Hai Ge Ke
Quick Facts
- What it is: Hai Ge Ke is powdered sea clam shell, a single-herb mineral medicine used in Traditional Chinese Medicine.
- Main uses: Cough with thick yellow phlegm, Heartburn and sour stomach, Lumps and swellings (traditional use only)
- Best for: Sour stomach, on chemistry grounds, Use inside a Chinese herbal formula chosen by a practitioner
- Active ingredients: Calcium carbonate (chalk), Magnesium, Iron, Silicon and strontium in trace amounts, Conchiolin (a shell protein)
- Forms: Raw powder, Calcined (fire-treated) powder, Pieces for boiling, Part of mixed herbal formulas
- Time to effect: Acid relief within about an hour; effects on cough are not proven.
- Side effects: Mostly constipation and bloating; too much calcium is the main real risk.
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What is Hai Ge Ke?
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.
How does Hai Ge Ke work?
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.
What forms does Hai Ge Ke come in?
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.
Where it comes from:
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.
Who should avoid Hai Ge Ke?
- Do not use if you are allergic to shellfish.
- Do not use if you have high blood calcium (hypercalcaemia), which means too much calcium in your blood.
- Do not use if you have kidney disease or a history of kidney stones, unless your doctor says it is safe.
- Do not use if you have hyperparathyroidism (an overactive gland in your neck that raises blood calcium).
- Do not use if you take digoxin (a heart drug) without asking your doctor first.
- Do not take it within two to four hours of any medicine you swallow, especially antibiotics, thyroid tablets, iron or bone drugs.
- Do not use if you are pregnant or breastfeeding, as the safety of shell powder has not been studied in pregnancy.
- Do not give it to children unless a qualified practitioner directs it.
- Never use it in place of treatment for pneumonia, asthma, a stomach ulcer or a lump you have found.
- Do not buy it from a seller who cannot confirm testing for heavy metals such as lead, mercury and cadmium.
When should you see a doctor?
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.
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