Educational information, not medical advice — ask your doctor or midwife.
Agastache rugosa is a mint-family plant from East Asia. Its leaves smell of anise and mint. In Korea it is eaten as a kitchen herb and called bangah.
In Chinese herbal medicine the dried plant was called tu huo xiang. It was used for upset stomach, poor appetite and summer illness. It is often mixed up with patchouli, which shares the name huo xiang.
Here is the honest verdict. Human trials are almost absent, so no one can say what it does in people. Long traditional use is not proof that it works, and it is not proof that it is safe.
Most people meet it as a food herb or a tea. In that form it is treated much like other culinary mints. The concentrated oil is a different matter, and it is covered in the safety section.
No one has shown how it works in the human body. Almost all of the research sits in test tubes and animals.
In lab tests, extracts slow the growth of some bacteria and fungi. Whether that happens on skin or in the gut is not established.
In cell studies, rosmarinic acid and tilianin appear to quiet some inflammation signals. These are early findings, not proof of a benefit you would feel.
In animal work, the aromatic oil appeared to relax gut muscle. That fits the old use for cramping and nausea. It has not been tested properly in people.
The smell and taste may also play a part. Aromatic herbs can make food more appealing when appetite is low. That is a plain, everyday effect rather than a drug action.
You will meet it in a few forms.
- Fresh or dried leaf, used as a kitchen herb in Korean cooking. - Loose dried herb, brewed as a tea. - An ingredient in multi-herb East Asian formulas, such as huo xiang zheng qi preparations.
- Capsules, tablets or liquid extracts sold as supplements. - Essential oil, sold for scent and for skin products.
The essential oil is the strongest form by far. It is not a food, and it is not meant to be swallowed. Labels on cosmetic oils often say this in small print.
Labelling is a real problem with this herb. Products called huo xiang may contain patchouli instead. Check for the botanical name Agastache rugosa on the pack.
Agastache rugosa has a long record in East Asian medicine. Chinese texts listed it as tu huo xiang, a herb for what was described as dampness in the middle of the body.
Traditional practitioners gave it for nausea, vomiting, a heavy feeling after meals and poor appetite. It was also used in summer illness with a stuffy head and an upset stomach. It rarely stood alone and was usually one herb in a formula.
In Korea the plant followed a food path as much as a medical one. The leaves were added to stews, fish dishes and pancakes. That everyday use continues today.
These records describe what people did, not what was proven. None of this history should be read as advice to treat yourself.
Stop and see a doctor if you get a rash, swelling of the lips or face, or trouble breathing. These can signal an allergic reaction.
See a doctor if nausea or vomiting lasts more than two days, or if you cannot keep fluids down.
Get checked promptly for yellow skin or eyes, dark urine, or pain in the upper right belly. These can point to a liver problem.
Call emergency services if a child swallows the essential oil.
In the United States it is sold as a food herb and as a dietary supplement, with no approval to treat any illness. In the United Kingdom and the European Union it is sold as a food or food supplement, and EU rules limit estragole levels in food products. Nowhere is it licensed as a medicine.
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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