hyeoryeotan
Quick Facts
- What it is: Hyeoryeotan is charred human hair, used in traditional Korean medicine to slow bleeding.
- Main uses: Nosebleed, Heavy menstrual bleeding, Blood in the urine or stool, Bleeding from minor cuts
- Best for: Traditional formulas prescribed by a licensed Korean medicine practitioner
- Active ingredients: Carbon, Mineral ash including calcium, potassium and iron, Keratin breakdown fragments, Possible heavy-metal traces such as lead and mercury
- Forms: Loose black powder, Capsules, Pills and granules, Added to a herbal decoction, Dusted on the skin in traditional practice
- Time to effect: Never measured in people; tradition expected one to two days for minor bleeding.
- Side effects: Black stools, constipation and nausea are the usual complaints; the bigger worries are masked bleeding and unknown purity.
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What is hyeoryeotan?
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.
How does hyeoryeotan work?
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.
What forms does hyeoryeotan come in?
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.
Where it comes from:
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.
If this is an emergency
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.
Who should avoid hyeoryeotan?
- Do not use if you are bleeding heavily, bleeding will not stop, or you are vomiting blood — call emergency services instead.
- Do not use if you take warfarin, apixaban, rivaroxaban or any other blood thinner (anticoagulant), unless your doctor says otherwise.
- Do not use if you are pregnant or breastfeeding, as there is no safety information for either.
- Do not use if you are giving it to a child, as no dose has ever been established for children.
- Do not use if you have a bleeding disorder such as haemophilia (an inherited condition where blood does not clot properly).
- Do not use if you have kidney or liver disease, as you cannot check the product for heavy metals it may contain.
- Do not use if you are being treated for lead, mercury or other heavy-metal exposure.
- Do not use if you cannot confirm where the hair came from or how it was processed.
- Do not use if you are putting it on broken skin, a deep wound, a burn or a surgical wound.
- Do not use if you take a medicine where a small drop in absorption matters, such as thyroid tablets, epilepsy drugs, transplant medicines or the contraceptive pill.
When should you see a doctor?
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.
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