Educational information, not medical advice — ask your doctor or midwife.
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Yi Tang is malt sugar. It is a thick, sweet syrup made by cooking grain, usually rice or sticky millet, with sprouted barley until the starch turns to sugar. In Chinese medicine it is used as a single herb, not just as a food.
It is given to warm and build up the middle of the body, meaning the stomach and gut. The classic use is cramping belly pain that eases with warmth and with gentle pressure. It is also used for weak digestion, low energy, and a dry, tickly cough.
Here is the honest picture. Yi Tang has a long, well recorded place in Chinese medicine, but almost no modern human trials test it on its own. Long traditional use is not proof that a remedy works, and we say that once here rather than in every section below.
Most of what Yi Tang does is simple. It is mostly sugar, so it gives quick energy and tastes very sweet.
Your gut breaks maltose down into glucose, a simple sugar your body burns for fuel. That also raises blood sugar, which matters if you have diabetes.
In Chinese medicine, sweet and warm herbs are said to build the middle, that is, to support the stomach and gut, and to ease cramping. The sticky syrup coats a dry throat, which may be why it was used for dry coughs. These are traditional ideas, not proven drug actions.
No human study has shown that Yi Tang relaxes gut muscle, heals the gut lining, or calms a cough better than any other sweet syrup.
Soft malt syrup, called jiao yi, is the form used as a herb. It is thick, golden and very sticky.
A hard, dried version is also sold, often shaped into sweets.
In a herb formula it is stirred into the hot strained tea at the end. It is not boiled with the other herbs, because it scorches easily.
Food shops sell the same thing as barley malt syrup or rice malt syrup. That is the same sugar, but it is sold as a food and is not checked as a medicine.
Yi Tang appears in the Shang Han Lun, a Chinese medical text from about 200 CE. It is the lead herb in Xiao Jian Zhong Tang, a famous formula for cramping belly pain in people who tire easily.
Later Chinese herbals kept it in the tonic group, meaning herbs used to build strength after illness. It has stayed in steady use in China for roughly 1,800 years.
See a doctor if your belly pain is severe, sudden, or keeps waking you at night. Get help quickly if you vomit blood, pass black tarry stools, run a fever, or lose weight without trying.
Also see a doctor if a cough lasts more than three weeks, if you cough up blood, or if you become short of breath.
If you have diabetes and your blood sugar readings climb, or you feel very thirsty and are passing urine much more often, stop taking it and contact your diabetes team.
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 Yi Tang 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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