Educational information, not medical advice — ask your doctor or midwife.
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Hyeoryeotan is human hair that has been washed and then charred until it becomes a black, crumbly carbon. It is a single drug in Korean medicine, recorded under the Latin name Homo sapiens and also known as carbonised human hair. Its traditional job was to slow or stop bleeding.
Traditional practitioners gave it for nosebleeds, blood in the urine, very heavy periods, blood in the stool and oozing from small wounds. It almost always appeared as a small part of a larger formula rather than as a remedy on its own.
The honest evidence verdict is that we could find no human trials of it at all. Long traditional use is not proof that a substance works, and that point is made once here rather than repeated in each section below.
Nobody has shown how hyeoryeotan works in people, and the explanations below are ideas rather than proven facts.
Classical Korean and Chinese texts describe it as a drug that "stops bleeding and moves stasis" — meaning it was thought to stem blood loss without leaving clots behind. That is a traditional description, not a measurement of anything in the body.
A modern guess is that charred hair behaves a bit like charcoal or a dry powder dressing. On a raw surface it may soak up fluid and give platelets (the tiny blood cells that plug leaks) something to stick to. Laboratory and animal reports have suggested shorter clotting times, but that work has not been repeated in people.
The usual form is a fine black powder. It is sold loose, packed into capsules, or pressed into pills and granules alongside other herbs.
In decoctions (herbs simmered in water) the powder is added to the finished liquid rather than boiled, because carbon does not dissolve. Some practitioners wrap it in cloth so it does not turn the whole brew gritty.
It is also dusted directly onto small cuts and nosebleeds in traditional practice. Modern wound care does not use it, and a clean dressing is the safer choice.
Carbonised human hair has a long paper trail in East Asian medicine. It appears in the Chinese Bencao tradition, in Japanese Kampo lists, and in Korea it is recorded in the Donguibogam, the royal medical compendium completed in 1613.
In all of these it sits in the same category: a minor bleeding-control drug, added to formulas rather than starring in them. Hair was collected from barbers or from family members, washed, then charred in a sealed pot.
Its standing is genuinely old and genuinely cross-tradition. That says nothing about whether it works.
Some reactions to hyeoryeotan need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Get emergency help now if bleeding will not stop after ten minutes of firm pressure, if you vomit blood or something that looks like coffee grounds, if you pass black tarry stools while not taking this remedy, or if you feel faint, cold, clammy or short of breath.
Make a same-week doctor's appointment for any blood in your urine, any blood in your stool, periods that soak through a pad every hour, or nosebleeds that keep coming back.
Stop taking hyeoryeotan and speak to a pharmacist if you notice a rash, stomach pain, or that a regular medicine seems to have stopped working as well.
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 hyeoryeotan 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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