Plant Comparison

Fennel vs Ivy Leaf

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.

First plant

Second plant

Plant AFennelFoeniculum vulgareApiaceaeFull monograph →

Plant BIvy LeafHedera helixAraliaceaeFull monograph →

At a glance

Fennel and Ivy Leaf: they share 5 indicated uses (bronchitis, cough, menstrual cramps, …); 2 pharmacological actions in common.

FennelIvy Leaf

Constituents42

Pharmacological actions33

Indicated uses86

Safety notes102

Cited sources2114

Indicated uses

Only Fennel

Infection (general)Pain (general)Wounds

Shared (5)

BronchitisCoughMenstrual crampsMuscle spasmRespiratory support

Only Ivy Leaf

Asthma

Pharmacological actions

Only Fennel

Antimicrobial

Shared (2)

AntispasmodicExpectorant

Only Ivy Leaf

Bronchodilator / anti-asthmatic

Evidence face-off — shared uses

Condition	Fennel	Ivy Leaf	Verdict
Bronchitis	1/10	7/10	Stronger for Ivy Leaf
Cough	1/10	7/10	Stronger for Ivy Leaf
Menstrual cramps	9/10	3/10	Stronger for Fennel
Muscle spasm	1/10	3/10	Stronger for Ivy Leaf
Respiratory support	1/10	7/10	Stronger for Ivy Leaf

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

Essential oil (mainly trans-anethole, with fenchone and estragole/methyl chavicol)^{[1, 3, 7]}

The aromatic volatile oil of the seed; trans-anethole is the principal component and is associated with the antispasmodic, carminative and estrogen-like activity.

Essential (volatile) oil

Flavonoids (quercetin, rutin and kaempferol glycosides)^[3]

Antioxidant polyphenolic constituents.

FlavonoidsGlycosidesKaempferolQuercetinRutin

Phenolic acids (chlorogenic, caffeic and rosmarinic acids)^{[3, 8]}

Antioxidant and anti-inflammatory constituents.

Rosmarinic acidPhenolic acidsChlorogenic acidCaffeic acid

Fatty acids (chiefly petroselinic acid) and amino acids^[3]

Major constituents of the fruit/seed oil.

Triterpene saponins (hederacoside C, alpha-hederin)^{[4, 5, 7, 8, 12, 13]}

The secretolytic and antispasmodic active constituents; extracts are standardised to them.

Triterpene saponinsTerpenes / terpenoidsSaponins

Flavonoids and phenolic acids^[12]

Antioxidant supporting constituents.

Phenolic acidsFlavonoids

Pharmacological Actions

Antimicrobial^{[1, 3, 9, 14]}

Antispasmodic^{[3, 14]}

Antispasmodic (cramp easing)

Expectorant^{[3, 14]}

Antispasmodic^{[5, 7, 10, 12]}

Antispasmodic / bronchodilatory - eases coughing fits and breathlessness

Bronchodilator / anti-asthmatic^{[5, 12]}

Antispasmodic / bronchodilatory - eases coughing fits and breathlessness

Expectorant^{[1, 2, 3, 12, 13, 14]}

Expectorant / secretolytic for productive cough and acute bronchitis (loosens and helps clear mucus)

Traditional & Indicated Uses

Bronchitis^{[3, 14]}Traditional · 1/10

inferred from expectorant action

Evidence: 1

Label: Bronchitis

Cough^{[3, 14]}Traditional · 1/10

inferred from expectorant action

Evidence: 1

Label: Cough

Infection (general)^{[3, 14]}Traditional · 1/10

inferred from antimicrobial action

Evidence: 1

Label: Infection (general)

Menstrual cramps^{[6, 11, 12]}Strong · 9/10

Relieves primary dysmenorrhoea (menstrual) pain - meta-analyses of RCTs find fennel reduces pain intensity versus placebo, comparable to mefenamic acid

Evidence: 9

Label: Menstrual cramps

Muscle spasm^{[3, 14]}Traditional · 1/10

inferred from antispasmodic action

Evidence: 1

Label: Muscle spasm

Pain (general)^{[6, 12]}Good · 8/10

Relieves primary dysmenorrhoea (menstrual) pain - meta-analyses of RCTs find fennel reduces pain intensity versus placebo, comparable to mefenamic acid

Evidence: 8

Label: Pain (general)

Respiratory support^{[3, 14]}Traditional · 1/10

inferred from expectorant action

Evidence: 1

Label: Respiratory support

Wounds^{[3, 14]}Traditional · 1/10

inferred from antimicrobial action

Evidence: 1

Label: Wounds

Asthma^[12]Limited · 3/10

inferred from bronchodilator action

Evidence: 3

Label: Asthma

Bronchitis^{[12, 13, 14]}Good · 7/10

Expectorant / secretolytic for productive cough and acute bronchitis (loosens and helps clear mucus)

Evidence: 7

Label: Bronchitis

Cough^{[12, 13, 14]}Good · 7/10

Expectorant / secretolytic for productive cough and acute bronchitis (loosens and helps clear mucus)

Evidence: 7

Label: Cough

Menstrual cramps^[12]Limited · 3/10

inferred from antispasmodic action

Evidence: 3

Label: Menstrual cramps

Muscle spasm^[12]Limited · 3/10

inferred from antispasmodic action

Evidence: 3

Label: Muscle spasm

Respiratory support^{[12, 13, 14]}Good · 7/10

inferred from expectorant action

Evidence: 7

Label: Respiratory support

Safety, Cautions & Contraindications

Safety note^[14]Info

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.

Safety note^[14]Caution

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.

Safety note^[14]Info

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.

Safety note^[14]Caution

Pregnancy: Fennel is possibly unsafe to use when pregnant. Regularly using fennel has been linked to preterm birth.

Safety note^[14]Info

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.

Safety note^[14]Info

Children: Fennel is possibly safe when used at appropriate doses for up to one week in young infants with colic.

Safety note^[14]Info

Allergy to celery, carrot or mugwort: Fennel might cause an allergic reaction in people who are sensitive to these plants.

Safety note^[14]Info

Bleeding disorders: Fennel might slow blood clotting. Taking fennel might increase the risk of bleeding or bruising in people with bleeding disorders.

Safety note^[14]Caution

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)

Safety note^{[14, 15]}Caution

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).

Safety note^[12]Info

Generally well tolerated; occasional gastrointestinal upset or, rarely, allergic reaction. Use only standardised extract products - the fresh raw plant contains irritant saponins and falcarinol that can cause contact dermatitis.

Safety note^[12]Caution

A cough lasting more than a week, or with fever, breathlessness or purulent sputum, needs medical assessment. Safety in pregnancy and breastfeeding is not established.

External Ids

Gbif: 3034922

Wikidata: Q43511

Gbif: 8351737

Wikidata: Q26354

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]

Height: 1-2 m

Habit: Aromatic, robust perennial herb (often grown as annual/biennial)

Leaves: Finely divided into thread-fine, hair-like, feathery segments

Flowers: Small yellow flowers in large flat compound umbels

Stem: Smooth, waxy, blue-green, hollow, unspotted

Root: Thick taproot, swollen and bulb-like in the Florence fennel variety

Fruit: Ridged, aromatic, aniseed-scented seed (mericarp)

Flowering Period: July-October

Woody, evergreen climbing or trailing vine that attaches to surfaces by small aerial rootlets. Juvenile leaves are glossy, dark green with three to five lobes; mature, flowering growth on well-lit stems produces unlobed, oval leaves. Small, greenish-yellow flowers in rounded umbels appear in autumn on mature growth, followed by black berries.^[12]

Height: Climbing/trailing to 20-30 m where supported

Habit: Woody, evergreen climbing or trailing vine

Leaves: Juvenile leaves glossy, three- to five-lobed; mature leaves unlobed, oval

Flowers: Small, greenish-yellow, in rounded umbels, on mature flowering growth

Stem: Woody, climbing by small aerial rootlets

Root: Woody root system plus climbing aerial rootlets

Fruit: Black berry (toxic if eaten in quantity - not used medicinally)

Flowering Period: Autumn (on mature growth only)

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 as a climbing or ground-covering evergreen on trees, walls, buildings and woodland floors, tolerant of shade; native to Europe and Western Asia and widely naturalised elsewhere.

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]

Parts: Leaf, Root, Seed

Season: Leaf through summer; seed in autumn; bulb before flowering

Juvenile (lobed) leaves are picked for medicinal use, typically in spring to summer, then dried and processed into standardised extract; the fresh raw leaf is not used directly due to irritant saponins.

Parts: Leaf (standardised dry extract)

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]

Ivy leaf has a long European folk history as an expectorant remedy for coughs and chest complaints, and modern standardised leaf extracts are among the best-studied herbal treatments for acute bronchitis and productive cough, shown in clinical trials to reduce cough severity and ease breathing.^[12]

Preparations

Infusion (seed)^[3]

Crushed seed infused in hot water as the classic carminative digestive tea.

Standardised extract^[12]

Seed extract studied in randomised trials for primary dysmenorrhoea (menstrual pain).

Standardised dry extract (syrup/drops)^[12]

Leaf extract standardised to saponin (hederacoside C) content, formulated as a cough syrup or drops; the well-studied clinical form for acute bronchitis and productive cough.

Dosage

Seed infusion^[13]

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.

Standardised extract (syrup)^[12]

Commercial standardised ivy-leaf syrups are typically dosed per product labelling (varying by age); clinical trials show benefit within about 48 hours of starting treatment. Educational reference only, not a prescription.

References

REF-1641, REF-1642, REF-0537, REF-1643, REF-1644, REF-0605, REF-1645, REF-1646, REF-1656, REF-1657, REF-2586

REF-0833, REF-0834, REF-0835, REF-2308, REF-2309, REF-2310, REF-2311, REF-2312, REF-2313, REF-2314, REF-2315

Lookalikes Review

Outcome: has-lookalikes

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-06

Outcome: none-known

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-07

Dangerous Lookalikes

Safety note^{[16, 17, 18]}Fatal

Dangerous Plant: conium-maculatum

Confused Part: Feathery foliage, stems and seeds - the whole above-ground plant. Both are tall Apiaceae with finely divided leaves, white or greenish compound umbels and hollow jointed stems, so a forager reaching for aniseed 'wild fennel' can grasp poison hemlock instead.

Confusion Context: Fennel (Foeniculum vulgare) is explicitly named as an edible confused with poison hemlock: King County (Washington) states that poison hemlock can be confused with many edible members of the parsley family including fennel, chervil and anise. Conium maculatum contains the piperidine alkaloid coniine and kills by ascending flaccid paralysis and respiratory failure; ingestion mistaken for edible umbellifers has caused fatal and near-fatal poisonings, and it is the plant analysed as the likely agent in the death of Socrates (Dayan 2024).

Distinguishing Features: CRUSH-AND-SMELL (decisive): fennel smells strongly and pleasantly of anise/liquorice. Poison hemlock has a rank, musty, mouse-like smell with no anise note., Stem markings: fennel has a smooth, waxy, blue-green stem with NO purple. Poison hemlock's smooth hairless hollow stem is conspicuously spotted and streaked with red-purple, especially near the base., Leaf texture: fennel leaves are thread-fine, almost hair-like filaments. Poison hemlock leaves are broader, flat, fern-like segments with toothed edges.

Key Test: Crush a leaf or stem and smell it: sweet anise/liquorice = fennel; rank musty/mousy = poison hemlock. Confirm by checking the lower stem for red-purple blotching (present on hemlock, absent on fennel's clean blue-green waxy stem). If the anise smell is absent OR any purple stem-spotting is present, do not eat it. Very young hemlock may not yet show strong purple, so rely first on the smell.

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-06

Safety note^{[19, 20, 21]}Dangerous

Dangerous Plant: aethusa-cynapium

Confused Part: Finely divided foliage and small white compound umbels. As a slender Apiaceae with dissected leaves and white umbels, fool's parsley falls into the same lacy white-flowered umbellifer pool a fennel forager must rule out.

Confusion Context: Aethusa cynapium (fool's parsley, dog poison, lesser hemlock) is a toxic umbellifer historically confused with edible parsley-family plants. It contains toxic alkaloids; documented effects include inflammation of the mouth and throat, abdominal pain, confusion, blurred vision and pupil dilation, and its genuine toxicity is confirmed experimentally (Teuscher et al. 1990). Direct fennel confusion is weaker than for hemlock because fool's-parsley leaves are flat and parsley-like rather than thread-fine, but it shares the fennel umbel gestalt and is dangerous, so it must be ruled out.

Distinguishing Features: BRACTEOLE 'beard' (in flower): below each secondary umbel, fool's parsley bears three to four long, narrow, downward-hanging strongly reflexed bracteoles forming a distinctive drooping beard. Fennel has no such conspicuous drooping bracteoles under its umbellets., Smell when crushed: fennel is sweetly aniseed/liquorice; fool's parsley gives off an acrid, foetid, mouse-like odour., Leaf form: fennel leaves are thread-fine hair-like filaments; fool's-parsley leaves are flatter, darker green and parsley-like, not thread-fine.

Key Test: Look under a secondary flower cluster for the three to four long, narrow, downward-drooping bracteoles (the beard) - diagnostic for fool's parsley and absent in fennel. Combine with crush-and-smell (sweet anise = fennel; acrid/foetid = fool's parsley). If a drooping bracteole beard is present or the smell is foetid, do not eat it.

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-06

Not documented

References & Sources

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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
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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
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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
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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
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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
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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
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https://doi.org/10.1080/15563650.2024.2309328
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https://kingcounty.gov/en/dept/dnrp/nature-recreation/environment-ecology-conservation/noxious-weeds/identification-control/poison-hemlock
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https://www.growforagecookferment.com/poison-hemlock/
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https://pubmed.ncbi.nlm.nih.gov/2236201/
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https://www.minnesotawildflowers.info/flower/fools-parsley
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https://fermanagh.bsbi.org/aethusa-cynapium-l

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