Educational information, not medical advice — ask your doctor or midwife.
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Hyangyu is the dried above-ground part of Elsholtzia ciliata, a mint-family plant also sold as elsholtzia or Korean mint herb. It is a single herb (not a blend) used in Korean medicine, usually brewed as a warm tea for summer colds with chills, headache, nausea and an upset stomach in hot weather.
Tradition also uses it for indigestion with vomiting or loose stools, and for mild puffiness from fluid build-up. In Korea and Vietnam the fresh leaves are also a kitchen herb, eaten in small food amounts.
Evidence verdict: the traditional record is long and consistent across East Asian medicine, but no human trials have tested Hyangyu directly. Long traditional use shows what people have done with a herb for centuries; it is not proof that the herb works, and this page does not repeat that point in every section.
Honestly, nobody has shown how Hyangyu works in people, because the human studies have not been done.
The plant's aroma comes from a volatile oil (the fragrant oil that gives the leaf its smell). In laboratory dishes this oil slows the growth of some bacteria and viruses, and calms some markers of inflammation (swelling and irritation). Cell and animal results do not reliably carry over to a cup of tea.
In Korean and Chinese tradition the herb is described as warming and aromatic. It is said to "release the exterior" and clear summer damp, meaning it is given to bring on a light sweat and settle the stomach. That is a traditional model, not a tested biological mechanism.
The usual form is the dried, chopped herb, brewed as a decoction (herb simmered in water) or steeped as a tea. This is the form the traditional record is based on.
You may also see it as a powder, in granule or capsule extracts, and inside classical Korean formulas such as Hyangyusan. Fresh leaves are sold as a food herb in Korean and Vietnamese groceries.
A steam-distilled essential oil also exists. It is a concentrated product for scent and external use only, and is far stronger than the tea.
Hyangyu is an old staple of East Asian materia medica. It appears in Chinese sources as xiangru and in Korean practice through the Donguibogam (1613), Korea's best-known medical text.
Its classic home is the summer formula Hyangyusan, given in hot, humid weather for chills, nausea and stomach upset. The same plant is called kinh gioi in Vietnam, where it is mostly eaten as a fresh herb.
See a doctor if a fever goes above 39C (102F), lasts more than three days, or comes with a stiff neck, confusion or a rash.
Get medical help the same day for vomiting or diarrhoea you cannot keep on top of, signs of dehydration such as very dark urine or dizziness on standing, or swelling that is new, one-sided or comes with breathlessness or chest pain.
Stop the herb and seek advice if you get a spreading rash, facial or throat swelling, trouble breathing, or if your symptoms simply are not improving after about three days.
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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