Educational information, not medical advice — ask your doctor or midwife.
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Jachung is a dried insect used as a medicine in Korea. It is a single drug, not a blend. The Latin name is Eupolyphaga sinensis, and it is also known as ground beetle.
The whole female insect is dried and then ground. Healers use it for pain from old bruises and blows. It is also used for slow-healing broken bones and for periods that stop or hurt.
In Korean medicine, jachung is said to break up "stuck blood". There are almost no human trials on jachung by itself. Long use in old texts is not proof that a remedy works, and that point holds for this whole page.
The short answer: no one has shown how jachung works in people.
Lab tests show that extracts can slow the making of blood clots. Some tests point to enzymes that break clots down again. This may be why old texts pair it with bruises and hard lumps.
Work in cells and in mice hints at less swelling and some effect on scar tissue in the liver. None of that has been tested well in people. Treat it as an idea, not a fact.
That same clot effect is the main reason for care. If jachung does thin the blood even a little, it can add to the effect of blood thinners.
Jachung comes as a whole dried insect, as coarse crumbs, or as a fine powder. Dried pieces are boiled into a decoction, which is a strong tea made from herbs. Powder is taken by the spoon or packed into capsules.
It is far more often one part of a mixed formula than a lone remedy. Korean pharmacies also stock it in ready-made pills and granules. Buy it only from a licensed pharmacy or a trained herbal clinic.
Jachung goes back about two thousand years in East Asian medicine. It appears in the old Chinese drug classic Shennong Bencao Jing. Korean doctors took it up and listed it in the Donguibogam of 1613.
Its job in those books was always the same: to move blood that is stuck. It was given after falls, blows and broken bones. Those same old texts warned against giving it to pregnant women.
Stop taking jachung and get medical help the same day if you bruise easily for no reason, bleed from your nose or gums, see blood in your stool or urine, or a cut will not stop bleeding.
Call emergency services now if your lips, face or throat swell, if you come out in hives, or if you find it hard to breathe. That can be a severe allergic reaction.
See your doctor before you start if you are on any regular medicine. See a doctor rather than taking jachung if you have a new lump, a period that has stopped, or a broken bone that is not healing.
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 jachung 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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