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Tareh

Traditionally used for: Everyday cooking as part of a vegetable-rich diet. Digestion and appetite (traditional); Mild constipation (fibre effect).

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What is Tareh? Tareh is the Persian name for leek, a mild plant in the onion family. Cooks use the long green leaves and pale stem in soups, stews, herb rice and egg dishes. Persian and Unani healers also used it as a warming food to help digestion and to loosen a chesty cough. For almost everyone, tareh is food first. A cooked serving gives fibre, vitamin K, folate and the sulfur compounds that give the onion family its smell. The evidence line is simple. Tareh has a long, clear record in Persian and Unani kitchens and clinics, but we could not find human trials of leek itself for any health use. Long traditional use is not proof that something works, and that gap applies to every claim on this page. How does Tareh work? No one has shown how tareh acts in the body in people, so this part is a best guess. When you cut or chew leek, sulfur compounds form. In lab dishes these act as antioxidants (chemicals that shield cells from damage) and can make platelets (the cell bits that form clots) a little less sticky. Leek is also high in water and fibre, which is the most likely reason it helps some people pass stool more easily. That is a food effect, not a drug effect. What forms does Tareh come in? Fresh tareh is the main form. Cooks chop the green leaves and white stem into soup, stew, herb rice and omelettes. You can also buy it dried and crumbled, or frozen and chopped. Pressed leek juice, leek powder and capsules exist, but they are rare and not made to a set strength. Raw crushed leek is sometimes put on the skin in folk practice. This can sting and redden the skin, so we do not suggest it. Where it comes from: Leek is one of the oldest grown vegetables. It was eaten in ancient Egypt, Greece and Persia, and Roman writers praised it for the voice and the chest. Unani texts class leek as warm and dry. In that system it was used to stir appetite, move wind and thin thick phlegm (sticky mucus). In Iran today tareh is a kitchen staple rather than a medicine, in dishes such as ash soup and kuku sabzi.

Helps

What does Tareh help with? Sluggish digestion and poor appetite: This is the main Unani use. Leek was given as a warm, savoury food to wake up appetite and move trapped wind. There are no human trials testing leek for this. Some people find the opposite happens, because the fibre in leek causes gas and bloating. Mild constipation: Any help here comes from leek being a watery, high-fibre vegetable, like most greens. It is not special among vegetables. No trial has tested leek on its own for constipation. If stools stay hard for more than two weeks, or you see blood, get checked. Chesty cough with thick phlegm: Old Persian, Greek and Unani sources used leek broth to loosen phlegm (sticky mucus) and ease the chest. Warm liquid alone may explain most of the comfort people feel. There is no human trial of leek for cough. Leek is not a treatment for chest infection, asthma or COPD (a long-term lung disease). General diet quality: Studies that follow large groups of people link diets rich in onion-family vegetables with better heart and gut health. These studies watch habits; they cannot prove that leek caused the result. Eating tareh as part of a mixed vegetable diet is a reasonable, low-risk choice. Treat it as food, not as therapy.

Tareh

Quick Facts

  • What it is: Tareh is the Persian name for leek (Allium ampeloprasum), a mild onion-family vegetable used as both food and traditional remedy.
  • Main uses: Digestion and appetite (traditional), Mild constipation (fibre effect), Chesty cough with thick phlegm (traditional)
  • Best for: Everyday cooking as part of a vegetable-rich diet
  • Active ingredients: Sulfur compounds, Fructans (a gut-fermented plant fibre), Kaempferol and other flavonoids, Vitamin K, Folate
  • Forms: Fresh leaves and stem, Dried and crumbled, Frozen chopped, Pressed juice (rare), Powder or capsules (rare, not standardised)
  • Time to effect: Stool changes in one to three days; nothing here builds over months.
  • Side effects: Usually just gas, bloating and onion breath; allergy is rare.
  • Pregnancy & breastfeeding: Avoid in pregnancy and while breastfeeding.

Educational information, not medical advice — ask your doctor or midwife.

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What is Tareh?

Tareh is the Persian name for leek, a mild plant in the onion family. Cooks use the long green leaves and pale stem in soups, stews, herb rice and egg dishes. Persian and Unani healers also used it as a warming food to help digestion and to loosen a chesty cough.

For almost everyone, tareh is food first. A cooked serving gives fibre, vitamin K, folate and the sulfur compounds that give the onion family its smell.

The evidence line is simple. Tareh has a long, clear record in Persian and Unani kitchens and clinics, but we could not find human trials of leek itself for any health use. Long traditional use is not proof that something works, and that gap applies to every claim on this page.

How does Tareh work?

No one has shown how tareh acts in the body in people, so this part is a best guess.

When you cut or chew leek, sulfur compounds form. In lab dishes these act as antioxidants (chemicals that shield cells from damage) and can make platelets (the cell bits that form clots) a little less sticky.

Leek is also high in water and fibre, which is the most likely reason it helps some people pass stool more easily. That is a food effect, not a drug effect.

What forms does Tareh come in?

Fresh tareh is the main form. Cooks chop the green leaves and white stem into soup, stew, herb rice and omelettes.

You can also buy it dried and crumbled, or frozen and chopped. Pressed leek juice, leek powder and capsules exist, but they are rare and not made to a set strength.

Raw crushed leek is sometimes put on the skin in folk practice. This can sting and redden the skin, so we do not suggest it.

Where it comes from:

Leek is one of the oldest grown vegetables. It was eaten in ancient Egypt, Greece and Persia, and Roman writers praised it for the voice and the chest.

Unani texts class leek as warm and dry. In that system it was used to stir appetite, move wind and thin thick phlegm (sticky mucus).

In Iran today tareh is a kitchen staple rather than a medicine, in dishes such as ash soup and kuku sabzi.

Who should avoid Tareh?

  • Do not use if you take warfarin or another vitamin K–sensitive blood thinner and cannot keep your leek intake steady from week to week
  • Do not use if you take a blood thinner or antiplatelet drug (a medicine that stops clots) and want to start concentrated leek juice, powder or capsules without your doctor's agreement
  • Do not use if you have surgery planned in the next two weeks and are taking leek juice, powder or capsules
  • Do not use if you have chronic kidney disease (long-term kidney damage) and have been told to limit potassium (a mineral in the blood), unless your kidney team clears large portions
  • Do not use if you form calcium oxalate kidney stones and have been told to keep oxalate low, as large amounts add to the load
  • Do not use if you have broken skin, a burn or an open wound and plan to put raw crushed leek on it
  • Do not use if you are pregnant or breastfeeding and are considering medicinal doses, juices or supplements; leek in normal meals is fine
  • Do not use if you are allergic to leek, onion, garlic or other onion-family plants
  • Do not use if you have been told to follow a low-FODMAP diet (a diet low in certain sugars that cause gas) for IBS (irritable bowel syndrome), unless your dietitian agrees

When should you see a doctor?

See a doctor if a cough lasts more than three weeks, brings up blood, or comes with fever or breathlessness. Get checked if constipation lasts more than two weeks, or if you see blood in your stool or lose weight without trying.

Call your anticoagulant (blood thinner) clinic if you are on warfarin and your diet has changed a lot, or if you bruise easily, bleed from the gums or have nosebleeds that will not stop.

Get emergency help if your lips, tongue or throat swell, you come out in hives, or you struggle to breathe after eating leek.

Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.

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