Chuan Lian Zi

What is Chuan Lian Zi?

Chuan Lian Zi is the dried ripe fruit of a tree called Melia toosendan. The tree is also known as the Sichuan chinaberry.

In Chinese medicine, trained herbalists use it in small doses for short spells. It is used for pain in the sides, chest and lower belly. In the past it was also used for worms in the gut.

It is one herb, not a formula. Even so, it is nearly always mixed with other herbs. Other names for it are Sichuan chinaberry fruit and toosendan fruit.

The fruit is toxic in more than small doses. It is not a herb for self care.

On the proof: the record of old use is long. But we could not find any published human trials of it. Old use, however old, is not proof that a herb works.

Please read the safety section before anything else here.

How does Chuan Lian Zi work?

In Chinese medicine, Chuan Lian Zi is said to be bitter and cold. It is said to "move liver qi" (ease stuck energy) and to clear heat. That is an old idea, not a finding from biology.

Lab work points to toosendanin as the key compound in the fruit. It is the main active part and the main toxin.

In animal and cell studies, it paralyses worms that live in the gut. It also blocks signals from nerve to muscle. No one has shown that this happens in people at the doses they take.

The same compound may explain the old uses. It is also the one that harms the liver. That is why the gap between a normal dose and a harmful dose is narrow.

What forms does Chuan Lian Zi come in?

The usual form is the dried fruit, whole or broken. It is simmered into a decoction, a water extract made by boiling. Some prescriptions use dry-fried or vinegar-treated fruit.

It also shows up as a small part of ready-made Chinese patent formulas. These are often pills or granules. Powdered herb and tinctures exist, but they are less common.

You should not buy or brew this herb yourself. The kernel and the unripe fruit are more toxic than the prepared pulp. Home brewing has caused poisoning.

Where it comes from:

Chuan Lian Zi shows up in Chinese herb texts by the Tang dynasty. Later classics list it too, such as the Ben Cao Gang Mu. It became a standard herb for liver-qi pain and for worms.

Its toxic side was noted early as well. Old texts warned against large or long doses. Modern official Chinese drug books keep that warning.

What does Chuan Lian Zi help with?

• Pain in the sides, chest or ribs: This is the main classical use, usually in the formula Jin Ling Zi San with Yan Hu Suo. Practitioners use it for pain they describe as coming from "stuck liver qi", often with irritability. We found no human trials testing Chuan Lian Zi on its own for this.
• Lower belly and groin pain: Classical texts use it for cramping or dragging pain low in the belly, including hernia-type pain. The evidence here is traditional record and practitioner experience only.
• Period pain: It appears in some traditional formulas for painful periods with a feeling of fullness. There is no trial evidence we could find for this use, and safer options are widely available.
• Intestinal roundworm: Historically the fruit and the tree bark were used to expel roundworm. Laboratory work shows toosendanin can paralyse worms. Modern deworming medicines are far safer and far better tested, and they have replaced this use.
• Head lice and scabies: Preparations were applied to the skin for lice and mites. This is historical practice, not tested treatment, and broken skin raises the risk of absorbing the toxin.

What are the side effects of Chuan Lian Zi?

• Nausea, vomiting and belly pain
• Diarrhoea
• Dizziness and headache
• Drowsiness or feeling unusually weak
• Liver injury, which can show as yellow skin or eyes, dark urine and pale stools
• Slow or irregular heartbeat in poisoning
• Breathing difficulty and muscle weakness in serious poisoning
• Seizures (fits) in serious poisoning

Good to know:

Stomach upset is the common problem. The serious ones are rare but real: cases of liver damage, heart-rhythm changes, breathing failure and death have been reported after overdose, home preparation or long use.

Children have been poisoned by eating the raw fruit off the tree. Treat any yellowing of the skin or eyes, fainting, fits or trouble breathing as an emergency.