Plant Comparison
Fennel vs Elecampane
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
Fennel and Elecampane: they share 5 indicated uses (bronchitis, cough, infection (general), …); 2 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Fennel | Elecampane | Verdict |
|---|---|---|---|
| Bronchitis | 1/10 | 1/10 | Comparable evidence |
| Cough | 1/10 | 1/10 | Comparable evidence |
| Infection (general) | 1/10 | 2/10 | Comparable evidence |
| Respiratory support | 1/10 | 1/10 | Comparable evidence |
| Wounds | 1/10 | 2/10 | 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
The aromatic volatile oil of the seed; trans-anethole is the principal component and is associated with the antispasmodic, carminative and estrogen-like activity.
Antioxidant polyphenolic constituents.
Antioxidant and anti-inflammatory constituents.
Major constituents of the fruit/seed oil.
The antimicrobial and anti-inflammatory principles of the root; the eudesmane core and the alpha,beta-methylene-lactone ring are essential for the antimicrobial activity.
A fructan polysaccharide abundant in the root (the genus Inula gives inulin its name).
Pharmacological Actions
Anti-inflammatory - sesquiterpene lactones (alantolactone, isoalantolactone) inhibit NF-kB and MAPK signalling and pro-inflammatory cytokines; total sesquiterpene lactones eased arthritis in animal models (potential in rheumatoid arthritis)
Antimicrobial, notably anti-staphylococcal (membrane-damaging) and anti-mycobacterial (active against Mycobacterium tuberculosis in vitro); supports respiratory and skin infection
Traditional & Indicated Uses
inferred from antimicrobial action
Relieves primary dysmenorrhoea (menstrual) pain - meta-analyses of RCTs find fennel reduces pain intensity versus placebo, comparable to mefenamic acid
inferred from antispasmodic action
Relieves primary dysmenorrhoea (menstrual) pain - meta-analyses of RCTs find fennel reduces pain intensity versus placebo, comparable to mefenamic acid
inferred from expectorant action
Anti-inflammatory - sesquiterpene lactones (alantolactone, isoalantolactone) inhibit NF-kB and MAPK signalling and pro-inflammatory cytokines; total sesquiterpene lactones eased arthritis in animal models (potential in rheumatoid arthritis)
Expectorant for productive cough and bronchitis (long-standing respiratory remedy)
inferred from anticancer action
Expectorant for productive cough and bronchitis (long-standing respiratory remedy); Soothes irritated airways / chronic catarrh (traditional)
Antimicrobial, notably anti-staphylococcal (membrane-damaging) and anti-mycobacterial (active against Mycobacterium tuberculosis in vitro); supports respiratory and skin infection
inferred from anti-inflammatory action
inferred from expectorant action
inferred from anti-inflammatory action
Safety, Cautions & Contraindications
When taken by mouth: Fennel is commonly consumed in foods. It is possibly safe when used as medicine at appropriate doses for a short period of time. There isn't enough reliable information to know whether fennel is safe when used long-term. Although rare, side effects might include stomach upset and seizures.
When applied to the skin: Fennel is possibly safe. Fennel can make skin extra sensitive to the sun and make it easier to get a sunburn. Wear sunblock if you are light-skinned. Special Precautions and Warnings When taken by mouth: Fennel is commonly consumed in foods. It is possibly safe when used as medicine at appropriate doses for a short period of time. There isn't enough reliable information to know whether fennel is safe when used long-term. Although rare, side effects might include stomach upset and seizures.
When applied to the skin: Fennel is possibly safe. Fennel can make skin extra sensitive to the sun and make it easier to get a sunburn. Wear sunblock if you are light-skinned.
Pregnancy: Fennel is possibly unsafe to use when pregnant. Regularly using fennel has been linked to preterm birth.
Breast-feeding: Fennel is possibly unsafe. There are some reports of breast-feeding infants with damage to their nervous systems after they were exposed to herbal tea containing fennel through breastmilk.
Children: Fennel is possibly safe when used at appropriate doses for up to one week in young infants with colic.
Allergy to celery, carrot or mugwort: Fennel might cause an allergic reaction in people who are sensitive to these plants.
Bleeding disorders: Fennel might slow blood clotting. Taking fennel might increase the risk of bleeding or bruising in people with bleeding disorders.
Hormone-sensitive condition such as breast cancer, uterine cancer, ovarian cancer, endometriosis, or uterine fibroids: Fennel might act like estrogen. If you have any condition that might be made worse by estrogen, do not use fennel. (WebMD, n.d.b)
Duke (2002) rates fennel as ++ and notes antispasmodic, carminative, and digestive activities at experimental levels (score 1). Its estrogenic activity is well-documented, and it is traditionally used as a lactagogue. Commission E approves fennel for dyspeptic complaints and upper respiratory tract catarrh. Dose: 1.5–7.5 g seed or equivalent daily. Duke cautions that fennel essential oil in large amounts may be neurotoxic (estrole content), and prolonged use of concentrated extracts should be avoided during pregnancy (Duke, 2002).
The sesquiterpene lactones (especially alantolactone) are known skin sensitisers and can cause allergic contact dermatitis; people sensitive to the daisy family (Asteraceae) should be cautious.
Large doses can cause nausea, vomiting and diarrhoea; safety in pregnancy and breastfeeding is not established, so avoid medicinal doses.
External Ids
Botanical Description
Aromatic, robust perennial (often grown as an annual/biennial) with a smooth, waxy, blue-green, hollow stem and finely divided, thread-fine, feathery leaves. Small yellow flowers are borne in large flat compound umbels in summer, ripening into ridged, strongly aniseed-scented seeds.[3]
Tall, robust perennial herb with large, coarse, hairy leaves - broadly oval near the base and progressively smaller up the stem - arising from a thick, aromatic rhizome. Large, shaggy, bright yellow daisy-like flower heads with numerous narrow ray florets are borne at the top of stout, branching stems.[12]
Habitat
Native to the Mediterranean region; naturalised and widely cultivated worldwide in temperate and subtropical climates as a culinary herb, vegetable (Florence fennel) and spice crop.[3]
Grows in damp meadows, pastures, roadsides and woodland margins on moist, rich soils; native to Europe and Western Asia and naturalised in North America.[12]
Harvesting
Leaves are picked fresh through the growing season; the seed is harvested in autumn once the umbels have browned and dried, then threshed; the swollen root/bulb of Florence fennel is harvested when mature, before flowering.[3]
The root and rhizome are dug in autumn of the second or later year, when sesquiterpene lactone and inulin content is highest, then cleaned, sliced and dried.[12]
Traditional Uses
Fennel seed has an ancient Mediterranean and Asian tradition as a carminative digestive remedy for indigestion, bloating and colic (including infant colic, historically), a mild expectorant for respiratory catarrh, and a traditional lactagogue and emmenagogue owing to its mild estrogen-like activity.[3]
Elecampane root has a long European tradition, reflected in the old name 'elf dock', as a warming expectorant remedy for productive cough, bronchitis and chronic respiratory catarrh, and topically and internally as an antimicrobial for skin and wound infections.[12]
Preparations
Dosage
The EU herbal monograph on bitter fennel fruit gives, for adults and adolescents, 1.5 g of the herbal substance in 250 mL of boiling water (steeped 15 minutes) as an infusion three times daily, for a daily dose of 4.5 g. For children 4 to 12 years, 1.0 g in 100 mL three times daily (daily dose 3.0 g); use is not recommended under 4 years. Use should be short-term, and the monograph limits exposure because of the estragole content of the fruit. Educational reference only, not a prescription.
Not documented
References
Lookalikes Review
Dangerous Lookalikes
Not documented
References & Sources
- Rafieian, F., Amani, R., Rezaei, A. and others (2023) 'Exploring fennel (Foeniculum vulgare): Composition, functional properties, potential health benefits, and safety', Critical Reviews in Food Science and Nutrition, 64(19), pp. 6924-6941. doi:10.1080/10408398.2023.2176817 Meta-analysis / review
https://doi.org/10.1080/10408398.2023.2176817 - Khorshidi, M. and others (2021) 'Fennel (Foeniculum vulgare Miller) for the management of menopausal women's health: A systematic review and meta-analysis', Complementary Therapies in Clinical Practice, 43, pp. 101360. doi:10.1016/j.ctcp.2021.101360 Meta-analysis / review
https://doi.org/10.1016/j.ctcp.2021.101360 - Badgujar, S.B. and Patel, V.V. and Bandivdekar, A.H (2014) 'Foeniculum vulgare Mill: a review of its botany, phytochemistry, pharmacology, contemporary application, and toxicology', BioMed Research International. doi:10.1155/2014/842674 Traditional / reference
https://doi.org/10.1155/2014/842674 - Rasul, A. and others (2019) 'Foeniculum vulgare (Fennel) promotes functional recovery and ameliorates oxidative stress following a lesion to the sciatic nerve in mouse model', Journal of Food Biochemistry, 43(11), pp. e12983. doi:10.1111/jfbc.12983 Preclinical
https://doi.org/10.1111/jfbc.12983 - Rasheed, N. and others (2019) 'The Fennel, Foeniculum vulgare incorporated diet shows anxiolytic potential: A pre-clinical study', Pakistan Journal of Pharmaceutical Sciences, 32(4), pp. 1791-1797. Preclinical
https://scholar.google.com/scholar?q=The%20Fennel%2C%20Foeniculum%20vulgare%20incorporated%20diet%20shows%20anxiolytic%20potential%3A%20A%20pre-clinical%20study - Xu, Y., Yang, Q. and Wang, X (2020) 'Efficacy of herbal medicine (cinnamon/fennel/ginger) for primary dysmenorrhea: a systematic review and meta-analysis of randomized controlled trials', Journal of International Medical Research, 48(6). doi:10.1177/0300060520936179 Meta-analysis / review
https://doi.org/10.1177/0300060520936179 - Bae, J. and others (2022) 'Olfactory Stimulation by Fennel (Foeniculum vulgare Mill.) Essential Oil Improves Lipid Metabolism and Metabolic Disorders in High Fat-Induced Obese Rats', Nutrients, 14(4), pp. 741. doi:10.3390/nu14040741 Preclinical
https://doi.org/10.3390/nu14040741 - Crescente, G. and others (2017) 'Fennel (Foeniculum vulgare Mill. subsp. piperitum) florets, a traditional culinary spice in Italy: evaluation of phenolics and volatiles in local populations, and comparison with the composition of other plant parts', Journal of the Science of Food and Agriculture, 98(5), pp. 1755-1765. doi:10.1002/jsfa.8426 Preclinical
https://doi.org/10.1002/jsfa.8426 - Yakut, H.I., Koyuncu, E., Cakir, U., Tayman, C. and others (2020) 'Preventative and therapeutic effects of fennel (Foeniculum vulgare) seed extracts against necrotizing enterocolitis', Journal of Food Biochemistry, 44(8), pp. e13284. doi:10.1111/jfbc.13284 Preclinical
https://doi.org/10.1111/jfbc.13284 - Kamali, F., Mojani-Qomi, M.S., Arbabi Bidgoli, S., Lavasani, Z. and Adineh, M (2025) 'Fennel (Foeniculum vulgare) oral capsules improve endometrial thickness in infertile women following clomiphene citrate treatment', European Journal of Obstetrics, Gynecology, and Reproductive Biology, 313, pp. 114638. doi:10.1016/j.ejogrb.2025.114638 Randomized trial
https://doi.org/10.1016/j.ejogrb.2025.114638 - Pattanittum, P., Kunyanone, N., Brown, J., Sangkomkamhang, U.S., Barnes, J., Seyfoddin, V. and Marjoribanks, J (2016) 'Dietary supplements for dysmenorrhoea', Cochrane Database of Systematic Reviews, 3, pp. CD002124. doi:10.1002/14651858.CD002124.pub2 Meta-analysis / review
https://doi.org/10.1002/14651858.CD002124.pub2 - Shahrahmani, H., Ghazanfarpour, M., Shahrahmani, N., Abdi, F., Sewell, R.D.E. and Rafieian-Kopaei, M (2021) 'Effect of fennel on primary dysmenorrhea: a systematic review and meta-analysis', Journal of Complementary & Integrative Medicine, 18(2), pp. 261--269. doi:10.1515/jcim-2019-0212 Meta-analysis / review
https://doi.org/10.1515/jcim-2019-0212 - European Medicines Agency (HMPC) (2018) 'European Union herbal monograph on Foeniculum vulgare Miller subsp. vulgare var. vulgare, fructus, Revision 1'. Available at: https://www.ema.europa.eu/en/documents/herbal-monograph/final-european-union-herbal-monograph-foeniculum-vulgare-miller-subsp-vulgare-var-vulgare-fructus-revision-1_en.pdf Traditional / reference
https://www.ema.europa.eu/en/documents/herbal-monograph/final-european-union-herbal-monograph-foeniculum-vulgare-miller-subsp-vulgare-var-vulgare-fructus-revision-1_en.pdf - https://www.webmd.com/vitamins/ai/ingredientmono-311/fennel. Available at: https://www.webmd.com/vitamins/ai/ingredientmono-311/fennel Traditional / reference
https://www.webmd.com/vitamins/ai/ingredientmono-311/fennel - 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 - Dayan, A.D (2024) 'Death of Socrates: a likely case of poison hemlock (Conium maculatum) poisoning', Clinical Toxicology (Philadelphia, Pa.), 62(1), pp. 56-60. doi:10.1080/15563650.2024.2309328 Clinical study
https://doi.org/10.1080/15563650.2024.2309328 - King County Noxious Weeds (2024) 'Poison hemlock (Conium maculatum) identification and control'. Available at: https://kingcounty.gov/en/dept/dnrp/nature-recreation/environment-ecology-conservation/noxious-weeds/identification-control/poison-hemlock Traditional / reference
https://kingcounty.gov/en/dept/dnrp/nature-recreation/environment-ecology-conservation/noxious-weeds/identification-control/poison-hemlock - Grow Forage Cook Ferment 'Poison Hemlock: How to Identify and Potential Look-alikes'. Available at: https://www.growforagecookferment.com/poison-hemlock/ Traditional / reference
https://www.growforagecookferment.com/poison-hemlock/ - Teuscher, E. and Greger, H. and Adrian, V (1990) 'Toxicity of Aethusa cynapium L. (fool's parsley)', Pharmazie, 45(7), pp. 537-8. Available at: https://pubmed.ncbi.nlm.nih.gov/2236201/ Preclinical
https://pubmed.ncbi.nlm.nih.gov/2236201/ - Minnesota Wildflowers (2024) 'Aethusa cynapium (Fool's Parsley)'. Available at: https://www.minnesotawildflowers.info/flower/fools-parsley Traditional / reference
https://www.minnesotawildflowers.info/flower/fools-parsley - Botanical Society of Britain and Ireland (Fermanagh Flora) 'Aethusa cynapium L., Fool's Parsley'. Available at: https://fermanagh.bsbi.org/aethusa-cynapium-l Traditional / reference
https://fermanagh.bsbi.org/aethusa-cynapium-l
- Gierlikowska, B., Gierlikowski, W., Bekier, K., Skalicka-Wozniak, K., Czerwinska, M.E. and Kiss, A.K (2019) 'Inula helenium and Grindelia squarrosa as a source of compounds with anti-inflammatory activity in human neutrophils and cultured human respiratory epithelium', Journal of Ethnopharmacology, 249, pp. 112311. doi:10.1016/j.jep.2019.112311 Preclinical
https://doi.org/10.1016/j.jep.2019.112311 - Gao, S. and Wang, Q. and Tian, X.H. and Li, H.L. and Shen, Y.H. and Xu, X.K. and Wu, G.Z. and Hu, Z.L. and Zhang, W.D (2016) 'Total sesquiterpene lactones prepared from Inula helenium L. has potentials in prevention and therapy of rheumatoid arthritis', Journal of Ethnopharmacology, pp. 39--46. doi:10.1016/j.jep.2016.12.020 Preclinical
https://doi.org/10.1016/j.jep.2016.12.020 - Wang, Q., Gao, S., Wu, G., Yang, N., Zu, X., Li, W., Xie, N., Zhang, R., Li, C., Hu, Z. and Zhang, W (2018) 'Total sesquiterpene lactones isolated from Inula helenium L. attenuates 2,4-dinitrochlorobenzene-induced atopic dermatitis-like skin lesions in mice', Phytomedicine, 46, pp. 78-84. doi:10.1016/j.phymed.2018.04.036 Preclinical
https://doi.org/10.1016/j.phymed.2018.04.036 - Dao, T.T.P., Song, K., Kim, J.Y. and Kim, Y.S (2020) 'Igalan from Inula helenium (L.) suppresses the atopic dermatitis-like response in stimulated HaCaT keratinocytes via JAK/STAT3 signaling', Inflammation Research, 69(3), pp. 309-319. doi:10.1007/s00011-020-01322-4 Preclinical
https://doi.org/10.1007/s00011-020-01322-4 - He, X., Zhao, W., Shao, B., Zhang, B., Liu, T., Sun, C., Huang, H., Wu, J., Liang, J. and Ma, X (2020) 'Natural soluble epoxide hydrolase inhibitors from Inula helenium and their interactions with soluble epoxide hydrolase', International Journal of Biological Macromolecules, 161, pp. 1465-1474. doi:10.1016/j.ijbiomac.2020.04.227 Preclinical
https://doi.org/10.1016/j.ijbiomac.2020.04.227 - Buza, V., Niculae, M., Hanganu, D., Pall, E., Burtescu, R.F., Olah, N., Matei-Latiu, M., Vlasiuc, I., Iozon, I., Szakacs, A.R., Ielciu, I. and Stefanut, L.C (2022) 'Biological Activities and Chemical Profile of Gentiana asclepiadea and Inula helenium Ethanolic Extracts', Molecules, 27(11), pp. 3560. doi:10.3390/molecules27113560 Preclinical
https://doi.org/10.3390/molecules27113560 - Zheng, X., Wu, Z., Xu, J., Zhang, X., Tu, Y., Lei, J., Yuan, R., Cheng, H., Wang, Q. and Yu, J (2021) 'Bioactive sesquiterpenes from Inula helenium', Bioorganic Chemistry, 114, pp. 105066. doi:10.1016/j.bioorg.2021.105066 Preclinical
https://doi.org/10.1016/j.bioorg.2021.105066 - Nder, A.E (2021) 'Efficacy of methanol-water extract of Inula helenium root against oxidative DNA damage', Journal of Traditional Chinese Medicine, 41(2), pp. 293-300. Preclinical
https://scholar.google.com/scholar?q=Efficacy%20of%20methanol-water%20extract%20of%20Inula%20helenium%20root%20against%20oxidative%20DNA%20damage - Chun, J., Song, K. and Kim, Y.S (2018) 'Sesquiterpene lactones-enriched fraction of Inula helenium L. induces apoptosis through inhibition of signal transducers and activators of transcription 3 signaling pathway in MDA-MB-231 breast cancer cells', Phytotherapy Research, 32(12), pp. 2501-2509. doi:10.1002/ptr.6189 Preclinical
https://doi.org/10.1002/ptr.6189 - Li, Y., Ni, Z., Zhu, M., Dong, M., Wang, S., Shi, Q., Zhang, M., Wang, Y., Huo, C., Kiyota, H. and Cong, B (2012) 'Antitumour activities of sesquiterpene lactones from Inula helenium and Inula japonica', Zeitschrift fur Naturforschung C, 67(7-8), pp. 375-380. doi:10.1515/znc-2012-7-804 Preclinical
https://doi.org/10.1515/znc-2012-7-804 - Yan, Y.Y., Zhang, Q., Zhang, B., Yang, B. and Lin, N.M (2019) 'Active ingredients of Inula helenium L. exhibits similar anti-cancer effects as isoalantolactone in pancreatic cancer cells', Natural Product Research, 34(17), pp. 2539-2544. doi:10.1080/14786419.2018.1543676 Preclinical
https://doi.org/10.1080/14786419.2018.1543676 - Kenny, C.R., Stojakowska, A., Furey, A. and Lucey, B (2022) 'From Monographs to Chromatograms: The Antimicrobial Potential of Inula helenium L. (Elecampane) Naturalised in Ireland', Molecules. doi:10.3390/molecules27041406 Traditional / reference
https://doi.org/10.3390/molecules27041406 - Stojanovic-Radic, Z. and Comic, Lj. and Radulovic, N. and Blagojevic, P. and Denic, M. and Miltojevic, A. and Rajkovic, J. and Mihajilov-Krstev, T (2012) 'Antistaphylococcal activity of Inula helenium L. root essential oil: eudesmane sesquiterpene lactones induce cell membrane damage', European Journal of Clinical Microbiology & Infectious Diseases, 31(6), pp. 1015--1025. doi:10.1007/s10096-011-1400-1 Preclinical
https://doi.org/10.1007/s10096-011-1400-1 - Cantrell, C.L. and Abate, L. and Fronczek, F.R. and Franzblau, S.G. and Quijano, L. and Fischer, N.H (1999) 'Antimycobacterial eudesmanolides from Inula helenium and Rudbeckia subtomentosa', Planta Medica, 65(4), pp. 351--355. doi:10.1055/s-1999-14001 Preclinical
https://doi.org/10.1055/s-1999-14001
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.