Educational information, not medical advice — ask your doctor or midwife.
Pleurotus tuber-regium is an edible mushroom. It makes a hard underground lump called a sclerotium (a food store the fungus grows below the soil). Cooks grate or grind this lump and stir it into soups.
In West Africa it is food first and a home remedy second. The Igbo name for it is usu. People have long taken it for headache, upset stomach, fever, and swollen joints.
Here is the plain verdict. Lab dishes and mice show some promise, but we found no human trials of this mushroom. Long use in the kitchen and the home is not proof that it treats any illness.
No one has shown how it works in people. What follows is a best guess from lab and animal work.
The cell walls of this mushroom are rich in beta-glucans (a kind of fibre found in fungus walls). In test tubes and in mice, these fibres seem to nudge immune cells and to slow the uptake of fat and sugar from food.
The sclerotium is also very high in fibre. Fibre can bulk up stool and can bind some fat in the gut. That much is true of many high-fibre foods, not just this one.
Mouse studies have looked at tumour growth, blood fats and blood sugar. Mice are not people, and a dose that works in a mouse may do nothing in you. Treat every mechanism listed here as untested in humans.
The most common form is food. Dried sclerotium is sold as hard chunks or as a pale flour.
Soups are the usual route. The flour thickens the pot and adds a mild, nutty taste. Fresh caps are cooked like any other oyster mushroom.
Supplement forms also exist. You may see capsules, loose powder, or a water extract sold as a mushroom blend. Labels rarely say how much beta-glucan is inside.
A tea is sometimes made by simmering chopped dried pieces in water. This is a home method, not a tested one.
This mushroom belongs to the warm parts of Africa and Asia. Nigeria and Ghana have the longest food record, and the Igbo name usu is still in daily use.
Market sellers stock the dried sclerotium year round. Families keep it as a store food because it lasts a long time without spoiling.
Folk healers in West Africa gave it for headache, fever, stomach pain and swelling. Some folk use is also recorded in southern China and Southeast Asia. Modern research on it began in the late twentieth century.
Call for emergency help if your lips, tongue or throat swell, or if you struggle to breathe after eating it. See a doctor within a day if you get a spreading rash, bad stomach pain, or vomiting that will not settle. Book a normal appointment if your bowels stay upset for more than a week, or if you have diabetes and your blood sugar readings start swinging.
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 Pleurotus Tuber-regium 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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