Educational information, not medical advice — ask your doctor or midwife.
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Hyeonggae is a dried herb used in Korean medicine. It is the flower spike of a mint-family plant, Schizonepeta tenuifolia. You may also see it sold as Japanese catnip or schizonepeta spike.
Herb shops sell it as a single herb. It is used at the first sign of a cold. Think chills, a stuffy nose, a sore throat and a headache.
It is also used for itchy skin rashes, such as hives.
Here is the short verdict. No human trials have tested this herb on its own. Long use in a tradition is not proof that a herb works.
The honest answer is that no one knows how it works in people.
Lab and animal work gives a few clues. The oil in the herb may ease swelling and redness. It may also calm the itch signal that histamine sets off.
Histamine is a body chemical that drives hives and itchy skin.
Korean practice has its own view. It says the herb opens the surface of the body and pushes out wind. Wind is the old term for what brings on colds and rashes.
None of this has been shown in a human trial.
Most people take Hyeonggae as a strong tea. The tea is made by boiling the dried, cut flower spikes. Add the herb in the last five minutes, since its oil boils away fast.
It also comes as a powder, as pills and as a liquid extract. A charred form, called hyeonggae-tan, is made by roasting the herb until it turns black. Korean practice uses that charred form for minor bleeding.
Most Korean recipes mix it with other herbs rather than use it alone. A common pairing is with bangpung (Saposhnikovia).
Hyeonggae is the Korean name for a herb used across East Asia. Chinese texts call it jing jie, and Japanese Kampo calls it keigai. Records of its use go back well over a thousand years.
In Korea it appears in the Donguibogam, a medical text from 1613. It sits in the group of herbs meant to clear the first stage of a cold. That role has not changed much since.
See a doctor if your fever goes above 39C (102F), lasts more than three days, or comes back after it settles.
Get care the same day if you are short of breath, have chest pain, a stiff neck, or a rash that spreads quickly. Also see a doctor if a rash blisters or weeps, or if it has not improved in a week.
Call emergency services if your face, lips or tongue swell, or you find it hard to breathe.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Hyeonggae is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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