Educational information, not medical advice — ask your doctor or midwife.
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Orégano here means Mexican oregano, the leaf of the shrub Lippia graveolens. It grows wild in Mexico, Guatemala and the southern United States. Despite the shared name, it is not the same plant as Mediterranean oregano.
It belongs to the verbena family. The dried leaf is a kitchen spice in much of Mexico and Central America. Folk healers also brewed it as tea and used its steam.
Here is the honest verdict. Human trials on this plant are almost absent. Its long use in tradition is not proof that it works, and not proof that it is safe.
Most of what is known about orégano comes from the lab, not from people. Its oil is rich in carvacrol and thymol. In test tubes, these slow the growth of many bacteria and fungi.
In animal studies, leaf extracts have eased gut cramping and lowered signs of swelling. Antioxidant action shows up in test tube work. Whether any of this happens in your body is not established.
A cup of leaf tea holds only a trace of the oil. So results from strong oil do not carry over to tea. Treat these findings as a possible explanation, not a proven one.
Dried leaf is the most common form. It is sold as a spice in most Latin American markets. The same leaf is brewed into tea.
You will also see tinctures, which are alcohol extracts, and capsules of dried leaf or extract. Some cough syrups and herbal honeys include it.
The essential oil is a separate and far stronger product. It is sold neat or pre-diluted in a carrier oil. Most products labelled 'oil of oregano' are made from Mediterranean oregano, so read the botanical name.
Dried leaf is also sold in blends with other herbs for tea. Loose leaf and tea bags are both common.
Healers across Mexico and Central America used orégano for hundreds of years. Colonial-era herbal records list it for coughs and stomach trouble.
Teas were drunk for colds, gas and cramps. Steam from the boiled leaf was breathed in for a blocked nose. In some regions, midwives gave it after childbirth.
It had a second job as a seasoning and a food preservative. That double role kept it in daily kitchen use, which is partly why it stayed so well known.
Call emergency services or poison control at once if someone has swallowed the essential oil neat. Warning signs are burning in the mouth or throat, vomiting, belly pain, confusion or drowsiness.
Get urgent help for a rash with swelling of the lips, face or tongue, or any trouble breathing. That can be a serious allergic reaction.
See a doctor if a cough lasts more than three weeks, or comes with fever, blood or shortness of breath. Also see a doctor for diarrhoea lasting more than two days, or any diarrhoea with blood. Do not keep treating these at home.
In the United States, Mexican oregano is sold as an ordinary spice and as a dietary supplement. Its use as a flavouring is recognised as safe by the FDA. It is not approved as a medicine in the US, the EU or the UK, and no health claim is authorised for it.
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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