What is Shan Ci Gu?

Shan Ci Gu is the dried underground bulb of certain orchids, mainly Cremastra appendiculata and two Pleione species. In traditional Chinese medicine it is used as a single herb, or inside a formula, for hard lumps, swollen glands, boils and snake or insect bites.

The honest verdict on evidence is short. We could not find published human trials of Shan Ci Gu on its own, so what it does in people is unknown. Long traditional use tells you a plant was valued; it is not proof that it works, and that point applies to everything below.

One safety fact matters more than any other. Other plants that contain colchicine, a strong and poisonous drug, have been sold under the same name and have caused serious poisoning. Only buy stock that names the plant species on the label.

How does Shan Ci Gu work?

Nobody has shown how Shan Ci Gu works in the human body, and the traditional idea and the laboratory idea are not the same thing.

In traditional Chinese medicine it is described as cool and slightly toxic. It is said to clear heat, drain poison and soften hard lumps, which is why it was chosen for swollen glands and boils.

In the laboratory, extracts and single compounds from the bulb have slowed the growth of cancer cells in dishes and have slowed new blood vessel growth. Cells in a dish are a long way from a person, and these findings do not show that the herb helps anyone.

What forms does Shan Ci Gu come in?

Shan Ci Gu is nearly always sold as a herb for a practitioner to use, not as a supermarket supplement.

Common forms include dried sliced bulb for decoction (simmering in water), and concentrated granules or powder that dissolve in hot water. Pills and capsules exist inside multi-herb patent formulas.

It is also crushed or ground and applied to the skin as a paste for boils and bites. Some Chinese patent medicines list it as one ingredient among many, so read labels if you already take a formula.

Where it comes from:

Shan Ci Gu has been named in Chinese materia medica texts since roughly the Song dynasty, about a thousand years ago.

It was grouped with the heat-clearing, toxin-draining herbs and used for scrofula (swollen neck glands, often from tuberculosis), boils and bites. It appears in the well-known formula Zi Jin Ding.

It remains listed in the Chinese Pharmacopoeia today, which is why the species question on the label matters so much.

What does Shan Ci Gu help with?

• Swollen neck glands (scrofula): This is the classic traditional use, going back centuries, usually in a formula rather than alone. There are no human trials that test whether it shrinks swollen glands. Swollen glands can signal infection or cancer, so they need a doctor's opinion first.
• Boils, abscesses and infected skin lumps: Traditionally the ground bulb is mixed into a paste and put on the lump. We found no clinical trials of this use. A spreading, hot or painful skin infection can become serious fast and needs medical care, not a poultice.
• Hard lumps and nodules, including goitre: Old texts describe it as a herb that softens hardness. That is a traditional idea, not a measured result. Thyroid and breast lumps need imaging and a proper diagnosis.
• Snake and insect bites: The formula Zi Jin Ding, which contains Shan Ci Gu, was traditionally used on bites and stings. No trial supports this. Snake bite is a medical emergency, and nothing here replaces antivenom or a hospital.
• Cancer support formulas: Some modern Chinese formulas include Shan Ci Gu, and laboratory work on its compounds is what drives that interest. There is no human trial showing it treats, shrinks or slows any cancer. It must never replace cancer treatment, and it can clash with it.

Which foods are rich in Shan Ci Gu?

Shan Ci Gu is a medicinal orchid bulb, not a food, and no food contains it.

What are the side effects of Shan Ci Gu?

• Nausea and vomiting
• Diarrhoea and stomach cramps
• Burning or tingling in the mouth and throat
• Loss of appetite
• Skin rash or itching where the paste is applied
• Severe vomiting, watery diarrhoea and dehydration if a colchicine-containing plant has been sold as Shan Ci Gu
• Low blood counts and kidney damage in colchicine poisoning, which can be fatal

Good to know:

Mild stomach upset is the usual complaint with the genuine herb, and it tends to settle when you stop.

The serious harm on this list comes from the wrong plant, not the right one. Colchicine poisoning starts with burning in the mouth and heavy vomiting and diarrhoea within hours, and it can kill. If that happens after taking this herb, treat it as an emergency.

Because the herb is classed as slightly toxic, it is not meant for long-term daily use.

How much Shan Ci Gu should you take?

• Recommended daily: The Chinese Pharmacopoeia gives 3 to 9 grams of dried bulb per day, simmered in water, and this herb is meant to be used under a trained practitioner. No safe dose has been set by any Western authority, and no dose has been tested in a trial. For skin use, a small amount of the paste is applied to the lump.
• Best time of day: Traditionally taken as a warm decoction once or twice a day, usually split between morning and evening. No time of day has been shown to work better.
• With or without food: Usually taken after food, which may reduce stomach upset. If it makes you feel sick either way, stop taking it.
• Time to effect: No reliable answer exists, because it has not been measured in people. Traditional practice expects skin problems to respond within days, and treats no change after two weeks as a reason to stop.
• How long to take it: Traditional use is short and aimed at a specific problem, usually days to a few weeks, not months of daily use. If nothing has changed after about two weeks, stop and see a doctor.