Omnia SanaPlant Comparison
Bistort vs Japanese knotweed
A side-by-side comparison of two medicinal plants — every documented constituent, action, use, safety note and cited source, assembled automatically from the Omnia Sana database.
At a glance
Bistort and Japanese knotweed: both belong to the Polygonaceae family; they share 4 indicated uses (arthritis / joint pain, cancer (anticancer research), inflammation (general), …); 2 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Bistort | Japanese knotweed | Verdict |
|---|---|---|---|
| Arthritis / joint pain | 1/10 | 2/10 | Comparable evidence |
| Cancer (anticancer research) | 2/10 | 2/10 | Comparable evidence |
| Inflammation (general) | 1/10 | 7/10 | Stronger for Japanese knotweed |
| Skin irritation | 1/10 | 1/10 | Comparable evidence |
Evidence scores (1–10) are computed from the tier of each cited source. “Comparable” means the two scores are within one point. Follow a score to its detailed sources.
Key Constituents
Very high tannin content is the basis of the strong astringency.
Contribute to antioxidant and antibacterial activity.
Considered the principal bioactive constituents, responsible for much of the antioxidant, anti-inflammatory and cardioprotective activity attributed to this root.
Emodin has laxative and anti-inflammatory activity at typical concentrations but can cause gastrointestinal upset at high doses.
Pharmacological Actions
Anti-inflammatory gargle / mouthwash for inflammation of the mouth and throat (sore throat)
Bistorta officinalis (Polygonum bistorta) rhizome extract, rich in gallotannins and phenolic acids, shows cytotoxic and pro-apoptotic activity against hepatocellular and other cancer cells (preclinical).
Astringent for mild diarrhoea (tannins tighten the gut lining and reduce excess secretion)
Antibacterial (topical) - GC-MS-characterised extracts showed antibacterial activity
Astringent for mild diarrhoea (tannins tighten the gut lining and reduce excess secretion)
Traditional & Indicated Uses
inferred from anti-inflammatory action
Polygonum bistorta (Bistorta officinalis) methanol-water and aqueous extracts inhibit hepatocellular carcinoma cells via ROS-induced ER stress and apoptosis (delaying xenograft tumour growth), with phenolic constituents driving the cytotoxicity (preclinical).
Astringent for mild diarrhoea (tannins tighten the gut lining and reduce excess secretion)
inferred from styptic action
inferred from antimicrobial action
Anti-inflammatory gargle / mouthwash for inflammation of the mouth and throat (sore throat)
inferred from astringent action
Anti-inflammatory gargle / mouthwash for inflammation of the mouth and throat (sore throat)
inferred from anti-inflammatory action
inferred from anticancer action
inferred from anti-inflammatory action
Safety, Cautions & Contraindications
Very tannin-rich: high or prolonged intake may cause stomach upset or constipation and can reduce the absorption of iron and some medicines taken at the same time.
Traditional use only; diarrhoea persisting beyond a few days, or mouth/throat inflammation that does not settle, needs medical assessment.
Safety in pregnancy and breastfeeding is not established; avoid medicinal doses.
Japanese knotweed root contains resveratrol and emodin; high doses of emodin may cause GI discomfort and have laxative effects. Not recommended during pregnancy (emodin has potential teratogenic effects in animal studies). May interact with anticoagulants and antiplatelet medications. Quality control of commercial preparations is important as invasive weed extracts vary significantly.
Duke (2002) rates Japanese knotweed (listed as Hu-Zhang, Fallopia japonica) as +++ and highlights its rich content of resveratrol and emodin. Experimental evidence (score 1) supports COX-2 inhibitory, antioxidant, anti-inflammatory, hepatoprotective, and lipid-lowering activities — largely attributed to resveratrol. Duke notes its use in traditional Chinese medicine for fractures, burns, abscesses, and gynecological conditions. No significant clinical trials were available at time of publication, but resveratrol's biological activity is well-documented in vitro (Duke, 2002).
External Ids
Botanical Description
Perennial herb rising from a thick, twisted, S- or snake-shaped rhizome (giving the names 'bistort' and 'snakeroot'), blackish outside and pink inside. The basal leaves are broadly oval to lance-shaped on long stalks; stem leaves are smaller and stalkless. A single dense, cylindrical spike of small, pale pink flowers is borne atop each unbranched flowering stem.[14]
Vigorous, invasive rhizomatous perennial (Polygonaceae) with hollow, bamboo-like, jointed stems 1-3 m tall (occasionally taller), speckled reddish-purple. Leaves are broad, heart- to shovel-shaped with a flat base. Abundant sprays of small, creamy-white flowers appear in late summer, followed by small winged fruit.[6]
Habitat
Grows in damp meadows, pastures, streamsides and mountain grassland on moist, often calcareous soils; native to Europe and temperate Asia, favouring cooler upland regions.[14]
Native to East Asia (Japan, China, Korea), now a notorious invasive species across Europe and North America, growing in disturbed ground, riverbanks, roadsides and waste land, spreading aggressively via an extensive rhizome network.[6]
Harvesting
The rhizome is dug in autumn or early spring, when tannin content is highest, cleaned and dried; aerial parts are gathered in summer while flowering.[14]
The rhizome/root, the main medicinal part, is dug in autumn or winter when resveratrol content is highest; young spring shoots (stems) are also edible and used. Strict containment is required when harvesting, given the plant's severe invasiveness.[6]
Traditional Uses
Bistort rhizome, one of the most tannin-rich temperate herbs, has a long European folk history as a powerful astringent for mild diarrhoea, as a gargle for sore throat and mouth inflammation, and topically as a vulnerary and styptic for minor wounds and bleeding; young leaves have also traditionally been eaten as a spring pot-herb ('Easter-ledge pudding').[13, 14]
Known as Hu Zhang in Traditional Chinese Medicine, Japanese knotweed root has a centuries-old use for inflammation, infections, jaundice and menstrual complaints. Modern interest centres on its resveratrol and emodin content, now studied (as Polygonum cuspidatum extract) for antioxidant, anti-inflammatory, cardioprotective and hepatoprotective activity, and more recently for supportive use in acute respiratory infections.[2, 3, 6]
Preparations
References
Lookalikes Review
Dosage
Not documented
Duke (2002) and general phytotherapy guidance treat this as an experimentally supported herb without a single agreed clinical dose; commercial resveratrol-standardised extracts should be dosed per product labelling. Educational reference only, not a prescription; avoid in pregnancy.
References & Sources
- Pawłowska, K.A., Hałasa, R., Dudek, M.K., Majdan, M. et al (2020) 'Antibacterial and anti-inflammatory activity of bistort (Bistorta officinalis) aqueous extract and its major components: justification of the usage of the medicinal plant material as a traditional topical agent', Journal of Ethnopharmacology, 260, pp. 113077. doi:10.1016/j.jep.2020.113077 Preclinical
https://doi.org/10.1016/j.jep.2020.113077 - Jovanović, M., Morić, I., Nikolić, B., Pavić, A. et al (2020) 'Anti-Virulence Potential and In Vivo Toxicity of Persicaria maculosa and Bistorta officinalis Extracts', Molecules, 25(8), pp. 1811. doi:10.3390/molecules25081811 Preclinical
https://doi.org/10.3390/molecules25081811 - Duwiejua, M., Zeitlin, I.J., Waterman, P.G. and Gray, A.I (1994) 'Anti-inflammatory activity of Polygonum bistorta, Guaiacum officinale and Hamamelis virginiana in rats', Journal of Pharmacy and Pharmacology, 46(4), pp. 286-290. doi:10.1111/j.2042-7158.1994.tb03795.x Preclinical
https://doi.org/10.1111/j.2042-7158.1994.tb03795.x - Esmaealzadeh, N., Abdolghaffari, A., Baeeri, M., Hasanpour, M., Iranshahi, M., Santarcangelo, C., Gholami, M. and Bahramsoltani, R (2024) 'Protective effect of freeze-dried extract of Persicaria bistorta Samp. on acetic acid-induced colitis model in rats: involvement of nitric oxide and opioid system', Inflammopharmacology, 32(6), pp. 3845-3861. doi:10.1007/s10787-024-01518-8 Preclinical
https://doi.org/10.1007/s10787-024-01518-8 - Klimczak, U., Wozniak, M., Tomczyk, M. and Granica, S (2017) 'Chemical composition of edible aerial parts of meadow bistort (Persicaria bistorta (L.) Samp.)', Food Chemistry, 230, pp. 281-290. doi:10.1016/j.foodchem.2017.02.128 Preclinical
https://doi.org/10.1016/j.foodchem.2017.02.128 - Manoharan, K.P., Benny, T.K.H. and Yang, D (2005) 'Cycloartane type triterpenoids from the rhizomes of Polygonum bistorta', Phytochemistry, 66(19), pp. 2304-2308. doi:10.1016/j.phytochem.2005.07.008 Preclinical
https://doi.org/10.1016/j.phytochem.2005.07.008 - Liu, X., Hua, H., Liu, J., Chen, F. and Wu, L (2006) 'A new tannin-related compound from the rhizome of Polygonum bistorta L', Journal of Asian Natural Products Research, 8(4), pp. 299-302. doi:10.1080/10286020500034956 Preclinical
https://doi.org/10.1080/10286020500034956 - Yang, W., Qian, Z., Wu, M., Gao, J., Huang, Q., Zou, Y. and Tang, D (2023) 'Online microextraction coupled with HPLC-ABTS for rapid analysis of antioxidants from the root of Polygonum bistorta', Evidence-Based Complementary and Alternative Medicine, 2023, pp. 7496848. doi:10.1155/2023/7496848 Preclinical
https://doi.org/10.1155/2023/7496848 - Bauer, I., Rimbach, G., Nevermann, S., Neuhauser, C., Schwarzinger, B., Schwarzinger, C., Weghuber, J. and Luersen, K (2023) 'In-vitro antidiabetic activity of a Bistorta officinalis Delarbre root extract can not be confirmed in the in-vivo models hen's egg test and Drosophila melanogaster', Journal of Physiology and Pharmacology, 74(1). doi:10.26402/jpp.2023.1.04 Preclinical
https://doi.org/10.26402/jpp.2023.1.04 - Intisar, A., Zhang, L., Luo, H., Kiazolu, J.B., Zhang, R. and Zhang, W (2012) 'Anticancer constituents and cytotoxic activity of methanol-water extract of Polygonum bistorta L', African Journal of Traditional, Complementary and Alternative Medicines, 10(1), pp. 53-59. doi:10.4314/ajtcam.v10i1.9 Preclinical
https://doi.org/10.4314/ajtcam.v10i1.9 - Liu, Y., Weng, Y., Lin, H., Tang, S., Chen, C., Liang, C., Ku, C. and Lin, J (2017) 'Aqueous extract of Polygonum bistorta modulates proteostasis by ROS-induced ER stress in human hepatoma cells', Scientific Reports, 7, pp. 41437. doi:10.1038/srep41437 Preclinical
https://doi.org/10.1038/srep41437 - Khan, S., Arshad, S., Masood, I., Arif, A., Abbas, S., Qureshi, A.W., Parveen, A. and Seemab Ameen, Z (2023) 'GC-MS Analysis of Persicaria bistorta: Uncovering the Molecular Basis of Its Traditional Medicinal Use', Applied Biochemistry and Biotechnology, 196(4), pp. 2270--2288. doi:10.1007/s12010-023-04580-0 Traditional / reference
https://doi.org/10.1007/s12010-023-04580-0 - WebMD (n.d.) 'Bistort: Overview, Uses, Side Effects, Precautions, Interactions, Dosing and Reviews'. Available at: https://www.webmd.com/vitamins/ai/ingredientmono-75/bistort Traditional / reference
https://www.webmd.com/vitamins/ai/ingredientmono-75/bistort - (2020) 'Antibacterial and anti-inflammatory activity of bistort (Bistorta officinalis) aqueous extract and its major components - justification of the usage of the medicinal plant material as a traditional topical agent', Journal of Ethnopharmacology. doi:10.1016/j.jep.2020.113077 Traditional / reference
https://doi.org/10.1016/j.jep.2020.113077
- Dong, X., Fu, J., Yin, X., Cao, S. and others (2016) 'Emodin: A Review of its Pharmacology, Toxicity and Pharmacokinetics', Phytotherapy Research, 30(8), pp. 1207-1218. doi:10.1002/ptr.5631 Traditional / reference
https://doi.org/10.1002/ptr.5631 - Wang, S., Yang, Y., Sun, L., Qiao, G. and others (2022) 'Reynoutria japonica Houtt for Acute Respiratory Tract Infections in Adults and Children: A Systematic Review', Frontiers in Pharmacology, 13, pp. 787032. doi:10.3389/fphar.2022.787032 Meta-analysis / review
https://doi.org/10.3389/fphar.2022.787032 - Ke, Y., Zhan, L., Lu, T., Zhou, C. and others (2023) 'Advances for pharmacological activities of Polygonum cuspidatum (Reynoutria japonica) - A review', Pharmaceutical Biology, 61(1), pp. 177-188. doi:10.1080/13880209.2022.2158349 Traditional / reference
https://doi.org/10.1080/13880209.2022.2158349 - Zhang, Q., Zhao, Y., Zhang, M., Zhang, Y. and others (2021) 'Bioactive amides from Reynoutria japonica', Journal of Asian Natural Products Research, 23(3), pp. 228-234. doi:10.1080/10286020.2021.1873298 Preclinical
https://doi.org/10.1080/10286020.2021.1873298 - Lai, Y., Zhou, C., Huang, P., Dong, Z. and others (2024) 'Polygonum cuspidatum polysaccharide: A review of its extraction and purification, structure analysis, and biological activity', Journal of Ethnopharmacology, 331, pp. 118079. doi:10.1016/j.jep.2024.118079 Traditional / reference
https://doi.org/10.1016/j.jep.2024.118079 - Peng, W., Qin, R., Li, X. and Zhou, H (2013) 'Botany, phytochemistry, pharmacology, and potential application of Polygonum cuspidatum Sieb. et Zucc.: a review', Journal of Ethnopharmacology, 148(3), pp. 729-745. doi:10.1016/j.jep.2013.05.007 Traditional / reference
https://doi.org/10.1016/j.jep.2013.05.007 - Wang, X., Liang, L., Yan, J., Li, Z. and others (2023) 'Citri Reticulatae Pericarpium-Reynoutria japonica Houtt. herb pair suppresses breast cancer liver metastasis by targeting ECM1-mediated cholesterol biosynthesis pathway', Phytomedicine, 116, pp. 154896. doi:10.1016/j.phymed.2023.154896 Preclinical
https://doi.org/10.1016/j.phymed.2023.154896 - Jiang, Y., Liu, Y., Zhang, X. and others (2020) 'New phenolic glycosides from Reynoutria japonica', Journal of Asian Natural Products Research, 22(1), pp. 17-23. doi:10.1080/10286020.2019.1646730 Preclinical
https://doi.org/10.1080/10286020.2019.1646730 - Liu, Y., Wang, J., Li, Q. and others (2024) 'The Possibility of Polygonum cuspidatum against Osteoarthritis based on Network Pharmacology', Current Computer-Aided Drug Design, 20(2), pp. 121-133. doi:10.2174/1573409919666230403114131 Preclinical
https://doi.org/10.2174/1573409919666230403114131 - Espinosa-Andrews, H., Morales-Hernandez, N., Garcia-Marquez, E. and others (2025) 'Physicochemical and rheological characteristics of commercial Greek-style yogurt enriched with Polygonum cuspidatum roots or the P. cuspidatum beta-cyclodextrin inclusion complex', Food Research International, 203, pp. 115854. doi:10.1016/j.foodres.2025.115854 Preclinical
https://doi.org/10.1016/j.foodres.2025.115854 - Burns, J., Yokota, T., Ashihara, H., Lean, M.E.J. and Crozier, A (2002) 'Plant foods and herbal sources of resveratrol', 50(11), pp. 3337--3340. doi:10.1021/jf0112973 Traditional / reference
https://doi.org/10.1021/jf0112973 - Royal Botanic Gardens, Kew (n.d.). Available at: https://powo.science.kew.org Traditional / reference
https://powo.science.kew.org - World Health Organization (2007) 'WHO Monographs on Selected Medicinal Plants'. Traditional / reference
https://scholar.google.com/scholar?q=WHO%20Monographs%20on%20Selected%20Medicinal%20Plants - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition
Generated automatically from the Omnia Sana plant database and its cited sources. For educational purposes only — not medical advice. Always consult a qualified practitioner before using medicinal plants.