Educational information, not medical advice — ask your doctor or midwife.
What is cilantro, and what is it used for? Cilantro is the fresh leaf of Coriandrum sativum. The dried seed of the same plant is sold as coriander.
Both are kitchen staples in Latin America, and also in Asia and the Middle East. The name causes confusion. In many Latin American kitchens, "culantro" means a different plant, Eryngium foetidum, with long saw-edged leaves.
This page covers Coriandrum sativum, the plant named above, which tastes similar but is milder. As a food, cilantro is safe for most people and adds flavour and a little vitamin K. As a remedy, the human evidence is thin.
Long and wide traditional use is not proof that it works, and it is not proof that it is safe. Folk use focused on the stomach: gas, bloating, cramps and poor appetite.
Modern sellers add bigger claims, such as blood sugar control and "heavy metal detox". Those claims rest mostly on lab and animal work, not on good trials in people.
How is cilantro thought to work? No one has shown how cilantro acts as a medicine in people. Almost all of the proposed action comes from lab dishes and animals.
In test tubes, coriander seed oil slows some bacteria and fungi. Linalool, the main part of the oil, is the likely reason. Whether this happens in your gut or on your skin is not established.
In animals, coriander seed extract has lowered blood sugar and blood fats. The doses were far larger than a meal. Human results are few, small and weak.
In animal gut tissue, the extract eases muscle spasm. That fits the old use for gas and cramps. It has not been confirmed in good human trials.
Cilantro is often sold as a "detox" that pulls metals from the body. That idea comes from a few animal and cell reports. There is no good human evidence that it removes metals.
The strong soapy taste some people report is not an effect of the herb. It is linked to a common gene variant for smell.
What forms does it come in? Cilantro reaches most people as food, not as a supplement.
Common kitchen forms:
- Fresh leaves and stems, sold in bunches - Dried leaf flakes - Whole seeds, labelled coriander - Ground seed powder
Concentrated forms:
- Capsules of dried leaf or seed powder - Liquid tinctures and leaf extracts - Seed essential oil, used for flavour and scent - Teas made from crushed seed
The essential oil is very strong. It is not the same thing as the herb on your plate. It is meant for flavouring and skin products, not for swallowing.
Many "detox" blends mix cilantro extract with chlorella or other algae. The cilantro content is often not stated. Those blends have not been shown to work in people.
Fresh leaf loses its smell fast once cut. Dried leaf is much weaker than fresh. Seed keeps its flavour longer, especially if you grind it just before use.
Where does its traditional use come from? Coriander is one of the oldest cultivated herbs. Seeds have been found in sites across the Mediterranean and the Near East thousands of years old.
Spanish ships carried the seed to the Americas in the 1500s. It spread fast through Mexico, the Caribbean and the Andes. The leaf became central to salsas, ceviche and sofrito.
In Latin American home medicine, healers brewed the seed or leaf as a tea. It was given for gas, bloating, colic in children and poor appetite. Some traditions also used it as a calming drink at night.
Other systems used the same plant. Ayurvedic and Unani texts list coriander seed for digestion and for cooling the body. European herbals listed it as a carminative, meaning a gas-easing herb.
These records tell you what people did. They were not trials, and they did not track harm in any careful way.
When should you see a doctor? Stop and get emergency help if your lips, tongue or throat swell, or if you struggle to breathe. That can be a severe allergic reaction.
See a doctor soon if you get hives, a spreading rash, or a burn-like rash after the oil touched your skin.
If you take diabetes medicine, check your blood sugar and call your doctor if you feel shaky, sweaty or confused.
Also see a doctor if stomach pain, bloating or a poor appetite lasts more than two weeks. Herbs should not delay a proper check.
In the United States, the European Union and the United Kingdom, cilantro is an ordinary food. Its oil is approved as a flavouring. Capsules and extracts are sold as food supplements, not as medicines, so they are not tested for medical claims before sale.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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