Educational information, not medical advice — ask your doctor or midwife.
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Shen Qu is a dried cake of fermented wheat flour, bran and fresh herbs. Its Latin name is Massa fermentata. In Chinese medicine it counts as one herb, taken to settle the stomach after a heavy meal.
People use it for a full, bloated belly, belching and low appetite after eating too much. It is most often mixed into a larger formula rather than taken on its own.
Human trial evidence for Shen Qu alone is very thin. Long use in one tradition shows that people have trusted it for centuries. That is not proof that it works, and this page keeps the two things apart.
No one has shown in people how Shen Qu works. The honest answer is that the idea rests on how the cake is made, not on trial results.
Flour, bran and herbs are left to ferment. Yeasts and moulds grow and leave behind enzymes (proteins that break food apart) and B vitamins. One of these is amylase (an enzyme that splits starch into sugar).
In a dish in a lab, such enzymes do speed up the breakdown of starch. Whether enough of them survive stomach acid to help your own digestion has not been tested.
Chinese medicine describes it a different way. Shen Qu is said to move food that has 'stopped' in the middle of the body and to calm the stomach. That is a way of naming symptoms, not a tested mechanism.
The plain form is a hard, brown cake, sold whole or broken into chunks. You boil the pieces in water to make a tea.
Jiao Shen Qu is the same cake stir-fried until the edges char. Tradition treats this roasted version as gentler on a loose bowel.
Granules and powders dissolve in hot water and skip the boiling. Doses on the label are usually concentrated, so follow the packet rather than the raw-herb amount.
Many people meet it inside a ready-made formula instead. Bao He Wan, a pill for over-eating, is the best-known example.
Shen Qu has been used in China for well over a thousand years. It appears in Tang dynasty writing on herbs from around the seventh century, and in later materia medica texts.
The name means 'divine leaven', a nod to the fermenting step. Classical texts also used it to help the body handle formulas that contain minerals and metals.
It is a staple of one tradition rather than a herb shared across many.
Stop and get medical help the same day if your skin or the whites of your eyes turn yellow, your urine turns dark, or you get pain under your right ribs. These can be signs of liver trouble.
Go to an emergency department if your lips or face swell, you come out in hives, or you struggle to breathe. That is an allergic reaction.
Book a doctor's appointment if bloating, appetite loss or bowel changes last more than two weeks, or if you lose weight without trying. Also call your doctor before starting if you take a blood thinner, a thyroid tablet or diabetes medicine.
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 Shen Qu 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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