Educational information, not medical advice — ask your doctor or midwife.
Clinopodium douglasii is a low, creeping mint with a strong minty smell. In the Philippines it is known as yerba buena. The leaves are brewed as a tea, mostly for aches, pains and coughs.
The plant grows wild in the woods of western North America. It was carried to the Philippines long ago and became a common home remedy there. Spanish speakers in the Americas use the same name, yerba buena, for several different mints.
Here is the honest verdict on the evidence. Almost all of the research is in test tubes and animals. Good human trials are missing, so no health claim here is proven.
Traditional use is not proof. Long use tells you that people valued the plant. It does not show that it works, and it does not show that it is safe.
No one has shown how this plant works in people. The ideas below come from lab work on the plant and on its single chemicals.
The leaves hold a minty essential oil. Menthol, one of its parts, triggers cold sensors in skin and gums. That is well established for pure menthol, and it may explain the cooling, slightly numb feeling of the tea.
In test tubes, mint oils of this kind slow the growth of some bacteria and fungi. Whether that happens in a human mouth or gut is not known.
In animal pain tests, extracts of Philippine yerba buena have dulled pain responses. Animal results often fail to repeat in people. Treat this as a lead, not a finding.
You will mostly meet this plant as a leaf, fresh or dried.
- Fresh leaves, chewed or crushed. - Dried leaf tea, loose or in tea bags. - A stronger boiled brew, called a decoction.
- Crushed leaf used as a poultice on the skin. - Liquid extracts and tinctures. - Essential oil, steam distilled from the leaf.
The essential oil is a very different thing from the tea. It is many times stronger, and it is not a drink. Some Philippine products sell dried yerba buena as a tea or capsule.
Yerba buena has a long record of home use on two continents.
Native peoples of the Pacific coast of North America brewed the leaves. The tea was taken for colds, fever and stomach trouble, and used as a wash.
In the Philippines the plant became a standard household remedy. It was taken for headache, toothache, body aches, coughs and gas. The Philippine Department of Health later listed it among its recommended medicinal plants, mainly as a pain remedy.
Those past uses are recorded fact. They are not a test of whether the plant helps.
Stop and see a doctor the same day if you notice yellow skin or eyes, dark urine, pale stools, or pain under the right ribs. Those can mean liver trouble.
Get urgent help if someone swallows the essential oil. Watch for vomiting, belly pain, confusion or drowsiness.
See a doctor if a headache is sudden and severe, if a cough lasts over three weeks, or if a toothache comes with fever and face swelling. Book an appointment if any symptom has not settled in a week.
In the Philippines, yerba buena is promoted by the Department of Health as a traditional medicinal plant, and leaf products are sold openly. In the United States, the United Kingdom and the European Union it is sold as a herbal tea or supplement, not as an approved medicine. The European Union limits pulegone, one of its oil parts, in flavoured food and drink.
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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