Plant Profile

Ajwain

Compiled by the Omnia Sana editorial team from the plant database ·Last updated August 15, 2026

Trachyspermum ammi

Family: Apiaceae · Parts used: Leaf, Root, Seed · Also known as: Ajowan

The complete database record: 2 documented constituents, 1 pharmacological action, 5 traditional / indicated uses, with 17 cited sources.

Botanical Description

Slender annual herb with finely divided, feathery leaves, resembling a smaller parsley. Small white flowers are borne in flat-topped umbels, giving way to small, ridged, aromatic, oval seeds (technically schizocarps) that are the primary part used.^[12]

Height: 30-90 cm

Habit: Slender, erect annual herb

Leaves: Finely divided, feathery, parsley-like

Flowers: Small, white, in flat-topped umbels

Stem: Erect, branching, ridged

Root: Fibrous taproot

Fruit: Small, ridged, aromatic, oval seed (schizocarp), the main part used

Flowering Period: Summer (varies by growing region)

Habitat & Distribution

Cultivated as an annual crop, mainly in India, Iran, Pakistan, Afghanistan and Egypt; believed native to the eastern Mediterranean region.^[13]

Harvesting

Seeds are harvested when the umbels dry and turn brown, then threshed and dried further; leaves are gathered fresh through the growing season and the root is dug when needed.^[12]

Parts: Leaf, Root, Seed

Season: Seed at late-season maturity; leaf through growing season

Key Constituents

Essential oil rich in thymol^{[1, 15]}

Thymol is the principal active constituent, responsible for most of the antimicrobial, antispasmodic and carminative activity.

Essential (volatile) oilThymol

Carvacrol and other monoterpenes^[15]

Secondary aromatic constituents contributing to the antimicrobial profile.

CarvacrolTerpenes / terpenoids

Pharmacological Actions

Digestive aid^{[1, 2, 12, 13, 15, 16]}

Traditional & Indicated Uses

Bloating^{[1, 12, 13, 15, 16]}Preliminary · 1/10

inferred from digestive action

Evidence: 1

Label: Bloating

more plants for bloating →detailed sources →

Indigestion^{[1, 2, 6, 12, 13, 15, 16]}Preliminary · 2/10

inferred from digestive action

Evidence: 2

Label: Indigestion

more plants for indigestion →detailed sources →

Menstrual cramps^{[1, 12, 13, 15, 16]}Preliminary · 1/10

Evidence: 1

Label: Menstrual cramps

more plants for menstrual cramps →detailed sources →

Oral & throat health^{[1, 10, 12, 13, 15, 16]}Preliminary · 2/10

Evidence: 2

Label: Oral & throat health

more plants for oral & throat health →detailed sources →

Respiratory support^{[1, 12, 13, 15, 16]}Preliminary · 1/10

Evidence: 1

Label: Respiratory support

more plants for respiratory support →detailed sources →

Traditional Use & History

Ajwain seed has a long South Asian and Middle Eastern culinary and Ayurvedic tradition as a warming digestive carminative for bloating and indigestion, an antispasmodic for menstrual cramps, an oral-health antiseptic, and a respiratory-supportive remedy, with its high thymol content underlying much of its antimicrobial and antispasmodic activity.^{[1, 12, 15]}

Preparations

Seed infusion/chewed seed^[12]

Whole seeds chewed after meals or infused in hot water as the classic digestive preparation.

Diluted essential oil (topical/oral-care)^[1]

Essential oil, well diluted, used in oral-care preparations; not taken undiluted internally due to thymol content.

Dosage

Seed^[1]

Traditional sources suggest around 3-6 g of powdered seed daily, or 125 mg of a standardized extract. Educational reference only, not a prescription.

Safety, Cautions & Contraindications

Safety note^{[1, 12, 13, 15, 16]}Caution

Generally safe at culinary amounts used in Indian and Middle Eastern cooking. Ajwain essential oil is highly concentrated and should not be ingested in large quantities - thymol toxicity can cause nausea, vomiting, and central nervous system effects at high doses. May increase photosensitivity (phototoxic potential of essential oil). May mildly lower blood pressure and blood sugar - caution when combined with antihypertensive or antidiabetic medications. Contains thymol, which may enhance anticoagulant effects at very high doses. Not recommended in medicinal doses during pregnancy (has emmenagogue properties in traditional use) or breastfeeding. Avoid in large amounts with peptic ulcer as it may aggravate gastric acidity in some individuals (Bairwa et al., 2012).

Safety note^{[1, 12, 13, 15, 16, 17]}Info

According to Duke (2002), ajowan essential oil is fungitoxic at 500 ppm and possesses spasmogenic activity. The oil is rich in thymol, which may be responsible for many of the plant's biological activities including its antispasmodic, carminative, and antimicrobial effects. Recommended dosage in traditional medicine is 3–6 g of powdered seed, or 125 mg of standardized extract (Duke, 2002).

Harvest Readiness

^[14]

Part: seed

Signals: Harvest the seed (fruit) when fully ripe, in summer, then dry or distil for the oil.

Basis: traditional

Source Quote: The seed is harvested when fully ripe and either distilled for the essential oil or dried for later use.

Species Confirmed: 1

Notes: PFAF (REF-3352); the seed is harvested when fully ripe (seeds ripen July-August). Single lineage -> provisional. (Leaf and root, also listed parts, were not separately timing-sourced this pass.)

External Identifiers

GBIF ›Wikidata ›

References & Sources

Bairwa, R., Sodha, R.S. and Rajawat, B.S (2012) 'Trachyspermum ammi', 6(11), pp. 56--60. doi:10.4103/0973-7847.95871 Traditional / reference
https://doi.org/10.4103/0973-7847.95871
Eftekhari, M., Hoseinsalari, A., Mansourian, M., Farjadmand, F., Shams Ardekani, M.R., Sharifzadeh, M., Hassanzadeh, G., Khanavi, M. and Gholami, M (2019) 'Trachyspermum ammi (L.) Sprague, superb essential oil and its major components on peptic ulcers: in vivo combined in silico studies', DARU Journal of Pharmaceutical Sciences, 27(1), pp. 317-327. doi:10.1007/s40199-019-00279-y Preclinical
https://doi.org/10.1007/s40199-019-00279-y
Khan, A. and Gilani, A.H (2023) 'An insight investigation to the antiurolithic activity of Trachyspermum ammi using the in vitro and in vivo experiments', Urolithiasis, 51(1), pp. 43. doi:10.1007/s00240-023-01415-9 Preclinical
https://doi.org/10.1007/s00240-023-01415-9
Soni, K. and Parle, M (2017) 'Trachyspermum ammi Seeds Supplementation Helps Reverse Scopolamine, Alprazolam and Electroshock Induced Amnesia', Neurochemical Research, 42(5), pp. 1333-1344. doi:10.1007/s11064-017-2177-0 Preclinical
https://doi.org/10.1007/s11064-017-2177-0
Gupta, B.D., Kar, A., Narayan, S., Thakur, C.P., Mukherjee, P.K. and Haldar, P.K (2023) 'Ultra-performance liquid chromatography-Quadrupole time-of-flight tandem mass spectrometry-based metabolite profiling, quality evaluation, and marker analysis of Trachyspermum ammi (L.) Sprague by high-performance thin-layer chromatography', Journal of Separation Science, 46(10), pp. e2200872. doi:10.1002/jssc.202200872 Preclinical
https://doi.org/10.1002/jssc.202200872
Arasu, A., Pingley, V., Prabha, N., O V, R., Annathurai, K., Kasirajan, S., Govindasamy, A., Alwahibi, M.S., Elshikh, M.S., Abdel Gawwad, M.R. and Arockiaraj, J (2021) 'Impact and fungitoxic spectrum of Trachyspermum ammi against Candida albicans, an opportunistic pathogenic fungus commonly found in human gut that causes Candidiasis infection', Journal of Infection and Public Health, 14(12), pp. 1854-1863. doi:10.1016/j.jiph.2021.09.027 Preclinical
https://doi.org/10.1016/j.jiph.2021.09.027
Sharifzadeh, A., Khosravi, A.R., Shokri, H. and Sharafi, G (2015) 'Antifungal effect of Trachyspermum ammi against susceptible and fluconazole-resistant strains of Candida albicans', Journal de Mycologie Medicale, 25(2), pp. 143-150. doi:10.1016/j.mycmed.2015.03.008 Preclinical
https://doi.org/10.1016/j.mycmed.2015.03.008
Petramfar, P., Moein, M., Samani, S.M., Tabatabaei, S.H. and Zarshenas, M.M (2016) 'Trachyspermum ammi 10% topical cream versus placebo on neuropathic pain, a randomized, double-blind, placebo-controlled trial', Neurological Sciences, 37(9), pp. 1449-1455. doi:10.1007/s10072-016-2600-3 Randomized trial
https://doi.org/10.1007/s10072-016-2600-3
Saleem, U., Riaz, S., Ahmad, B. and Saleem, M (2017) 'Pharmacological Screening of Trachyspermum ammi for Antihyperlipidemic Activity in Triton X-100 Induced Hyperlipidemia Rat Model', Pharmacognosy Research, 9(Suppl 1), pp. S34-S40. doi:10.4103/pr.pr_37_17 Preclinical
https://doi.org/10.4103/pr.pr_37_17
Dadpe, M.V., Dhore, S.V., Dahake, P.T., Kale, Y.J., Kendre, S.B. and Siddiqui, A.G (2018) 'Evaluation of antimicrobial efficacy of Trachyspermum ammi (Ajwain) oil and chlorhexidine against oral bacteria: An in vitro study', Journal of the Indian Society of Pedodontics and Preventive Dentistry, 36(4), pp. 357-363. doi:10.4103/JISPPD.JISPPD_65_18 Preclinical
https://doi.org/10.4103/JISPPD.JISPPD_65_18
Arabi Monfared, A., Ayatollahi Mousavi, S.A., Zomorodian, K., Mehrabani, D., Iraji, A. and Moein, M.R (2020) 'Trachyspermum ammi aromatic water: A traditional drink with considerable anti-Candida activity', Current Medical Mycology, 6(3), pp. 1-8. doi:10.18502/cmm.6.3.3979 Preclinical
https://doi.org/10.18502/cmm.6.3.3979
Awan, S.J., Kanwal, M., Riaz, M.N. et al (2021) 'A Review on the Medicinal Potential of Trachyspermum ammi', pp. 302--311. doi:10.9734/jpri/2021/v33i41B32457 Traditional / reference
https://doi.org/10.9734/jpri/2021/v33i41B32457
Royal Botanic Gardens, Kew (n.d.) 'Trachyspermum ammi (L.) Sprague'. Available at: https://powo.science.kew.org/taxon/urn:lsid:http://ipni.org:names:436285-1 Traditional / reference
https://powo.science.kew.org/taxon/urn:lsid:http://ipni.org:names:436285-1
Plants For A Future 'Trachyspermum ammi (Ajwain, Bishop's Weed)'. Available at: https://pfaf.org/user/Plant.aspx?LatinName=Trachyspermum+ammi Traditional / reference
https://pfaf.org/user/Plant.aspx?LatinName=Trachyspermum+ammi
Boskabady, M.H., Alitaneh, S. and Alavinezhad, A (2014) 'Carum copticum L.: A Herbal Medicine with Various Pharmacological Effects'. doi:10.1155/2014/569087 Traditional / reference
https://doi.org/10.1155/2014/569087
Shova, D.C., Shrestha, S., Sharma, S. and Dhakal, H (2020) 'GC-MS analysis, antibacterial, antioxidant study and brine shrimp lethality analysis of Trachyspermum ammi (L.) Sprague', 1(1), pp. 45--50. Traditional / reference
https://scholar.google.com/scholar?q=GC-MS%20analysis%2C%20antibacterial%2C%20antioxidant%20study%20and%20brine%20shrimp%20lethality%20analysis%20of%20Trachyspermum%20ammi%20%28L.%29%20Sprague
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

Selected studies & references

RctTrachyspermum ammi 10% topical cream versus placebo on neuropathic pain, a randomized, double-blind, placebo-controlled trial source↗ (2016)

PreclinicalAn insight investigation to the antiurolithic activity of Trachyspermum ammi using the in vitro and in vivo experiments source↗ (2023)

PreclinicalUltra-performance liquid chromatography-Quadrupole time-of-flight tandem mass spectrometry-based metabolite profiling, quality evaluation, and marker analysis of Trachyspermum ammi (L.) Sprague by high-performance thin-layer chromatography source↗ (2023)

PreclinicalImpact and fungitoxic spectrum of Trachyspermum ammi against Candida albicans, an opportunistic pathogenic fungus commonly found in human gut that causes Candidiasis infection source↗ (2021)

PreclinicalTrachyspermum ammi aromatic water: A traditional drink with considerable anti-Candida activity source↗ (2020)

PreclinicalTrachyspermum ammi (L.) Sprague, superb essential oil and its major components on peptic ulcers: in vivo combined in silico studies source↗ (2019)

PreclinicalEvaluation of antimicrobial efficacy of Trachyspermum ammi (Ajwain) oil and chlorhexidine against oral bacteria: An in vitro study source↗ (2018)

PreclinicalPharmacological Screening of Trachyspermum ammi for Antihyperlipidemic Activity in Triton X-100 Induced Hyperlipidemia Rat Model source↗ (2017)

All 16 studies in the Knowledge Finder →

Educational use only. This profile summarises traditional and scientific sources for reference. It is not medical advice and not a substitute for a qualified practitioner. Some plants carry safety cautions and drug interactions - always check before use.
This profile is assembled automatically from the Omnia Sana plant database, which we curate by hand. How this site is built.

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