Educational information, not medical advice — ask your doctor or midwife.
Jongnyeopi is the charred leaf stalk and fibre of the windmill palm, Trachycarpus fortunei. "Charred" means the plant material is heated until it turns black on the outside but is not burnt to ash. In Korean herbal practice it is a single drug, used mainly as a haemostatic (something believed to slow or stop bleeding).
Traditional practitioners have given it for heavy menstrual periods, nosebleeds, blood in the stool or urine, and bleeding that keeps coming back. It is usually one part of a larger formula rather than something taken on its own.
The evidence picture is simple and worth saying up front: this herb has a long record in East Asian medicine, but we could find no published human trials testing it. A long history of use is not the same thing as proof that something works, and that difference applies to everything on this page.
The traditional explanation is that charring the palm fibre makes it "astringent" (drawing tissue together), which is thought to tighten small blood vessels and slow bleeding.
A possible modern explanation is that the fibre is rich in tannins (plant compounds that make your mouth feel dry and pucker). Tannins can make proteins clump on contact, and in a test tube that can speed up how fast blood clots.
This is a reasonable idea, not a proven mechanism. No one has shown that eating or drinking charred palm fibre changes clotting in a living person in a measured way.
You may meet jongnyeopi in these forms:
Charred fibre or stalk pieces, added to a decoction (herbs simmered in water and the liquid drunk).
Charred powder, taken by the spoonful mixed into warm water.
As one ingredient inside a multi-herb Korean or Chinese patent formula, where the label may list it as zonglupi, zonglutan or palm fibre.
It is not sold as a standardised extract, so there is no reliable way to know how much active material a given product holds.
Windmill palm fibre appears in classical East Asian materia medica (reference books listing medicines) under the name zonglupi, and it was carried into Korean practice through the same textual tradition. Korean medical works such as the Dongui Bogam (1613) list charred palm fibre among the bleeding-control herbs.
Its role has stayed narrow and steady for centuries: stop bleeding, especially bleeding that is heavy or keeps returning. It was never a general tonic or an everyday household herb.
Get emergency help now if bleeding is heavy and will not stop, if you vomit blood or bring up material that looks like coffee grounds, if you pass black tarry stools, or if you feel faint, cold, sweaty or very short of breath.
See a doctor within a day or two if you notice blood in your urine or stool, a nosebleed that keeps returning, periods that are much heavier than normal, or bruises appearing without a knock.
Stop the herb and speak to your doctor if you feel unusually tired or breathless, which can mean you are low in the red blood cells that carry oxygen, or if a prescribed medicine seems to have stopped working properly.
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.
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