Plant Comparison
Sweet Flag vs Vervain
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
Sweet Flag and Vervain: they share 6 indicated uses (anxiety, bloating, low mood / depression, …); 3 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Sweet Flag | Vervain | Verdict |
|---|---|---|---|
| Anxiety | 7/10 | 2/10 | Stronger for Sweet Flag |
| Bloating | 7/10 | 1/10 | Stronger for Sweet Flag |
| Low mood / depression | 7/10 | 2/10 | Stronger for Sweet Flag |
| Indigestion | 7/10 | 1/10 | Stronger for Sweet Flag |
| Nervous tension | 7/10 | 2/10 | Stronger for Sweet Flag |
| Stress | 7/10 | 1/10 | Stronger for Sweet Flag |
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
Characteristic aromatic constituents - but beta-asarone is the toxic, safety-limiting compound.
Characteristic constituents; verbenalin has a dopaminergic effect.
Antioxidant and anti-inflammatory constituents.
Supporting antioxidant and aromatic constituents.
Pharmacological Actions
Rhizome extracts and the constituent beta-asarone show antiproliferative, pro-apoptotic, anti-invasive and chemosensitizing/chemopreventive activity across gastric, bladder and esophageal cancer models (preclinical).
Traditional nervine for memory and concentration (preclinical neuroprotective, anticonvulsant and antidepressant-like activity)
Traditional nervine for memory and concentration (preclinical neuroprotective, anticonvulsant and antidepressant-like activity)
Traditional nervine for memory and concentration (preclinical neuroprotective, anticonvulsant and antidepressant-like activity)
Aromatic bitter / carminative for indigestion, bloating, flatulence and poor appetite (traditional)
Aromatic bitter / carminative for indigestion, bloating, flatulence and poor appetite (traditional)
Anti-inflammatory and analgesic
Nervine / anxiolytic for nervous tension and mild anxiety; supports sleep (traditional) - a crude extract showed anxiolytic, sedative and anticonvulsant activity in animal models
Nervine / anxiolytic for nervous tension and mild anxiety; supports sleep (traditional) - a crude extract showed anxiolytic, sedative and anticonvulsant activity in animal models
Digestive bitter and relief of mild mental stress
Traditional & Indicated Uses
Aromatic bitter / carminative for indigestion, bloating, flatulence and poor appetite (traditional)
Aromatic bitter / carminative for indigestion, bloating, flatulence and poor appetite (traditional)
Acorus calamus extract inhibits gastric cancer (AGS) growth and angiogenesis; its constituent beta-asarone induces apoptosis and suppresses invasion/EMT in gastric, esophageal and bladder cancer cells and sensitizes them to chemotherapy (preclinical).
Traditional nervine for memory and concentration (preclinical neuroprotective, anticonvulsant and antidepressant-like activity)
inferred from antidepressant action
Aromatic bitter / carminative for indigestion, bloating, flatulence and poor appetite (traditional)
Traditional nervine for memory and concentration (preclinical neuroprotective, anticonvulsant and antidepressant-like activity)
Nervine / anxiolytic for nervous tension and mild anxiety; supports sleep (traditional) - a crude extract showed anxiolytic, sedative and anticonvulsant activity in animal models
inferred from anti-inflammatory action
inferred from antidepressant action
inferred from anti-inflammatory action
inferred from sedative action
Nervine / anxiolytic for nervous tension and mild anxiety; supports sleep (traditional) - a crude extract showed anxiolytic, sedative and anticonvulsant activity in animal models
inferred from anti-inflammatory action
Digestive bitter and relief of mild mental stress
Safety, Cautions & Contraindications
SERIOUS: beta-asarone is hepatotoxic, mutagenic and carcinogenic in animal studies. Regulators have restricted internal use of asarone-containing Acorus calamus (the Asian high-beta-asarone varieties), and it is banned as a food additive in the USA. Avoid internal use except properly characterised beta-asarone-free preparations.
Do not use in pregnancy or breastfeeding, or for prolonged periods. The North American variety (Acorus americanus) is essentially beta-asarone-free, but most commercial calamus is not.
External Ids
Botanical Description
Aromatic, semi-aquatic perennial herb spreading by a thick, branching, aromatic rhizome that creeps horizontally in mud at the water's edge. The leaves are erect, sword-shaped (ensiform), bright green and arranged in a fan like an iris, with a distinctive off-centre midrib and one crinkled, wavy margin. A small, finger-like, greenish-yellow flower spike (spadix) emerges obliquely part-way up a leaf-like flowering stem in summer, but in cool temperate climates the plant rarely sets viable seed and spreads mainly by rhizome division.[14]
Slender, upright perennial herb with wiry, square, sparsely hairy stems and deeply lobed, toothed leaves. Tiny, pale lilac to pale purple, five-lobed flowers are borne sparsely along thin, wiry spikes at the ends of the branches, opening a few at a time.[11]
Habitat
Grows in shallow water and wet mud at the margins of ponds, lakes, slow-moving rivers and marshes. Native to Asia and North America and long naturalised across Europe, where it was historically cultivated and traded for its aromatic rhizome.[14]
Grows on dry waste ground, roadsides, field margins and disturbed soil; native to Europe, North Africa and temperate Asia and widely naturalised elsewhere.[11]
Harvesting
The rhizome is dug from autumn to early spring, when its aromatic oil content is highest, then washed, peeled and dried; the strong sweet-spicy fragrance released on cutting helps confirm correct identification against non-aromatic look-alikes such as yellow flag iris.[14]
The flowering aerial parts are cut in summer as the plant comes into flower and dried in a warm, shaded, airy place.
Traditional Uses
Sweet flag rhizome is a classic aromatic bitter and nervine of Ayurvedic and East Asian traditional medicine, used for indigestion, bloating, flatulence and poor appetite, and as a nervine tonic for memory, concentration and mild nervous complaints.[14]
Vervain has an ancient European reputation, reflected in its old names 'holy herb' and 'herb of the cross', as a calming nervine for nervous tension, anxiety and sleeplessness, and as a bitter digestive tonic; it has also traditionally been used topically and internally for aches, pains and mild inflammation.[11]
Preparations
Dried, peeled rhizome simmered in water as a bitter digestive and nervine decoction.
Not documented
Dosage
Because beta-asarone is hepatotoxic, mutagenic and carcinogenic in animal studies and its content varies widely between varieties, no general dose is given here; internal use should be restricted to properly characterised, beta-asarone-free preparations under professional guidance. Educational reference only, not a prescription.
Not documented
References
Lookalikes Review
Dangerous Lookalikes
Not documented
Drug Class Interactions
Not documented
References & Sources
- Sharma, V., Singh, I. and Chaudhary, P (2014) 'Acorus calamus (The Healing Plant): a review on its medicinal potential, micropropagation and conservation', Natural Product Research, 28(18), pp. 1454-1466. doi:10.1080/14786419.2014.915827 Traditional / reference
https://doi.org/10.1080/14786419.2014.915827 - Khwairakpam, A.D., Damayenti, Y.D., Deka, A., Monisha, J., Roy, N.K. et al (2018) 'Acorus calamus: a bio-reserve of medicinal values', Journal of Basic and Clinical Physiology and Pharmacology, 29(2), pp. 107-122. doi:10.1515/jbcpp-2016-0132 Traditional / reference
https://doi.org/10.1515/jbcpp-2016-0132 - Ukkirapandian, K., Kayalvizhi, E., Udaykumar, K.P., Kandhi, S. and Muthulakshmi, R (2022) 'The Neuroprotective Role of Acorus calamus in Developmental and Histopathological Changes in Autism-Induced Wistar Rats', Cureus, 14(9), pp. e29717. doi:10.7759/cureus.29717 Preclinical
https://doi.org/10.7759/cureus.29717 - Haran, P., Shanmugam, R. and Deenadayalan, P (2024) 'Free radical scavenging, anti-inflammatory and antibacterial activity of Acorus calamus leaves extract against Pseudomonas aeruginosa and Staphylococcus aureus', Cureus, 16(3), pp. e55987. doi:10.7759/cureus.55987 Preclinical
https://doi.org/10.7759/cureus.55987 - Kalra, S., Sachdeva, H., Bhushan Pant, A. and Singh, G (2024) 'Acorus calamus Linn.: a novel neuroprotective approach for traumatic brain injury in Drosophila melanogaster', Brain Research, 1836, pp. 148953. doi:10.1016/j.brainres.2024.148953 Preclinical
https://doi.org/10.1016/j.brainres.2024.148953 - Joshi, R.K (2016) 'Acorus calamus Linn.: phytoconstituents and bactericidal property', World Journal of Microbiology & Biotechnology, 32(10), pp. 164. doi:10.1007/s11274-016-2124-2 Preclinical
https://doi.org/10.1007/s11274-016-2124-2 - Hao, Z., Zhang, Y., Cao, Y., Sun, Y., Wang, Y., Zhang, C., Liang, D., Liu, Y. and Feng, W (2023) 'Chemical constituents from Acorus calamus with potent anti-diabetic and hepatoprotective activities', Fitoterapia, 169, pp. 105591. doi:10.1016/j.fitote.2023.105591 Preclinical
https://doi.org/10.1016/j.fitote.2023.105591 - Olas, B. and Brys, M (2017) 'Is it safe to use Acorus calamus as a source of promising bioactive compounds in prevention and treatment of cardiovascular diseases?', Chemico-Biological Interactions, 281, pp. 32-36. doi:10.1016/j.cbi.2017.12.026 Meta-analysis / review
https://doi.org/10.1016/j.cbi.2017.12.026 - Rajput, S.B., Tonge, M.B. and Karuppayil, S.M (2013) 'An overview on traditional uses and pharmacological profile of Acorus calamus Linn. (Sweet flag) and other Acorus species', Phytomedicine, 21(3), pp. 268-276. doi:10.1016/j.phymed.2013.09.020 Meta-analysis / review
https://doi.org/10.1016/j.phymed.2013.09.020 - Bai, Y., Sun, Y., Xie, J., Li, B., Bai, Y., Zhang, D., Liang, J., Xiao, C., Zhong, A., Cao, Y. and Zheng, X (2019) 'The asarone-derived phenylpropanoids from the rhizome of Acorus calamus var. angustatus Besser', Phytochemistry, 170, pp. 112212. doi:10.1016/j.phytochem.2019.112212 Preclinical
https://doi.org/10.1016/j.phytochem.2019.112212 - Huang, L., Feng, Z., Xiang, J., Deng, M. and Zhou, Z (2024) 'Anti-inflammatory compounds from the rhizome of Acorus calamus and their mechanism', Natural Product Research, 38(20), pp. 3669-3675. doi:10.1080/14786419.2023.2255919 Preclinical
https://doi.org/10.1080/14786419.2023.2255919 - Das, B.K., Swamy, A.V., Koti, B.C. and Gadad, P.C (2019) 'Experimental evidence for use of Acorus calamus (asarone) for cancer chemoprevention', Heliyon, 5(5), pp. e01585. doi:10.1016/j.heliyon.2019.e01585 Meta-analysis / review
https://doi.org/10.1016/j.heliyon.2019.e01585 - Uebel, T., Hermes, L., Haupenthal, S., Muller, L. and Esselen, M (2020) 'alpha-Asarone, beta-asarone, and gamma-asarone: Current status of toxicological evaluation', Journal of Applied Toxicology. doi:10.1002/jat.4112 Traditional / reference
https://doi.org/10.1002/jat.4112 - He, X., Chen, X., Yang, Y., Liu, Y. and Xie, Y (2023) 'Acorus calamus var. angustatus Besser: Insight into current research on ethnopharmacological use, phytochemistry, pharmacology, toxicology, and pharmacokinetics', Phytochemistry. doi:10.1016/j.phytochem.2023.113626 Meta-analysis / review
https://doi.org/10.1016/j.phytochem.2023.113626 - Liu, B. and Dan, W. and Wei, Y. and Zhang, Y. and Wang, C. and Lei, Y. and Hou, T. and Zhang, Y. and Gao, Y (2023) 'beta-asarone inhibits the migration, invasion, and EMT of bladder cancer through activating ER stress', Cancer Medicine, 12(12), pp. 13610-13622. doi:10.1002/cam4.6059 Preclinical
https://doi.org/10.1002/cam4.6059 - Hu, Y. and Li, Z. and Gong, L. and Song, Z (2022) 'beta-Asarone suppresses TGF-beta/Smad signaling to reduce the invasive properties in esophageal squamous cancer cells', Medical Oncology, 39(12), pp. 243. doi:10.1007/s12032-022-01847-0 Preclinical
https://doi.org/10.1007/s12032-022-01847-0 - Tao, H. and Ding, X. and Wu, J. and Liu, S. and Sun, W. and Nie, M. and Pan, X. and Zou, X (2020) 'beta-Asarone Increases Chemosensitivity by Inhibiting Tumor Glycolysis in Gastric Cancer', Evidence-Based Complementary and Alternative Medicine, 2020, pp. 6981520. doi:10.1155/2020/6981520 Preclinical
https://doi.org/10.1155/2020/6981520 - Rahamooz Haghighi, S. and Asadi, M.H. and Akrami, H. and Baghizadeh, A (2017) 'Anti-carcinogenic and anti-angiogenic properties of the extracts of Acorus calamus on gastric cancer cells', Avicenna Journal of Phytomedicine, 7(2), pp. 145-156. Preclinical
https://scholar.google.com/scholar?q=Anti-carcinogenic%20and%20anti-angiogenic%20properties%20of%20the%20extracts%20of%20Acorus%20calamus%20on%20gastric%20cancer%20cells - Wu, J. and Zhang, X.-X. and Sun, Q.-M. and Chen, M. and Liu, S.-L. and Zhang, X. and Zhou, J.-Y. and Zou, X (2015) 'beta-Asarone inhibits gastric cancer cell proliferation', Oncology Reports, 34(6), pp. 3043-3050. doi:10.3892/or.2015.4316 Preclinical
https://doi.org/10.3892/or.2015.4316 - Sharma, V., Sharma, R., Gautam, D.S., Kuca, K., Nepovimova, E. and Martins, N (2020) 'Role of Vacha (Acorus calamus Linn.) in Neurological and Metabolic Disorders: Evidence from Ethnopharmacology, Phytochemistry, Pharmacology and Clinical Study', Journal of Clinical Medicine, 9(4). doi:10.3390/jcm9041176 Traditional / reference
https://doi.org/10.3390/jcm9041176 - North Carolina Extension Gardener Plant Toolbox (2024) 'Acorus calamus (Sweet Flag)'. Available at: https://plants.ces.ncsu.edu/plants/acorus-calamus/ Traditional / reference
https://plants.ces.ncsu.edu/plants/acorus-calamus/ - North Carolina Extension Gardener Plant Toolbox (2024) 'Iris pseudacorus (Yellow Flag)'. Available at: https://plants.ces.ncsu.edu/plants/iris-pseudacorus/ Traditional / reference
https://plants.ces.ncsu.edu/plants/iris-pseudacorus/
- Bekara, A., Amazouz, A. and Douma, T.B (2020) 'Evaluating the Antidepressant Effect of Verbena officinalis L. (Vervain) Aqueous Extract in Adult Rats', Basic and Clinical Neuroscience, 11(1), pp. 91-98. doi:10.32598/bcn.11.1.3 Preclinical
https://doi.org/10.32598/bcn.11.1.3 - Rodrigues Oliveira, S.M., Dias, E., Girol, A.P., Silva, H. and others (2022) 'Exercise Training and Verbena officinalis L. Affect Pre-Clinical and Histological Parameters', Plants, 11(22), pp. 3115. doi:10.3390/plants11223115 Preclinical
https://doi.org/10.3390/plants11223115 - Dong, J., Du, C., Xu, C., Wang, Q. and others (2023) 'Verbenalin attenuates hepatic damage and mitochondrial dysfunction in alcohol-associated steatohepatitis by regulating MDMX/PPARalpha-mediated ferroptosis', Journal of Ethnopharmacology, 307, pp. 116227. doi:10.1016/j.jep.2023.116227 Preclinical
https://doi.org/10.1016/j.jep.2023.116227 - Nisar, R., Adhikary, S., Ahmad, S. and Alam, M.A (2022) 'In Vitro Antimelanoma Properties of Verbena officinalis Fractions', Molecules, 27(19), pp. 6329. doi:10.3390/molecules27196329 Preclinical
https://doi.org/10.3390/molecules27196329 - Dai, X., Zhou, X., Shao, R., Zhao, R. and others (2023) 'Bioactive Constituents of Verbena officinalis Alleviate Inflammation and Enhance Killing Efficiency of Natural Killer Cells', International Journal of Molecular Sciences, 24(8), pp. 7144. doi:10.3390/ijms24087144 Preclinical
https://doi.org/10.3390/ijms24087144 - Zhang, W., Zhang, P., Xu, L.H., Gao, K. and others (2023) 'Ethanol extract of Verbena officinalis alleviates MCAO-induced ischaemic stroke by inhibiting IL17A pathway-regulated neuroinflammation', Phytomedicine, 123, pp. 155237. doi:10.1016/j.phymed.2023.155237 Preclinical
https://doi.org/10.1016/j.phymed.2023.155237 - Kubica, P., Szopa, A. and Ekiert, H (2017) 'Production of verbascoside and phenolic acids in biomass of Verbena officinalis L. (vervain) cultured under different in vitro conditions', Natural Product Research, 31(14), pp. 1663-1668. doi:10.1080/14786419.2017.1286477 Preclinical
https://doi.org/10.1080/14786419.2017.1286477 - Yang, J.Y., Guo, C.S., Su, L., Xu, C.X. and others (2023) 'Four undescribed triterpenes from the aerial parts of Verbena officinalis', Fitoterapia, 170, pp. 105670. doi:10.1016/j.fitote.2023.105670 Preclinical
https://doi.org/10.1016/j.fitote.2023.105670 - Chen, Y., Gan, Y., Yu, J., Ye, X. and others (2023) 'Key ingredients in Verbena officinalis and determination of their anti-atherosclerotic effect using a computer-aided drug design approach', Frontiers in Plant Science, 14, pp. 1154266. doi:10.3389/fpls.2023.1154266 Preclinical
https://doi.org/10.3389/fpls.2023.1154266 - Peng, S., Li, F., Yu, K., Zhou, F. and others (2022) 'Integrating transcriptome and chemical analyses to reveal the anti-Alzheimer's disease components in Verbena officinalis Linn', Frontiers in Plant Science, 13, pp. 955075. doi:10.3389/fpls.2022.955075 Preclinical
https://doi.org/10.3389/fpls.2022.955075 - (2020) 'Verbena officinalis (Common Vervain) - A Review on the Investigations of This Medicinally Important Plant Species', Planta Medica. doi:10.1055/a-1232-5758 Traditional / reference
https://doi.org/10.1055/a-1232-5758 - Khan, A.W., Khan, A.U. and Ahmed, T (2016) 'Anticonvulsant, Anxiolytic, and Sedative Activities of Verbena officinalis', Frontiers in Pharmacology. doi:10.3389/fphar.2016.00499 Preclinical
https://doi.org/10.3389/fphar.2016.00499 - Ghasemzadeh Rahbardar, M. and Hosseinzadeh, H (2024) 'Therapeutic potential of hypnotic herbal medicines: A comprehensive review', Phytotherapy Research, 38(6), pp. 3037-3059. doi:10.1002/ptr.8201 Meta-analysis / review
https://doi.org/10.1002/ptr.8201 - Block, K.I., Gyllenhaal, C. and Mead, M.N (2004) 'Safety and efficacy of herbal sedatives in cancer care', Integrative Cancer Therapies, 3(2), pp. 128-148. doi:10.1177/1534735404265003 Meta-analysis / review
https://doi.org/10.1177/1534735404265003
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.