What is Shi Shang Bai?

Shi Shang Bai is a dried herb used in Chinese medicine. It is given for hot, swollen or infected problems. The old phrase for this use is "clear heat and resolve toxin".

The herb is the whole dried plant of a small fern-like spikemoss. Its botanical name is Selaginella doederleinii.

It is a single herb, not a mixed formula. In China it is best known as an add-on to hospital cancer care. It is not mainly a folk tea.

Most claims for it come from lab dishes, animals and small hospital reports from southern China. Its traditional use is real and goes back a long way. But good human trial evidence is thin.

So nothing here is proof that it treats any disease. Long use and clinical proof are two different things. This page reports both, and keeps them apart.

You can buy it as dried cut herb for decoction (a water brew that is simmered for a long time). In China it is also sold as extract tablets. It is not a food, not a vitamin, and not a stand-in for cancer care, antibiotics or antiviral drugs.

How does Shi Shang Bai work?

No one has shown how Shi Shang Bai works in people. That is the plain answer.

In tradition it is used for "heat toxin". This pattern covers sore throats, hot swellings and infected skin. It names a use pattern, not a body process.

In the lab, extracts slow the growth of some cancer cell lines. They also lower some signs of inflammation (swelling) in test tubes and in mice.

Effects in a dish often do not carry over into the human body. Here they have not been backed up by well-run human trials.

What forms does Shi Shang Bai come in?

Common forms include:

Dried cut whole plant, for decoction. This is the old form. It usually needs long simmering.

Extract tablets or capsules made in China. These are often labelled as a Selaginella doederleinii product.

Granules or strong powders that you stir into hot water.

Part of a multi-herb formula written for you by a trained practitioner.

Quality control is patchy outside regulated pharmacies. Buy only from a supplier that tests for heavy metals and pesticides.

Where it comes from:

Shi Shang Bai has been used in southern China for many years. It is best known in Guangdong and Guangxi. The name means about "cypress on the rock", which tells you where it grows.

It shows up in regional herb records and in provincial medicine standards. It is not in the oldest classic texts. So it counts as a known regional herb, not a nationwide staple.

From the 1970s, Chinese hospitals began to give extracts alongside radiotherapy and chemotherapy. This was mainly for lung cancer and for nasopharyngeal (upper throat) cancer.

What does Shi Shang Bai help with?

• Used alongside standard cancer care: This is the main reason people look it up. It is also where the evidence is weakest. Chinese hospital reports describe it added to radiotherapy or chemotherapy. The cancers were lung cancer and nasopharyngeal (upper throat) cancer. These reports are small, mostly uncontrolled, and not enough to show benefit. It is not a cancer treatment. It must never replace one.
• Sore throat and swollen tonsils: This is a long-standing traditional use. The herb is given as a decoction for hot, painful throats. No human trials of this use have been published. Some sore throats come with high fever, trouble swallowing or trouble breathing. Those need medical care, not herbs.
• Hot, infected skin sores and boils: Tradition uses it as a wash, or taken by mouth, for red, hot, pus-filled skin problems. Lab work shows some action against bacteria in a dish. That has not been tested in people. A spreading skin infection needs antibiotics.
• Hepatitis (liver inflammation): Regional tradition includes it for liver heat patterns. There is no sound human evidence for this use. Long-term herb use in general has been linked to some rises in liver enzymes (proteins measured in blood tests). So go carefully here. Use it only with a doctor watching your liver tests.
• Hot or wet coughs: This is traditional use only. It is usually given inside a multi-herb formula, not on its own. No human trials of this use have been published.

What are the side effects of Shi Shang Bai?

• Nausea or stomach upset
• Loss of appetite
• Dry mouth
• Dizziness
• Loose stools
• Rash or itching, in people allergic to the plant
• Raised liver blood tests, reported with long-term or high-dose herbal use

Good to know:

Most reported problems are mild stomach complaints that settle when you stop. They are described in Chinese hospital reports rather than measured in controlled trials, so the true rate is unknown.

The effect that matters most is on the liver. Stop the herb and get a blood test if you develop yellow skin or eyes, dark urine, pale stools, ongoing nausea or pain under your right ribs.

How much Shi Shang Bai should you take?

• Recommended daily: There is no dose proven safe and effective in people, so what follows is traditional practice, not a recommendation. Traditional texts give roughly 10 to 30 g of the dried herb per day, simmered in water. Some southern Chinese sources use higher amounts under supervision, which is not something to try at home. Chinese extract tablets carry their own label dose. Follow the label, and do not stack a tablet on top of a decoction.
• Best time of day: Traditionally the daily decoction is split into two doses, morning and evening. Timing has no proven effect on how well it works.
• With or without food: Take it with or just after food. It can upset an empty stomach, and food makes nausea less likely.
• Time to effect: Unknown. Traditional practice expects some change in throat or skin complaints within a few days, but this has not been measured in trials.
• How long to take it: Short courses only. Two to four weeks is a reasonable limit before you stop and reassess with a practitioner. If you notice no change, stop. Long, continuous use has not been studied for safety, and liver and kidney function should be checked by blood test if you use it for months.