What is jachung?

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.

How does jachung work?

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.

What forms does jachung come in?

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.

Where it comes from:

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.

What does jachung help with?

• Bruises and pain after a fall or blow: This is the oldest and most common use. Korean and Chinese texts give jachung for a sore, stiff spot left by an injury weeks or months back. There are no human trials that test jachung alone for bruising. Lab work on clot-breaking gives a possible reason, but that is all it is.
• Slow-healing broken bones: Old formulas add jachung when a break is knitting slowly. It is almost never used on its own for this. We found no human trial on jachung and bone healing. If a break is not healing, that is a job for an X-ray and a doctor, not a herb.
• Periods that stop, or period pain: Texts use jachung when periods stop and the cause is judged to be stuck blood. It is a strong, blood-moving drug in that system. No trial backs this up. Periods that stop can point to pregnancy, thyroid trouble or other health problems, so get checked first.
• Hard lumps felt in the belly (a traditional use only): Classic books list jachung for firm masses in the belly. That wording covers many modern problems, some of them serious. Never treat a new lump with a herb. Any lump you can feel needs a doctor's exam and scans.
• Liver scarring, as one part of a mixed formula: Jachung sits inside some East Asian mixed products aimed at liver scarring. Cell and animal studies on the plain drug show some effect on scar tissue. Any human data belongs to the whole product, not to jachung. You cannot read across from a multi-herb pill to a single drug.

Which foods are rich in jachung?

1. No everyday food contains it: jachung is a dried insect sold as a medicine, not as a food

Practical Tips:

You cannot get jachung from your diet, and there is no food form of it.

What are the side effects of jachung?

• Upset stomach or a sick feeling
• Loose stools
• Skin rash or itching
• Bruising more easily than normal
• Small cuts that bleed for longer
• Rare severe allergy, with swelling of the face or throat and trouble breathing

Good to know:

Most reports are mild and settle when you stop. The stomach effects are the ones people notice most.

Two effects matter more. Jachung is insect protein, so people with insect, shellfish or dust mite allergy can react badly. Bleeding and bruising are the other worry, because lab work shows an effect on clotting.

Good safety data is missing. There is no long-term study that counts side effects in people.

How much jachung should you take?

• Recommended daily: No trial has set a safe or useful dose for jachung. The amounts below come from pharmacy custom, not from proof. Korean and Chinese drug books list 3 to 9 g of the dried insect a day, boiled into a tea. As a plain powder, the usual figure is 1 to 1.5 g a day, split into two doses. Use it only under a trained Korean medicine practitioner. Do not raise the amount on your own.
• Best time of day: Usually split into two doses, one in the morning and one in the evening. Keep to the same times each day.
• With or without food: Take it with food or just after a meal. That lowers the chance of feeling sick or getting an upset stomach.
• Time to effect: Not known. Old texts suggest days to a few weeks for bruise pain, but no trial has measured this.
• How long to take it: Custom is a short course of two to four weeks. Stop and think again if nothing has changed by then. Long daily use has not been studied. Do not keep taking it for months without a check-up.