Educational information, not medical advice — ask your doctor or midwife.
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Samreung is a single herb used in Korean medicine. It is the dried rhizome (the thick root-like stem) of a marsh plant, Sparganium stoloniferum. In English it is often called bur-reed rhizome.
Herbalists give it for hard lumps or swellings in the belly, for period pain, and for a stuck, full feeling after meals. It is almost never used alone. It is nearly always cooked with other herbs, most often with a partner herb called bongchul (Curcuma zedoaria).
Here is the short verdict. Samreung has a long, steady record in East Asian herbal practice, but almost no human trial data. Long use in a tradition is not proof that a herb works, and that point applies to everything on this page.
No one has shown how samreung works in the body. Korean and Chinese texts say it moves stuck blood and breaks up hard masses. That is a traditional idea, not a measured effect.
Lab and animal work hints that it may slow blood clotting a little and ease swelling. This work is early. It does not tell us what happens in people.
Because of that possible clotting effect, the main safety worry with samreung is bleeding, not the belly complaints it is given for.
You will almost always meet samreung inside a mixed herb formula, not on its own. Common forms are dried sliced rhizome for boiling into a tea (a decoction), granules made from that tea, and pills or powders.
Some sellers offer it processed with vinegar. In tradition, this is said to make it gentler on the stomach. There is no trial data comparing the two.
Samreung comes from the classical East Asian herbal record and is used in Korean, Chinese and Japanese practice. It appears in medical texts from about the 8th to 11th centuries and has stayed in use ever since. In Korea it is a standard pharmacy herb, paired with bongchul in formulas for belly masses and stuck periods.
Some reactions to samreung need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Stop taking samreung and see a doctor if you bruise easily, get nosebleeds, or bleed longer than normal from small cuts. Also see a doctor if your periods get much heavier, or if belly pain, a lump or bloating gets worse or does not settle.
Get emergency help straight away if you vomit blood, pass black tarry stools, or bleed heavily and cannot stop it.
Always have a belly lump, a missed period or ongoing bloating checked by a doctor before you treat it with herbs.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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