Educational information, not medical advice — ask your doctor or midwife.
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Banjiryeon is a dried herb used in Korean medicine. It is the whole plant of Scutellaria barbata, also called barbat skullcap. Healers boil it in water to make a bitter tea.
In old texts it is used to "clear heat and toxin". In plain words, that means sore throats, boils, bites and swellings. Some people today also take it while they are having cancer care.
Human trial proof is thin. Long use in tradition is not proof that a herb works. Ask your doctor before you take it, above all if you are being treated for cancer or liver trouble.
The short answer is that no one knows for sure.
In the lab, the plant holds flavonoids (natural plant pigments). In a dish, these slow the growth of some cancer cells and calm swelling. Some animal work points the same way.
This is early work. What happens in a dish or a mouse often does not happen in a person. No study has shown how the herb acts in the human body.
Korean and Chinese practice explains it a different way. The herb is said to drain "heat and toxin" and to move fluid, and it was thought to make you pass more urine. That is a traditional idea, not a measured effect.
Most people meet it as loose dried herb. It is boiled to make a decoction, which is a strong tea made by simmering the plant in water. This is the usual form in Korean and Chinese practice.
You can also find granules that dissolve in hot water, capsules, tablets and alcohol tinctures. A water extract called BZL101 has been used in research only. It is not sold as a supplement.
Banjiryeon is the Korean name for the herb known in China as Ban Zhi Lian. It appears in classical East Asian herbal texts and became a steady part of Korean herbal practice.
It was mainly used for hot, painful swellings: abscesses, sore throats, snake and insect bites. Practitioners often paired it with other "heat clearing" herbs rather than using it alone.
Stop taking it and see a doctor the same day if your skin or the whites of your eyes turn yellow, your urine goes dark, your stools turn pale, or you get pain under your right ribs. These can be signs of liver trouble.
Also get checked if you bruise easily, bleed from your gums or nose, or notice blood in your urine or stools.
Go to hospital or call emergency services if you have swelling of the face, lips or tongue, a spreading rash, or trouble breathing.
See your doctor before starting if you take any prescription medicine, and tell your cancer team if you are in treatment.
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 Banjiryeon 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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