Herb reference

Coriander

Coriandrum sativum L.

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This library is designed to help readers orient, compare, and research. It is not a substitute for medical care or practitioner judgment.

Botanical / editorial

Family: Apiaceae
Plant type: annual herb
Route: Mixed route
Evidence tier: Mixed evidence

Mediterranean region, western Asia, northern Africa7000+Apiaceae

Botanical / meta

Botanical identity

Botanical description

Coriander is a slender, branching annual herb growing 30–70 cm tall, with finely divided, feathery upper leaves and broader, lobed lower leaves. Small white to pale mauve flowers are borne in compound umbels, followed by round, ribbed, beige-tan schizocarp fruits (seeds) approximately 3–5 mm in diameter, each containing two mericarps. The dried seeds have a warm, citrusy, slightly sweet aroma completely different from the fresh leaves (cilantro). Coriander seeds should not be confused with the fresh leaf (cilantro), as they have distinct chemical profiles and uses.

Pharmacognosy intro

Coriander seed essential oil contains 60–80% linalool (the dominant compound), with geraniol, terpinen-4-ol, γ-terpinene, camphor, geranyl acetate, and linalyl acetate as secondary constituents. The seed also contains fixed oil (up to 20%), coumarins (umbelliferone, bergapten — a photosensitising furanocoumarin), and phenolic acids. Linalool accounts for the seed's characteristic warm, sweet-citrus aroma and contributes anxiolytic, antimicrobial, and anti-inflammatory properties in experimental studies. The coumarin fraction has documented anticoagulant effects at high concentrations. The phenolic compounds (including protocatechuic acid and glycosides) provide antioxidant activity.

Editorial orientation

The practical read

Body-first read

What it is for

Route panel

Preparation shapes the claim

Evidence and safety may differ by preparation. Essential oil, tea, tincture, extract, infused oil, and topical use are not interchangeable.

Mixed route

Quality

Fresh, dried, oil, and garden read

Growing tips

Coriander is a cool-season annual that bolts quickly in hot weather. Sow seeds directly where they will grow, as it does not transplant well. It prefers full sun to partial shade (in hot climates), well-drained, moderately fertile soil, and consistent moisture. Harvest seeds when they turn tan and begin to drop from the umbels; cut entire seed heads and dry in paper bags. For seed production, space plants 15–20 cm apart. Coriander self-seeds readily in favourable conditions.

Quality notes

Whole coriander seeds should be round, uniformly tan to beige, and highly aromatic with a warm, sweet-citrus scent. The seeds should be free from mould, off-odours, or excessive breakage. Ground coriander loses volatile oils within 3–6 months. Essential oil should contain a minimum of 60% linalool for quality assurance. Russian and Moroccan coriander seeds are prized for their superior flavour profile. Store whole seeds in airtight containers away from light and heat. The seeds can be lightly toasted before grinding to enhance flavour.

Companion

Crystal pairing reference

Crystal side

Companion crystal

The deeper layer

Compound and clinical layer

Clinical and compound notes are included as a research layer, not as treatment instructions.

Safety intro

Coriander seed is GRAS as a culinary spice and is generally well tolerated. The essential oil, when consumed in large quantities, contains furanocoumarins (including bergapten) that can cause phytophotodermatitis — a severe inflammatory skin reaction when skin contact with the oil is followed by UV exposure. Rare allergic reactions occur, particularly in individuals sensitised to other Apiaceae family members (celery, fennel, dill, caraway, parsley, anise). Coriander seed may lower blood sugar levels; individuals with diabetes should monitor glucose when using concentrated extracts. Theoretically, coriander may interact with anticoagulant medications due to coumarin content, though this is not well documented at culinary doses. Avoid medicinal doses of the essential oil during pregnancy. Some coriander oils may inhibit CYP2D6 enzyme activity in vitro, suggesting potential drug interaction concerns at supplemental doses.

Questions

Frequently asked about Coriander

What are the safety concerns and drug interactions for coriander?

Coriander seed (Coriandrum sativum) is GRAS as a culinary spice and generally well tolerated. The essential oil in large amounts contains furanocoumarins including bergapten that can cause phytophotodermatitis, a severe skin reaction when oil contact is followed by UV exposure. Rare allergic reactions occur, especially in people sensitised to other Apiaceae such as celery, fennel, dill, caraway, parsley, and anise. Coriander seed may lower blood sugar, so people with diabetes should monitor glucose when using concentrated extracts, and its coumarin content raises a theoretical anticoagulant interaction, though this is not well documented at culinary doses. Some coriander oils inhibit CYP2D6 in vitro, suggesting possible drug interactions at supplemental levels. Avoid medicinal doses of the essential oil during pregnancy.

How is coriander seed prepared and dosed?

Coriander seeds are typically dry-toasted briefly to bloom their aroma, then ground fresh just before use, since the volatile linalool-rich oil fades quickly once the seed is broken. Whole seeds are used in pickling, brines, and braises, while ground seed flavours spice blends and curries. There is no fixed medicinal dose for culinary use; it is used to taste. Toasting should stop the moment the seeds smell fragrant and turn one shade darker, as scorching turns the flavour bitter. For digestive infusions, lightly crushed seeds are steeped in hot water. Concentrated essential oil should be reserved for experienced use given its furanocoumarin content.

How do you evaluate coriander seed quality?

Quality coriander seeds are round, pale tan to light brown, uniform in size, and intact rather than cracked or dusty, and they should release a warm, sweet, citrus-floral aroma when crushed. Two cultivar types exist: the larger, rounder Coriandrum sativum var. vulgare and the smaller var. microcarpum, the latter generally higher in essential oil. A heavy proportion of broken seeds, powder, or stalk debris signals age or poor handling. Pre-ground coriander is the most degraded form because the volatile oil dissipates rapidly after milling. The strength and freshness of the crushed-seed aroma is the most reliable quality indicator, since a faint smell means the linalool has largely gone.

What makes coriander seed distinct from other Apiaceae carminative spices?

Coriander seed sits within the Apiaceae family of carminative spices alongside cumin, dill, caraway, and anise, but its chemistry sets it apart: the seed essential oil is 60 to 80 percent linalool, giving its characteristic warm, sweet-citrus aroma, whereas cumin is defined by cuminaldehyde, dill and caraway by carvone, and anise by anethole. This linalool dominance is also what distinguishes coriander seed from cilantro leaf, which comes from the same plant but is dominated instead by aliphatic aldehydes. Linalool contributes anxiolytic, antimicrobial, and anti-inflammatory effects in experimental studies, while the seed's coumarin fraction (umbelliferone, bergapten) accounts for its photosensitising and mild anticoagulant potential. Recognising the linalool signature is the key to using coriander correctly rather than treating all warm seed spices alike.

How should coriander seed be stored and what is its shelf life?

Whole coriander seeds keep their aroma well for about one to two years when stored in an airtight container away from light, heat, and humidity. Ground coriander degrades much faster, losing its volatile linalool within a few months, so grinding small amounts as needed preserves the most flavour. Toasted and ground seed should be used promptly rather than stored. Keep the container sealed tightly, as the seeds readily absorb ambient odours and moisture. When crushed seeds no longer give a clear sweet-citrus scent, the essential oil has significantly diminished and the spice should be replaced.

Sources & Citations

Where this entry can be checked

Peer-reviewed sources for the pharmacological and clinical claims on this page. Crystalis herb entries describe tradition and current research; they are reference, not medical advice.

01
SCI
Coriander (Coriandrum sativum): A promising functional food toward the well-being
Prachayasittikul V, Prachayasittikul S, Ruchirawat S, Prachayasittikul V. (2018). Coriander (Coriandrum sativum): A promising functional food toward the well-being. Food Research International. [SCI]DOI 10.1016/j.foodres.2017.11.019
02
SCI
Coriander: A holistic outlook on its chemistry and pharmacology
Chaurasia PK, et al. (2025). Coriander: A holistic outlook on its chemistry and pharmacology. Food Chemistry. [SCI]DOI 10.1016/j.foodchem.2024.142444

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