Educational information, not medical advice — ask your doctor or midwife.
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Kudzu is a climbing vine. Korean medicine uses its thick root, known as galgeun. The root is simmered into a tea or dried and ground.
Today most people take it for one of two reasons. Some hope it will help them cut back on alcohol. Others take it for hot flushes after menopause (when monthly periods stop).
The root has a long record in Korea, China and Japan. Human trial evidence is thin and mixed. Long use in tradition is not proof that a herb works, and this page keeps those two things apart.
No one knows for sure how kudzu works. Its main plant compounds are isoflavones. These are shaped a bit like estrogen, a hormone the body makes.
Because of that shape, they can lock onto the same spots in the body that estrogen uses. This is why kudzu is studied for hot flushes. The effect is much weaker than real hormone medicine.
For drinking, one idea is that kudzu raises blood flow to the brain. A drink may then feel like enough sooner. This is still a guess, not a proven path.
Dried sliced root is the classic Korean form. You simmer it in water to make a tea.
Powdered root is stirred into water or juice. Capsules and tablets of strong extract are the common shop form. Some labels list how much puerarin is inside.
Kudzu root starch is sold as a food, used to thicken noodles and jellies. Dried flower is sold as a hangover tea.
The root is also part of many classic Korean and Chinese herb blends. A trained herbalist mixes it with other herbs there.
Kudzu root shows up in East Asian medical books going back about 2,000 years. Korean doctors list it in the Dongui Bogam, a royal medical text from 1613.
Old texts gave it for fever with a stiff neck and shoulders, for strong thirst, and for rashes that were slow to come out.
It is food as well as medicine in Korea. The starch is still used in noodles and cool summer jellies.
Some reactions to Kudzu Korean need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
See a doctor soon if your skin or the whites of your eyes turn yellow, your urine goes dark, or you feel sick and very tired. These can be signs of liver trouble, so stop taking kudzu first.
See a doctor if you bruise easily, bleed from the nose or gums, or see blood in your stools.
Get urgent help for anyone stopping heavy drinking who shakes badly, sweats, sees things that are not there, or has a fit (seizure). Also speak to a doctor if you want to cut down on alcohol, rather than relying on a herb alone.
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 →
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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