Educational information, not medical advice — ask your doctor or midwife.
Guipan is the dried belly shell of the Reeves' turtle (Mauremys reevesii). It is also called tortoise plastron. Korean healers grind it to powder or boil it down into a stiff glue.
It is used as a tonic. A tonic is a remedy meant to build up a body that feels worn out. Guipan is given most often for night sweats, hot flushes, weak bones and heavy periods.
Here is the verdict up front. We could find no human trials of Guipan. It has a long, firm place in East Asian medicine, but long use is not proof that a remedy works.
No one has shown how Guipan works in a person. Most of the shell is calcium salts and protein. So a dose may act a bit like a calcium and gelatin supplement, though that idea has not been tested.
In Korean medicine, Guipan is said to feed the yin. Yin is a traditional idea, not a body part. The picture is of a body that has run hot and dry, and the shell is meant to cool and moisten it.
Lab and animal work hints at effects on bone cells and on the immune system (the body's defence system). That work is early. It does not tell you what a dose will do in you.
You will meet Guipan in four main forms. Raw shell comes as cleaned, broken pieces meant for long boiling.
Vinegar-fried shell is the common pharmacy form. The shell is heated, quenched in vinegar and crushed, which makes it easier to break down in water.
The glue form is called gyo. The shell is simmered for a day or more and the liquid is set into hard blocks that melt in hot water.
Powders, pills and granules are also sold. In practice Guipan is nearly always one part of a mixed formula, not a stand-alone product.
Tortoise plastron is an old drug. It appears in the Shennong Bencao Jing, a Chinese herb book from roughly 2000 years ago.
Korean medicine took it up and kept it. It is listed in the Dongui Bogam, the great Korean medical text finished in 1613. Japanese Kampo doctors used it as well.
Today the Reeves' turtle is endangered. Trade is limited by law in many countries. Some makers now use farmed turtles, so check the label and the paperwork before you buy.
See a doctor straight away if you get a spreading rash, swelling of the lips or face, or trouble breathing after a dose. Stop taking it first.
Book an appointment if you get ongoing stomach pain, constipation that will not shift, unusual tiredness, or pins and needles in your hands or feet after weeks of use. These can be signs of too much calcium or of metal build-up.
Do not wait on Guipan for night sweats with weight loss, a fever that lasts more than a week, or bleeding that soaks through pads or comes between periods. Get those checked properly.
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 Guipan 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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