Educational information, not medical advice — ask your doctor or midwife.
Track chwiodong with reminders and record whether it helped, in the app.
Chwiodong is the dried leaf and young twig of the harlequin glorybower tree, Clerodendrum trichotomum. In Korean herbal practice it is a single drug, used mainly as a tea-like decoction for aching joints, stiffness, numb limbs and high blood pressure.
The same plant is known in Chinese medicine as chou wu tong and in Japan as kusagi. The tree grows wild across Korea, and its young spring shoots are also parboiled and eaten as a namul (seasoned vegetable side dish).
Here is the honest position on evidence. Chwiodong has a long and well-recorded place in East Asian herbal tradition, but almost all of the modern research is laboratory and animal work. Long traditional use tells you a plant has been trusted; it is not the same thing as proof that it works, and that distinction applies throughout this page.
Nobody has shown clearly how chwiodong works in people. What follows is a description of ideas, not settled fact.
In traditional terms, chwiodong is described as dispelling "wind-damp" — the older language for the aching, stiff, heavy joints that flare in cold or wet weather. It is also classed as a herb that calms the liver and brings down a rising head, which is how older texts describe headache, dizziness and high blood pressure.
In the laboratory, extracts of the leaf reduce inflammatory signals in cells and lower blood pressure in rats. Compounds such as acteoside relax blood vessel walls in test systems. Whether any of this happens at the doses a person drinks in a tea is unknown.
Dried chopped leaf and twig is the standard form, simmered into a decoction (a strong boiled tea). This is how it is used in Korean clinics.
Other forms you may meet:
Granulated or powdered extract, sold in sachets and stirred into hot water.
Capsules or tablets of dried powder, more common in export products than in traditional practice.
Alcohol tinctures, mostly Western herbal products.
Young spring shoots as a food vegetable, parboiled and rinsed before eating.
Product strength varies a great deal between makers, and few products state how much acteoside they contain.
Chwiodong appears in East Asian materia medica from roughly the eighteenth century onward, notably in Chinese supplements to the classical herb literature, and it was taken up in Korean practice for joint pain and dizziness.
In twentieth-century Korea and China it became a common folk and clinic remedy for rheumatic complaints and for high blood pressure, often combined with other herbs rather than used alone. Rural Korean food tradition also uses the young leaves as a seasonal vegetable.
See a doctor if you feel faint, if your vision blurs, or if your heart pounds or races after taking it — these can mean your blood pressure has dropped too low. Stop taking it first.
Get urgent help for a swollen face, lips or tongue, a spreading rash, or trouble breathing.
Also book an appointment if joint pain, headache or dizziness is new, severe or getting worse, if one side of your body goes numb or weak, or if yellowing of your skin or eyes, dark urine or persistent stomach pain begins after you start it.
If you are using chwiodong for blood pressure, keep taking your prescribed medicine and keep measuring your readings.
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.
One email with the summary. We'll also send a short weekly evidence update — unsubscribe any time.
