Xiang Jia Pi

What is Xiang Jia Pi?

Xiang Jia Pi is the dried root bark of a Chinese vine, Periploca sepium. In English it is called Chinese silk vine root bark. It is one single herb, not a blend.

Chinese medicine uses it for sore, stiff joints, weak legs, and puffy, swollen legs. It is seen as a warming herb that drives out damp and eases pain.

It is not the same plant as Wu Jia Pi. The two names get mixed up all the time. Xiang Jia Pi holds heart-acting compounds, and too much of it can poison you.

There is a long record of use, but that is not proof that it works. We found no human trials of this herb. So the honest answer is that no one has shown what it does in people.

How does Xiang Jia Pi work?

The bark holds cardiac glycosides (plant compounds that act on the heart muscle). This is the one thing about the herb that is well shown in the lab.

In lab and animal tests, these compounds make the heart squeeze harder and beat more slowly. They also make the body pass more urine. Drugs from the same family are used to treat heart failure.

That is also why the herb is risky. The gap between a dose that acts and a dose that harms is small. Poisoning has been reported when people took too much.

Chinese medicine gives a different account. It says the herb warms the body, dries damp, and moves fluid out of swollen legs. Neither account has been tested in a proper human trial.

What forms does Xiang Jia Pi come in?

You will most often see it as dried, shredded bark.

The usual way to take it is as a decoction. That means a herbalist boils the bark in water to make a strong tea. It is nearly always used in a mix with other herbs, not on its own.

It also turns up in some ready-made Chinese pills, plasters and herb-soaked wines sold for joint pain.

Loose bark is sold online. Labels are often wrong, and it is sometimes sold as Wu Jia Pi by mistake. If you cannot be sure what you have, do not take it.

Where it comes from:

Xiang Jia Pi has long been used in northern China, where the vine grows. Country healers used it for aching joints and heavy, swollen legs.

For years it was sold as a cheap stand-in for Wu Jia Pi, a milder and safer bark. Once the heart effects were understood, Chinese drug lists split the two apart. Today it is listed as its own herb, with dose limits attached.

What does Xiang Jia Pi help with?

• Joint pain and stiffness: This is the main traditional use. Herbalists in northern China add it to mixes for cold, damp, aching joints that feel worse in bad weather. We found no human trial testing it for joint pain. Safer herbs are used for the same purpose, so most practitioners reach for those first.
• Weak, aching or heavy legs: Old texts say the herb strengthens the sinews and bones and helps weak legs. This is a traditional claim only. No study in people has tested it, and lab work does not speak to leg strength at all.
• Swollen legs, ankles and feet (fluid build-up): The herb makes animals pass more urine, which fits its traditional use for swelling. But swelling in the legs can be a sign of heart or kidney trouble. Treating that on your own is dangerous, and this herb acts on the heart. See a doctor to find the cause first.

What are the side effects of Xiang Jia Pi?

• Feeling sick or throwing up
• Stomach pain and loss of appetite
• Diarrhoea
• Headache and dizziness
• Feeling very tired or muddled
• A slow, skipping or racing heartbeat
• Blurred sight, or yellow or green halos around lights
• Fainting
• Heart rhythm failure and death after a large overdose

Good to know:

Most of the mild effects, such as nausea and stomach upset, are the body's early warning that the dose is too high. Do not push through them.

The serious effects come from the heart-acting compounds in the bark. They are not common at careful doses, but they are severe when they happen. Poisoning cases have been reported, including deaths after large amounts.

The risk goes up sharply if the bark is mislabelled, if the dose is guessed, or if you also take heart or water pills.