Educational information, not medical advice — ask your doctor or midwife.
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Zhi Ke is the dried fruit of the bitter orange tree. It is picked when the fruit is close to ripe, then sliced and dried. It is a single drug (TCM herb), also known as mature bitter orange.
In Chinese herbal medicine it is used for a full, tight, bloated belly. People take it for gas, burping, and a stuffed feeling in the chest or gut. It is nearly always boiled with other herbs, not taken alone.
It is a long-standing staple of Chinese herbal medicine. But human trial proof for the herb on its own is very thin. A long history of use is not proof that a herb works, and that gap applies to everything on this page.
No one has shown how Zhi Ke works in people. The ideas below come from lab dishes, animals, and old texts.
The peel holds synephrine, a mild stimulant. In lab and animal tests it changes how the muscle of the gut squeezes. That may fit the old use for a full, bloated belly.
The same stimulant can lift heart rate and blood pressure. Bitter orange also blocks CYP3A4 (a protein in the gut wall that breaks down many drugs). That can push some drug levels up, much as grapefruit does.
In Chinese thought, Zhi Ke is said to move stuck qi (the body's flow of energy) downward and ease fullness. That is a traditional idea, not a tested one.
The usual form is dried slices of the whole fruit, boiled into a tea with other herbs. This tea is called a decoction.
You may also see it stir-fried with bran. Chinese practice treats the fried form as gentler on the stomach.
It turns up in ready-made pills, powders and granules of classic herbal mixes. Western shops sell a very different product: strong "bitter orange" or "synephrine" extracts for weight loss and energy. Those are not the same thing as the tea herb, and they carry more risk.
Zhi Ke has been named in Chinese herbal books for about a thousand years. Early texts treated it as one herb with Zhi Shi, the small unripe fruit.
Later writers split the two. Zhi Ke, the riper and larger fruit, was seen as the milder of the pair, and Zhi Shi as the stronger. That split is still used today.
Some reactions to Zhi Ke 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 it and get urgent medical help if you have chest pain, a pounding or skipping heartbeat, fainting, a sudden bad headache, or weakness on one side of the body.
Book a normal doctor's appointment if your bloating or indigestion lasts more than two weeks, or if you lose weight without trying, vomit blood, see black stools, or have trouble swallowing.
Tell your doctor or pharmacist you are taking Zhi Ke before you start any new 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 Zhi Ke 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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