Dong Kui Zi
Quick Facts
- What it is: Dong Kui Zi is the dried seed of the cluster mallow plant, used in Chinese medicine for hard, painful peeing and dry stools.
- Main uses: Painful or difficult peeing, Constipation (hard, dry stools), Low breast milk flow, Fluid build-up
- Best for: Short-term traditional use for dry, hard stools, Use inside a Chinese herb formula from a trained herbalist
- Active ingredients: Mucilage (sticky plant fibre), Fatty oils, Protein, Flavonoids
- Forms: Crushed seed tea (decoction), Powder, Pills, Part of mixed herb formulas
- Time to effect: Stool changes may show in one to two days; other effects are not well studied.
- Side effects: Usually loose stools, cramps and more peeing; fluid loss is the main real risk.
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What is Dong Kui Zi?
Dong Kui Zi is the dried seed of the cluster mallow plant. Its Latin name is Malva verticillata. It is one single herb, not a blend of many.
In Chinese medicine it is used for hard or painful peeing. It is also used for dry, hard stools. Some old texts use it to help breast milk flow.
Here is the short verdict on proof. We found no good human trials of this seed. Long use in a tradition is not the same as proof that it works, so treat its uses as tradition only.
How does Dong Kui Zi work?
No one has shown how this seed works in the body. The ideas below come from lab work and from old texts.
The seed holds a lot of mucilage. Mucilage is a sticky fibre that swells in water. In the gut it may hold water and make stools softer and easier to pass.
Some lab and animal work hints at a mild water-losing effect. That means the body may pass a bit more urine (pee). This has not been tested well in people.
In Chinese terms the seed is sweet and cold. It is said to drain heat and damp down and out of the body.
What forms does Dong Kui Zi come in?
The most common form is a tea. The seeds are crushed, then boiled in water for 20 to 30 minutes.
You may also see it as a plain powder or in pills. Most often a herbalist puts it in a mix with other herbs.
A few products sell it as a liquid extract. These are not made to one set standard, so amounts vary a lot.
Where it comes from:
The seed is named in the Shen Nong Ben Cao Jing, an old Chinese herb book from about 200 CE. So its use goes back close to 2000 years.
It has stayed a standard herb in China since then. It is used much less in the West, and few Western studies exist.
Who should avoid Dong Kui Zi?
- Never use this herb if you are pregnant or think you might be, as Chinese texts warn it can act on the womb
- Do not use it if you are breastfeeding unless your doctor or midwife agrees, because its safety for the baby is unknown
- Do not use it if you have ongoing diarrhoea or loose stools
- Do not use it if you have kidney disease or are on dialysis
- Do not use it if you take lithium (a mood medicine) unless your doctor checks your blood levels
- Do not use it if you take water pills (diuretics) without asking your doctor first
- Do not use it if you have heart failure or take digoxin or another heart-rhythm medicine
- Do not give it to children
- Do not use it if you have a blockage in your bowel, or pain with no bowel movement and no wind
- Do not use it if you are already dehydrated, vomiting, or unable to drink
When should you see a doctor?
See a doctor if peeing burns, if there is blood in your urine, or if you have a fever with back pain. These can mean an infection that needs antibiotics.
Get help the same day if you cannot pee at all, if you have severe belly or back pain, or if you feel faint, very weak or your heart is racing.
Also call your doctor if diarrhoea lasts more than two days, if you cannot keep fluids down, or if your legs, face or belly swell up.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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