What is Shi Liu Pi?

Shi Liu Pi is the dried rind, or outer peel, of the pomegranate fruit. It is a single herb used in Traditional Chinese Medicine, not a mixed formula. Its other common name is pomegranate rind.

It is used mainly to firm up long-running diarrhoea and to help push out intestinal worms. Classical texts also use it for rectal prolapse (when part of the bowel slips out of the anus) and for heavy vaginal discharge.

The traditional record is long and wide, but human trial evidence for the rind itself is very thin. A long history of use is not proof that something works, and that point applies to every section below.

How does Shi Liu Pi work?

The rind is strongly astringent. That means it tightens and dries tissue, which is the traditional reason it is given for watery stools.

In lab terms, the peel is packed with tannins. Tannins bind to proteins in the gut lining and may make it less leaky, which could slow down loose stools.

The rind also holds small amounts of natural alkaloids (plant chemicals that act on nerves). In animal work these can paralyse worms, which is the old reason for its use against tapeworm. These are ideas from laboratory and animal studies, not proven effects in people.

What forms does Shi Liu Pi come in?

You will mostly find Shi Liu Pi as dried, cut pieces of rind for making a decoction (a tea simmered for a while). Chinese pharmacies also sell a charred version, Shi Liu Pi Tan, which is seen as more drying.

Other forms include powders, capsules and liquid extracts. Pomegranate juice and seed oil are not the same thing — they come from other parts of the fruit and are not used this way. Peel powder is also made into mouth rinses and skin washes.

Where it comes from:

Pomegranate rind appears in the Ming Yi Bie Lu, a Chinese drug text from about the 5th century, and has stayed in use ever since for loose stools and worms. Ayurvedic, Unani and old European practice used the same peel for the same two problems, which is why its traditional standing is broad.

What does Shi Liu Pi help with?

• Long-running or watery diarrhoea: This is the main traditional use, and the one the herb is best known for. The tannins are drying and binding, which fits the old idea of holding the bowel in. We could not find a published human trial testing pomegranate rind for diarrhoea, so treat this as tradition only.
• Dysentery-type diarrhoea with mucus: Classical texts use the charred rind for stubborn cases that drag on. The same texts warn against using it early, while fever and infection are still active. There is no trial evidence in people for this use.
• Intestinal worms, especially tapeworm: Old practice used large doses of the rind to paralyse and expel tapeworm. Animal and lab work supports the idea, but the doses used were close to the ones that cause poisoning. Modern worm medicines are far safer and better tested, so see a doctor instead.
• Rectal prolapse: Traditional use only, based on the herb's tightening action. This is a medical problem that needs a doctor's assessment, not self-treatment.
• Heavy vaginal discharge: Recorded in classical TCM, sometimes as a wash. There is no human trial evidence, and discharge that changes or smells bad should be checked by a doctor.
• Sore mouth or throat: The peel is used as a gargle in several traditions because it is drying and puckering. Evidence in people is limited to a few small dental studies of pomegranate peel rinses, and results are not strong enough to recommend it.

Which foods are rich in Shi Liu Pi?

1. Pomegranate fruit: the edible seeds hold far smaller amounts of the same tannins, and none of the rind's strength
2. Pomegranate juice: often made with some peel pressed in, which is why it shares the drug interactions

What are the side effects of Shi Liu Pi?

• Nausea or an upset stomach
• Vomiting
• Stomach cramps
• Constipation
• Headache or dizziness
• Blurred sight, after large doses
• Muscle weakness, after large doses
• Less iron taken up from food
• Itchy rash or other signs of allergy

Good to know:

Most side effects are mild and fade when you stop. They come from the tannins, the plant compounds that make the peel taste sharp.

Big doses are the real risk. The rind holds small amounts of alkaloids (plant chemicals that act on nerves). Too much can cause vomiting, blurred sight and weakness.

Never raise the dose to clear worms on your own. Old texts used huge doses for that, and cases of poisoning were known.

How much Shi Liu Pi should you take?

• Recommended daily: TCM practice commonly uses 3 to 10 g of dried rind a day, simmered in water and split into two drinks. No dose has been shown safe and effective in modern human trials. Ask a trained practitioner to set the amount for you. Do not copy the very large doses old texts used for tapeworm. Those doses are the ones linked to poisoning.
• Best time of day: Traditionally taken warm, twice a day, morning and evening. Keep it at least two hours away from any medicine or iron tablet.
• With or without food: Tradition takes it between meals. Tannins can turn the stomach, so take it with a little food if you feel sick.
• Time to effect: If it helps loose stools, you would expect to notice it within a day or two.
• How long to take it: Keep it short — a few days at most, not weeks. If your diarrhoea has not settled within two days, stop and see a doctor.