed that Polygonum bistorta has antioxidant activity, which is identified as one of its most significant functions. An online microextraction coupled with HPLC-ABTS system was developed for rapid analysis of antioxidants from PB. The PB sample was online extracted by mobile phase; ten components were found, and among them, eight components possessed antioxidant activities.

Aerial parts of P. bistorta are a rich source of polyphenols, and some of them have anti-inflammatory potential.

Evidence strength: Antioxidant activity is well-documented in in vitro and chemical assay systems. Biological relevance in vivo in humans has not been established through clinical trials.

5.6 Hepatoprotective Activity

Polygonum bistorta is a powerful astringent, demulcent, diuretic, febrifuge, and styptic and is rich in tannins. No systematic study had been done on the protective efficacy of P. bistorta and its active principle tannic acid for hepatic diseases. A study set out to evaluate the efficacy of root extract of P. bistorta (100 mg/kg) and tannic acid (25 mg/kg, p.o.) against toxicant-induced damage in liver and kidney. Administration of PB and tannic acid significantly brought the values of studied parameters towards normal and reversed histopathological alterations in liver and kidney, suggesting that P. bistorta and tannic acid can be used to reduce hepatorenal damage.

Evidence strength: This evidence is from a single animal study (albino rats, CCl₄ toxicity model). No human clinical evidence for hepatoprotection exists.

5.7 Oral Health: Canker Sores, Sore Throat, Gingival Bleeding

The root was commonly prepared as a decoction or infusion consumed to soothe sore throats, treat mouth ulcers, and as a gargle for oral health. WebMD's Natural Medicines database lists canker sores, hemorrhoids, upper airway infection, and wound healing as the conditions for which bistort is used, noting that "more evidence is needed to rate the effectiveness of bistort for these uses."

Evidence strength: No controlled clinical trials for oral health indications have been identified. Evidence is traditional and mechanistic (tannin-mediated astringency and antimicrobial activity against oral pathogens).

6. Body Systems and Health Areas Associated with Bistort

Gastrointestinal system: Antidiarrheal, antispasmodic, anticolitis (traditional and preclinical evidence). The subterranean parts of P. bistorta are used in traditional medicine as a topical anti-inflammatory as well as an antidiarrheal agent.
Integumentary system (skin and wounds): Topical use for wounds, festering skin conditions, haemorrhoids, and compresses (traditional and in vitro evidence).
Oral mucosa and throat: Mouthwash, gargle, and compress for sore throat, canker sores, and bleeding gums (traditional use, mechanistic plausibility).
Haemostatic: Hemostatic effect attributed to the phenolic constituents of the extracts.
Respiratory system: Traditional medicine uses the roots and rhizomes to treat cough, bronchitis, and other respiratory infections; preclinical evidence supports anti-inflammatory activity in lung tissue.
Liver and kidney: Hepatoprotective and nephroprotective effects shown in an animal toxicity model.
Antineoplastic: In vitro cytotoxic activity against multiple cancer cell lines (exploratory data only).
Antioxidant / immune support: Broad-spectrum antioxidant activity demonstrated in chemical and cellular assays.

7. Dosage Forms and Dosages Reported in Studies

No standardized dosing has been formally established for bistort in any recognized pharmacopoeia, and the appropriate dose of bistort depends on several factors such as the user's age, health, and other conditions; at this time there is not enough scientific information to determine an appropriate range of doses for bistort. The following dosages are reported exclusively as they appear in cited scientific or reference sources:

Antidiarrheal animal study: Administration of P. bistorta rhizome extract to mice offered protection against castor oil-induced diarrhea at 300–1,000 mg/kg.
Hepatoprotective animal study: Root extract of P. bistorta at 100 mg/kg and tannic acid at 25 mg/kg (oral) were evaluated against toxicant-induced damage in liver and kidney.
Acute lung injury rat study: Acute oral toxicity study revealed an LD₅₀ beyond 7 g/kg.
Cytotoxicity in vitro: 11 fractions from the methanol-water extract showed good to strong cytotoxicity in a range of 200 µg/mL–800 µg/mL against the HCCLM3 hepatocellular carcinoma cell line.

8. Safety Considerations and Drug Interactions

8.1 General Safety Profile

When taken by mouth or applied to the skin: there is not enough reliable information to know if bistort is safe or what the side effects might be. There are no reports of contraindications or side effects when bistort is used properly and in small dosages. Large dosages of the herb may cause irritation of the digestive tract, constipation, nausea, and vomiting.

8.2 High-Tannin Content Concerns

The extremely high tannin load of bistort rhizome (up to 36% in the rootstock by some analyses) carries specific cautions. Bistort contains a large amount of chemicals called tannins. Tannins absorb substances in the stomach and intestines. Excessive tannin ingestion in general has been associated with gastrointestinal discomfort, and the high tannin concentration in bistort means this concern is particularly relevant.

8.3 Oxalic Acid Content

Many species of the Polygonaceae also contain oxalic acid; whilst not considered acutely toxic, this substance can bind up other minerals, making them unavailable to the body and leading to mineral deficiency. Cooking the leaves will reduce their content of oxalic acid. Oxalic acid can make food nutrients, particularly calcium, unavailable to the human digestive system, leading to mineral deficiencies, though oxalic acid levels are decreased when the plant is cooked before consumption. People with a tendency to gout, rheumatism, arthropathies, kidney stones, or hyperacidity should take particular care if introducing this plant into their diet, as it could aggravate their condition.

8.4 Drug Interactions

Taking bistort along with medications taken by mouth can decrease how much medicine the body absorbs and decrease the effectiveness of those medicines. To prevent this interaction, bistort should be taken at least one hour after oral medications. This interaction is attributed specifically to the tannin fraction's known capacity to bind proteins and other macromolecules in the gastrointestinal tract, potentially reducing the bioavailability of co-administered pharmaceuticals.

8.5 Pregnancy and Breastfeeding

There is not enough reliable information to know if bistort is safe to use when pregnant or breastfeeding. Bistort leaves should be avoided during pregnancy or if on anticoagulant therapy.

8.6 Breadth of Evidence Limitations

Bistort is used for diarrhea, wound healing, and other conditions, but there is no good scientific evidence to support these uses. Considering the biological and pharmacological investigations with bistort extracts, their biomedical potential deserves to be tested in malignant, infectious, chronic inflammatory, liver, gastrointestinal, cardiovascular diseases, and diabetes, indicating that the field recognizes the gap between in vitro promise and clinical validation. The overwhelming majority of published evidence to date is in vitro, ex vivo, or in animal models. No Cochrane reviews or large-scale RCTs involving bistort have been identified in the available literature.

References

Health Conditions

Health conditions that Bistort may help support.

No conditions available.

Body Systems

Body systems that Bistort may help support.

No body systems available.