Educational information, not medical advice — ask your doctor or midwife.
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Hai Ge Ke is the ground shell of sea clams. It is a single herb, not a blend. In English it is called Clam Shell.
In Chinese medicine it is used for coughs with thick, sticky yellow phlegm. It is also used for sour stomach and heartburn. Old texts list it for lumps in the neck.
Here is the short verdict. It has long, steady use in one tradition. But human trials are missing, and long use is not proof that it works.
Most of the shell is chalk, also called calcium carbonate. Chalk soaks up stomach acid. That is plain chemistry, and it is the clearest thing we can say about it.
Chinese medicine gives it a different job. It is said to clear heat and thin thick phlegm. That idea comes from tradition, and no trial has tested it in people.
Claims about lumps and swellings should be read as untested.
It comes as a grey-white powder made from crushed shell. Some sellers calcine it, which means they heat it in a fire until it turns brittle. The calcined form is used more often for sour stomach.
You will most often meet it inside a mixed herbal formula. A practitioner may also give it as loose powder, or as pieces to boil in water. Single-herb capsules are not common in the West.
Clam shell shows up in Chinese medical texts by about the 5th century CE. It has been in steady use since then.
It is a well-known item in Chinese materia medica (the list of herbs a tradition uses). It is not part of Ayurveda or Western herbal practice. Its standing rests on one tradition.
See a doctor if a cough lasts more than three weeks, or if you cough up blood.
Get medical help the same day if you have chest pain, trouble breathing, a high fever, or you are losing weight without trying.
See a doctor about heartburn that keeps coming back, pain on swallowing, vomiting blood, or black tarry stools.
Also get checked if you feel very thirsty, tired, confused or sick to your stomach while taking it. Those can be signs of too much calcium in the blood.
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 Hai Ge Ke 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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