Plant Comparison
Sea buckthorn 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
Sea buckthorn and Japanese knotweed: they share 5 indicated uses (arthritis / joint pain, cancer (anticancer research), cardiovascular / heart health, …); 3 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Sea buckthorn | Japanese knotweed | Verdict |
|---|---|---|---|
| Arthritis / joint pain | 1/10 | 2/10 | Comparable evidence |
| Cancer (anticancer research) | 2/10 | 2/10 | Comparable evidence |
| Cardiovascular / heart health | 7/10 | 1/10 | Stronger for Sea buckthorn |
| 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
Sea buckthorn berries are among the richest natural sources of vitamin C, along with beta-carotene and other carotenoids.
A distinctive fatty-acid profile, particularly rich in palmitoleic acid (omega-7), the basis of the oil's skin- and mucous-membrane-healing reputation.
Antioxidant flavonoids contributing to the plant's anti-inflammatory 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
Traditional & Indicated Uses
inferred from anti-inflammatory action
inferred from antidiabetic action
inferred from anticancer action
inferred from immunomodulator action
inferred from anti-inflammatory action
inferred from antidiabetic action
inferred from anti-inflammatory action
inferred from anti-inflammatory action
inferred from anticancer action
inferred from anti-inflammatory action
Safety, Cautions & Contraindications
Berries and juice are safe as food. Seed oil is safe topically and orally in moderate amounts. May have mild anticoagulant effects. May lower blood pressure and blood sugar — use caution with medications. Allergic reactions are rare.
Duke (2002) rates sea buckthorn as +++ and notes antioxidant, hepatoprotective, antiulcer, and vulnerary activities at the experimental level (score 1). The berries are exceptionally rich in vitamins C (one of the highest natural sources) and E, carotenoids, flavonoids, and omega-7 fatty acids (palmitoleic acid). Duke recommends sea buckthorn as a 'food farmacy' — consumed as part of the regular diet for its nutritional-medicinal benefits. Its radioprotective properties have been studied, though without strong clinical validation. No significant safety concerns at food doses (Duke, 2002).
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
Thorny, deciduous shrub or small tree with narrow, silvery-grey, willow-like leaves. The plant is dioecious (separate male and female plants); female plants bear dense clusters of small, bright orange-yellow berries tightly packed along the branches, giving a striking display in autumn.[4]
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 on coastal dunes, riverbanks and disturbed, nutrient-poor or sandy soils; native across temperate Europe and Asia, tolerant of harsh, exposed conditions and cold climates, notably widespread in the Himalayan and Tibetan plateau region.[4]
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
Berries are hand-picked (often by cutting whole fruiting branches, given the thorns and fragile fruit) in late summer to autumn once ripe; leaves are picked through the growing season, and seeds are separated from pressed fruit for seed oil.[4]
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
Sea buckthorn has a long Tibetan, Mongolian and traditional Chinese medicine history as a nutritive and healing tonic for respiratory, digestive and skin complaints, and the berries are exceptionally rich in vitamin C and carotenoids; the oil, from both fruit and seed, has a particular traditional and modern reputation for soothing and healing irritated or damaged skin and mucous membranes.[1, 4]
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
Cold-pressed oil from the berry pulp or seed, applied topically for skin healing or taken orally as a nutritional/antioxidant supplement.
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
- Liu, L., Wen, T., Xiao, Y., Chen, H. et al (2024) 'Sea buckthorn extract mitigates chronic obstructive pulmonary disease by suppression of ferroptosis via scavenging ROS and blocking p53/MAPK pathways', Journal of Ethnopharmacology, 336, pp. 118726. doi:10.1016/j.jep.2024.118726 Preclinical
https://doi.org/10.1016/j.jep.2024.118726 - Wen, P., Zhao, P., Qin, G., Tang, S. et al (2018) 'Genotoxicity and teratogenicity of seabuckthorn (Hippophae rhamnoides L.) berry oil', Drug and Chemical Toxicology, 43(4), pp. 391-397. doi:10.1080/01480545.2018.1497047 Preclinical
https://doi.org/10.1080/01480545.2018.1497047 - Gong, G., Guan, Y.Y., Zhang, Z.L., Rahman, K. et al (2020) 'Isorhamnetin: A review of pharmacological effects', Biomedicine & Pharmacotherapy, 128, pp. 110301. doi:10.1016/j.biopha.2020.110301 Traditional / reference
https://doi.org/10.1016/j.biopha.2020.110301 - Suryakumar, G. and Gupta, A (2011) 'Medicinal and therapeutic potential of Sea buckthorn (Hippophae rhamnoides L.)', Journal of Ethnopharmacology, 138(2), pp. 268-278. doi:10.1016/j.jep.2011.09.024 Meta-analysis / review
https://doi.org/10.1016/j.jep.2011.09.024 - Pundir, S., Garg, P., Dviwedi, A., Ali, A., Kapoor, V.K., Kapoor, D., Kulshrestha, S., Lal, U.R. and Negi, P (2021) 'Ethnomedicinal uses, phytochemistry and dermatological effects of Hippophae rhamnoides L.: a review', Journal of Ethnopharmacology, 266, pp. 113434. doi:10.1016/j.jep.2020.113434 Meta-analysis / review
https://doi.org/10.1016/j.jep.2020.113434 - Chen, Y., He, W., Cao, H., Wang, Z., Liu, J., Wang, B. and Wang, C (2024) 'Research progress of sea buckthorn (Hippophae rhamnoides) in prevention and treatment of cardiovascular disease', Frontiers in Cardiovascular Medicine, 11, pp. 1477636. doi:10.3389/fcvm.2024.1477636 Meta-analysis / review
https://doi.org/10.3389/fcvm.2024.1477636 - Ganju, L., Padwad, Y., Singh, R., Karan, D., Chanda, S., Chopra, M.K., Bhatnagar, P., Kashyap, R. and Sawhney, R.C (2005) 'Anti-inflammatory activity of seabuckthorn (Hippophae rhamnoides) leaves', International Immunopharmacology, 5(12), pp. 1675-1684. doi:10.1016/j.intimp.2005.03.017 Preclinical
https://doi.org/10.1016/j.intimp.2005.03.017 - Yasukawa, K., Kitanaka, S., Kawata, K. and Goto, K (2009) 'Anti-tumor promoters phenolics and triterpenoid from Hippophae rhamnoides', Fitoterapia, 80(3), pp. 164-167. doi:10.1016/j.fitote.2009.01.006 Preclinical
https://doi.org/10.1016/j.fitote.2009.01.006 - Zhu, Y., Wu, M., Li, X., Wang, Y., Li, M. and Zhou, H (2023) 'Flash extraction, characterization, and immunoenhancement activity of polysaccharide from Hippophae rhamnoides Linn', Chemistry & Biodiversity, 20(3), pp. e202200776. doi:10.1002/cbdv.202200776 Preclinical
https://doi.org/10.1002/cbdv.202200776 - Zuchowski, J (2023) 'Phytochemistry and pharmacology of sea buckthorn (Elaeagnus rhamnoides; syn. Hippophae rhamnoides): progress from 2010 to 2021', Phytochemistry Reviews, 22(1), pp. 3-33. doi:10.1007/s11101-022-09832-1 Meta-analysis / review
https://doi.org/10.1007/s11101-022-09832-1 - Ciesarova, Z., Murkovic, M., Cejpek, K., Kreps, F., Tobolkova, B., Koplik, R., Belajova, E., Kukurova, K., Dasko, L., Panovska, Z., Revenco, D. and Burcova, Z (2020) 'Why is sea buckthorn (Hippophae rhamnoides L.) so exceptional? A review', Food Research International, 133, pp. 109170. doi:10.1016/j.foodres.2020.109170 Meta-analysis / review
https://doi.org/10.1016/j.foodres.2020.109170 - Ma, X., Yang, W., Kallio, H. and Yang, B (2022) 'Health promoting properties and sensory characteristics of phytochemicals in berries and leaves of sea buckthorn (Hippophae rhamnoides)', Critical Reviews in Food Science and Nutrition, 62(14), pp. 3798-3816. doi:10.1080/10408398.2020.1869921 Meta-analysis / review
https://doi.org/10.1080/10408398.2020.1869921 - Dvorska, D., Sebova, D., Kajo, K., Kapinova, A., Svajdlenka, E., Goga, M., Frenak, R., Treml, J., Mersakova, S., Strnadel, J., Mazurakova, A., Baranova, I., Halasova, E., Brozmanova, M., Biringer, K., Kassayova, M., Dankova, Z., Smejkal, K., Hornak, S., Mojzis, J., Sadlonova, V., Brany, D., Kello, M. and Kubatka, P (2025) 'Chemopreventive and therapeutic effects of Hippophae rhamnoides L. fruit peels evaluated in preclinical models of breast carcinoma', Frontiers in Pharmacology, 16, pp. 1561436. doi:10.3389/fphar.2025.1561436 Preclinical
https://doi.org/10.3389/fphar.2025.1561436 - Ling, N., Tian, H., Wang, Q., Gao, M., Xu, G., Sun, Y., Song, D., Li, W. and Ji, C (2024) 'Advance in Hippophae rhamnoides polysaccharides: extraction, structural characteristics, pharmacological activity, structure-activity relationship and application', International Journal of Biological Macromolecules, 270, pp. 132420. doi:10.1016/j.ijbiomac.2024.132420 Meta-analysis / review
https://doi.org/10.1016/j.ijbiomac.2024.132420 - Chodak, A (2014) 'Sea buckthorn — values and medicinal properties', 21(1), pp. 72--75. Traditional / reference
https://scholar.google.com/scholar?q=Sea%20buckthorn%20%E2%80%94%20values%20and%20medicinal%20properties - Rousi, A (1971) 'The genus Hippophae L.: a taxonomic study', 8(3), pp. 177--227. Traditional / reference
https://scholar.google.com/scholar?q=The%20genus%20Hippophae%20L.%3A%20a%20taxonomic%20study - Zuñiga-López, M.C. et al (2021) 'Sea buckthorn (Hippophae rhamnoides L.) polysaccharides', 26(19). Traditional / reference
https://scholar.google.com/scholar?q=Sea%20buckthorn%20%28Hippophae%20rhamnoides%20L.%29%20polysaccharides - 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
- 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.