What is Chi Shi Zhi?
Chi Shi Zhi is a soft red clay mineral, known in English as halloysite or red kaolin. In Traditional Chinese Medicine it is used as a binding, drying remedy for long-lasting watery diarrhoea and for chronic bleeding that will not settle.
It is a single mineral drug, not a plant and not a blend. Practitioners class it as an "astringent" — something that tightens tissue and holds fluid in. It is usually crushed to a powder and cooked into a formula with other herbs rather than taken alone.
The honest evidence picture is thin. Chi Shi Zhi has centuries of recorded use in one tradition, but we could find no modern controlled human trials of the mineral itself. Traditional standing is not the same as proof that something works, and that difference applies to everything on this page.
How does Chi Shi Zhi work?
The idea is mechanical rather than chemical. Fine clay particles have a huge surface area, so they can soak up water and bind loose material in the gut, which may firm up stool.
The same binding action is thought to coat irritated gut lining and, when applied to a wound, to help a clot form. This is a reasonable explanation on paper and matches how related clays such as kaolin behave in the laboratory.
It has not been confirmed for Chi Shi Zhi in people. Treat the mechanism as a plausible idea, not a demonstrated fact.
What forms does Chi Shi Zhi come in?
You will most often meet Chi Shi Zhi as a raw crushed mineral or a fine powder. Both are cooked in a water decoction (a strong tea simmered from the raw material) alongside other herbs.
A calcined form also exists, made by roasting the mineral at high heat. Calcining is the standard preparation when the aim is to stop bleeding.
Powdered Chi Shi Zhi is sometimes dusted onto sores or slow-healing wounds. It also appears inside prepared pill and granule formulas, most famously Chi Shi Zhi Yu Yu Liang Tang.
It is not sold as a standardised extract, because a mineral has no extractable active plant compound to standardise.
Where it comes from:
Chi Shi Zhi appears in the Shennong Ben Cao Jing, the foundational Chinese materia medica compiled around the first to second century CE. Zhang Zhongjing used it in the Shang Han Lun for persistent diarrhoea with bleeding.
It has stayed in continuous use in Chinese medicine ever since and is listed in the modern Chinese Pharmacopoeia. Its standing comes from one tradition, deeply, rather than from several traditions independently.
Who should avoid Chi Shi Zhi?
- Do not use if you are pregnant, unless a qualified practitioner is directing your care — traditional practice avoids it in pregnancy.
- Do not use if you are breastfeeding.
- Do not give it to a child.
- Do not use if you have kidney disease or reduced kidney function, because damaged kidneys clear aluminium poorly.
- Do not use if you have a fever, or diarrhoea with severe stomach pain, because binding the bowel can trap an infection inside.
- Do not use if you are constipated or have a blockage in your bowel.
- Do not use if you are taking a tetracycline or quinolone antibiotic, digoxin (a heart medicine) or levothyroxine (thyroid hormone), unless your doctor has approved the timing gap.
- Do not use it at the same time as any medicine taken by mouth — always leave at least two hours.
- Never use it to treat bleeding after childbirth at home; that is a medical emergency.
- Do not use a product that has not been tested for heavy metals such as lead and arsenic.
When should you see a doctor?
See a doctor if diarrhoea lasts more than two days, or sooner if you have a fever, severe stomach pain, or cannot keep fluids down.
Go to hospital straight away for black or tarry stools, a lot of blood in the stool, vomiting blood, heavy bleeding that will not stop, or signs of serious dehydration such as dizziness on standing, a dry mouth and passing very little urine.
Tell your doctor or pharmacist that you are taking Chi Shi Zhi if you take any regular prescription medicine, and speak to them first if you have kidney trouble.
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