Ajwain | whatsinit

About

What it is and where it shows up.

Ajwain (Trachyspermum ammi, family Apiaceae) is an annual herb native to Egypt and widely cultivated in India, Iran, and Pakistan, whose small seed-like fruits are used as a pungent spice and flavouring agent in cooking. The seeds contain 2–4.4% volatile oil dominated by thymol, γ-terpinene, and p-cymene, which give ajwain its characteristic aroma and account for its carminative, antimicrobial, and antispasmodic properties.

Safety summary

The regulatory and scientific consensus.

Ajwain seeds are considered safe at normal culinary quantities, with acute and sub-acute toxicity studies in rats reporting no toxicity and an LD50 exceeding 3000 mg/kg. However, the plant has documented abortifacient pharmacological activity, making high-dose supplemental use inadvisable during pregnancy. No formal Acceptable Daily Intake (ADI) has been established by FSSAI, FDA, or EFSA, as ajwain is regulated as a traditional whole spice rather than an isolated food additive.

Regulatory landscape

What food-safety regulators have decided.

Jurisdiction	Status	Note
EFSA (European Food Safety Authority) (European Union)	Approved	Ajwain is used as a culinary spice and herbal flavouring in the EU under Regulation (EC) No 1334/2008 on flavourings. No E number assigned (it is a whole/dried spice, not an isolated additive). No formal ADI established.source
FSSAI (Food Safety and Standards Authority of India) (India)	Approved	Ajwain is recognised as a traditional spice and condiment under the Food Safety and Standards (Food Products Standards and Food Additives) Regulations, 2011. No specific ADI or maximum use level established; regulated as a whole-food spice ingredient.source
FDA (Food and Drug Administration) (United States)	Approved	Ajwain (ajowan) is used as a spice and natural flavouring substance. Its primary active constituent thymol is listed as a natural flavouring substance generally recognised as safe (GRAS) under 21 CFR §182.20. No specific ADI established for the whole spice.source

Who should approach with care

Whose guidance would steer them away.

Pregnancy — Trachyspermum ammi has documented abortifacient pharmacological activity in traditional medicine and experimental studies, making high-dose or supplemental use during pregnancy inadvisable.

Infants — High thymol content in concentrated ajwain preparations may be irritating to the gastrointestinal tract of infants; culinary quantities in food are generally considered acceptable, but supplemental forms should be avoided.

Other — Ajwain seed extract has been shown to significantly prolong prothrombin time (PT) in animal studies, indicating a potential interaction with anticoagulant drugs such as warfarin via the extrinsic coagulation pathway.

Research citations

The sources behind this verdict.

1PubMed. Biomedical and Industrial Applications of Trachyspermum ammi-Derived Nanoparticles: A Comprehensive Review, 2025. pmc.ncbi.nlm.nih.gov
2PubMed. Acute and Sub-Acute Toxicity Studies and Pharmacodynamic Studies of Standardized Extract of Trachyspermum ammi (L.) Sprague (Fruits) Against Chemically Induced Inflammation in Rats, 2020. pubmed.ncbi.nlm.nih.gov
3PubMed. Carum copticum L.: A Herbal Medicine with Various Pharmacological Effects, 2014. pmc.ncbi.nlm.nih.gov
4PubMed. Analysis of the Essential Oil Components from Different Carum copticum L. Samples from Iran, 2014. pmc.ncbi.nlm.nih.gov
5PubMed. Trachyspermum ammi, 2012. pmc.ncbi.nlm.nih.gov

Independently researched5 citations