Educational information, not medical advice — ask your doctor or midwife.
Anís is the dried fruit of Pimpinella anisum, a small plant in the carrot family. Most people call the fruit a seed. It tastes sweet, a lot like licorice.
In Latin American homes it is brewed as a tea for gas, bloating and an upset stomach. It also flavours bread, candy and anise liqueurs. You can buy it as whole seed, tea bags, extracts, and a strong essential oil.
Anís is not star anise. Star anise comes from a tree in Asia. One kind of that tree, Japanese star anise, is poisonous, and mislabelled star anise teas have badly harmed babies.
The honest verdict on anís is that human evidence is thin. A few small trials hint at help with hot flashes and constipation, but they are low in quality. Long use in tradition is not proof that it works, and not proof that it is safe.
Almost all of the proposed effects are pinned on the seed's oil, mainly trans-anethole.
In test tubes and in animals, anethole relaxes the muscle of the gut wall. That is the usual reason given for easing cramps and trapped gas. Whether this happens in your gut has not been shown well.
In cell studies, anethole acts weakly like estrogen, a female hormone. Small studies in women report fewer hot flashes after a few weeks. The link between the lab finding and that result is still a guess.
In lab dishes, anise oil slows the growth of some bacteria and fungi. In animal tests it also seems to thin mucus. That is the old reason for putting anise in cough syrup, but it has not been confirmed in people.
Animal work also suggests a mild drop in blood sugar. This has not been checked properly in humans, and it is not a reason to treat diabetes with anise.
Anís is sold in both food and remedy forms.
- Whole seed, loose, for brewing tea - Tea bags, often blended with manzanilla or hierbabuena - Ground seed, used as a spice - Liquid extracts and tinctures - Capsules of powdered seed - Essential oil, very concentrated, for scent and flavour trades - Anise liqueurs such as anisado, and sweet breads and candies
The tea and the spice are the everyday Latin American forms. The essential oil is a different thing altogether and is not a stronger tea. It is not meant to be swallowed at home.
Some products sold as "anise tea" for babies are really star anise. That swap has caused real poisonings, so the label matters.
Anís has been grown around the Mediterranean and the Middle East for thousands of years. Spanish settlers carried it to the Americas.
In Mexico, Colombia, Peru and much of Central America, té de anís became a household drink after meals. Grandmothers brewed it for gas, hiccups, colic and "empacho", a folk term for a heavy, blocked stomach.
Agua de anís was also given to newborns for crying and colic, and to nursing mothers to help milk flow. Modern poison centres advise against the baby use, because of both the herb and the risk of toxic star anise in the packet.
Anís also became part of festival food and drink, from pan de anís to aguardiente. That food role is why most people meet it first as a flavour, not a remedy.
Stop anise and get emergency care now if you notice:
- Trouble breathing, or swelling of the lips, tongue or throat - A seizure, shaking or jerking - In a baby: vomiting, floppiness, jitteriness or an odd high cry after any anise tea
Call your doctor soon if you get a rash, ongoing stomach pain, or belly pain with fever, blood in your stool, or weight loss you cannot explain.
Tell your doctor you are using anise if you take hormone treatment, a blood thinner (anticoagulant), or diabetes medicine.
In the United States, anise seed and its oil are allowed as food and flavouring, and anise is sold as a dietary supplement. It is not approved to treat any disease there.
In the European Union, anise seed tea is registered as a traditional herbal medicine for mild gas and cough, based on long use rather than trial proof. In most of Latin America it is sold freely as a food and household tea.
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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