Limited evidenceGut health

Coriander Seed

A carminative spice used for bloating and cramping. The two supporting trials both tested coriander inside multi-herb formulas, so the effect cannot be attributed to coriander itself.

Evidence last reviewed: August 2026

What the science says

Functional dyspepsia Limited evidence
A double-blind randomised trial in 90 patients gave 500 mg twice daily of a formula combining Bunium persicum and Coriandrum sativum and reported significant improvement in dyspepsia severity and quality of life over 4 weeks. Coriander was one of two herbs, so its individual contribution is unknown.
IBS pain and bloating Limited evidence
A small pilot study of Carmint, a formula of coriander, lemon balm and mint, reported reduced abdominal pain and bloating in IBS patients. It was a pilot, on a combination product, and has not been replicated.
Coriander seed alone Limited evidence
No placebo-controlled trial has tested isolated coriander seed or its oil for any digestive outcome in humans; the rationale is traditional use and antispasmodic activity in isolated tissue.

Dosage & safety

Studied doseThe dyspepsia trial used 500 mg of the combined herbal powder twice daily. As a single herb, typical label doses are 500–1000 mg of seed powder or 1–2 g brewed as tea. No dose-finding work exists.

SafetySafe as a food and generally well tolerated. Coriander is a known contact and occasionally systemic allergen, and people allergic to other Apiaceae (celery, fennel, carrot, mugwort) may react. High doses may add to blood-sugar-lowering and sedative medication. Concentrated seed oil should not be taken undiluted.

Scientific references

The Efficacy of the Herbal Formula of Bunium persicum and Coriandrum sativum on Clinical Symptoms of Patients with Functional Dyspepsia: A Double-Blind Randomized Controlled Trial
Azimi M, Esfandiarpour M, Raeiszadeh M — Complement Med Res, 2024
The efficacy of an herbal medicine, Carmint, on the relief of abdominal pain and bloating in patients with irritable bowel syndrome: a pilot study
Vejdani R, Shalmani HR, Mir-Fattahi M — Dig Dis Sci, 2006

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