Educational information, not medical advice — ask your doctor or midwife.
Track Cao Dou Kou with reminders and record whether it helped, in the app.
Cao Dou Kou is the dried seed of a ginger-family plant, Alpinia katsumadai. In English it is often called Katsumada's Galangal Seed. It is a single herb, not a formula.
Chinese medicine uses it for a cold, bloated, sluggish stomach. It is given when there is nausea or watery stools. The herb is warm and has a strong smell.
Practitioners give it for fullness after eating, belching, vomiting, poor appetite and loose stools. These signs feel worse with cold food or cold weather. The herb is almost always mixed with others, not taken alone.
Here is the honest verdict on the evidence. Cao Dou Kou has a long, well-recorded place in Chinese herb practice. But no human trials of the herb on its own have been published.
Long use tells you what people have done with a plant for ages. It does not prove that the plant works. Keep that in mind for everything below.
In Chinese medicine, Cao Dou Kou is called warm and acrid (sharp-tasting). It is said to warm the middle burner, the stomach and spleen function group. It is also said to dry damp, a traditional idea of stuck fluid.
Practitioners say it settles the stomach. Food then moves down instead of coming back up. That is a traditional model, not a biological one.
Lab work offers some possible mechanisms. Extracts have slowed gut spasm in animal tissue samples. Some parts of the seed lower signs of inflammation (swelling) in cell studies.
None of this has been shown in people at the doses used in practice. Treat the mechanism as a fair guess, not a proven fact.
Cao Dou Kou is sold and used in a few simple forms:
- Whole or crushed dried seeds, for boiling into a decoction (a water extract). - Powdered seed, stirred into warm water or made into pills. - Granules or strong extracts, usually as part of a multi-herb formula.
In some traditions the raw seed is also lightly dry-fried. This softens its warming action.
It is not often sold as a standard capsule in Western supplement shops. The oil distilled from the seed is not meant to be swallowed.
Cao Dou Kou shows up in Chinese herb texts from about the Song dynasty onward. It is listed in later standard works, including the modern Chinese Pharmacopoeia. For many centuries it has been a steady, if minor, warming and damp-drying herb.
It is closely related to Cao Guo (Amomum tsaoko) and Bai Dou Kou (Amomum kravanh). People sometimes mix these herbs up. They are different herbs with overlapping uses, so check the plant name on any product you buy.
See a doctor if your bloating, nausea or diarrhoea has not improved after about two weeks, or if it keeps coming back.
Get medical help the same day if you have severe or constant stomach pain, a fever with vomiting, signs of dehydration such as very little urine or dizziness on standing, or you cannot keep fluids down.
Go to an emergency department if you vomit blood, pass black tarry stools, or develop a spreading rash, swelling of the face or lips, or trouble breathing after taking it.
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 Cao Dou Kou 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.
One email with the summary. We'll also send a short weekly evidence update — unsubscribe any time.
