What is Xian He Cao?

Xian He Cao is the dried above-ground part of Agrimonia pilosa, a small flowering plant in the rose family. In Traditional Chinese Medicine it is a single herb, used mainly to slow or stop minor bleeding, to firm up loose stools, and as a mild tonic for tiredness.

What does the evidence say? Human trial evidence is thin. Almost all of the research is laboratory and animal work, so we cannot say it treats any condition in people.

Tradition and proof are two different things. A long record of use in Chinese medicine tells you that generations of practitioners valued this herb; it does not tell you that it works, and this is the only place in this document we will say so.

You will most often meet it as a dried herb for decoction (a strong simmered tea), inside a multi-herb Chinese formula, or as a tincture or capsule sold in the West.

How does Xian He Cao work?

The honest answer is that nobody has shown how it works in people.

Lab studies point to tannins, which are astringent plant compounds that make tissue contract and can tighten the surface of the gut and small broken blood vessels. That is the usual explanation offered for its traditional use in bleeding and diarrhoea.

Animal and test-tube work also reports shorter blood-clotting times, lower blood sugar and some antibacterial activity. None of this has been confirmed in human trials, so treat it as a hypothesis rather than a fact.

What forms does Xian He Cao come in?

Common forms:

Dried cut herb, simmered into a decoction (a strong tea made by boiling the herb).

Granules or powdered extract that dissolve in hot water.

One ingredient inside a larger prescribed Chinese formula.

Tincture (an alcohol extract) or capsules, mostly in Western herbal shops.

Occasionally a wash or compress applied to the skin.

Where it comes from:

Xian He Cao means "immortal crane herb", from a Chinese folk story about a crane bringing the plant to exhausted travellers. It is also called Long Ya Cao.

It appears in Chinese herbal literature from the Ming and Qing periods onward and remains a standard hemostatic (bleeding-slowing) herb in modern Chinese practice.

Related Agrimonia species have a separate history in European folk medicine for sore throats and diarrhoea, but that is a different tradition using a different plant.

What does Xian He Cao help with?

• Minor bleeding, such as nosebleed or blood in the stool: This is the herb's classic role in Chinese medicine and the reason it is prescribed most often. The support is traditional, plus lab work on its tannins and animal studies reporting faster clotting. No good human trial confirms it. Bleeding always needs a cause. Any bleeding you cannot explain, or that keeps coming back, is a reason to see a doctor rather than to self-treat.
• Loose stools and long-running diarrhoea: Traditional practice uses the astringent (tissue-tightening) action of the tannins to firm up stools. Evidence in people is missing. Test-tube studies show some activity against gut bacteria, which is not the same as helping a person with diarrhoea. Diarrhoea lasting more than a few days, or with fever, blood or signs of dehydration (dry mouth, little urine, dizziness), needs medical care.
• Heavy menstrual bleeding: Chinese practitioners have long included it in formulas for heavy or prolonged periods. There are no published human trials for this use that we could identify. The traditional standing is real; the proof is not there. Heavy periods can come from fibroids, hormone problems or low iron, so get a diagnosis first.
• Tiredness and weakness during recovery from illness: Its folk name links it to restoring strength, and it is used as a gentle tonic after illness or blood loss. This is tradition only. No human study supports an energy or recovery effect. Ongoing tiredness deserves a check-up, because anaemia (too few red blood cells) and thyroid problems are common and treatable.
• Tapeworm: Agrimophol, a compound isolated from the plant, was studied and used in China as a treatment for tapeworm in the twentieth century. That work involved a purified compound at pharmaceutical doses, not the herb you buy as tea. We could not identify accessible published trial reports in the modern literature. Do not try to treat a parasite yourself. Modern prescription medicines for worms are effective, cheap and monitored.

Which foods are rich in Xian He Cao?

This is a medicinal herb, not a food. It is not eaten as part of any normal diet.

What are the side effects of Xian He Cao?

• Nausea or stomach discomfort, most likely on an empty stomach
• Constipation, from the tightening effect of the tannins
• Dry or puckering feeling in the mouth
• Reduced iron absorption from food or supplements with long-term use
• Allergic reaction such as rash or itching, uncommon
• Possible drop in blood sugar, reported in animal studies, unconfirmed in people

Good to know:

Most reported effects are mild and settle when you stop taking it.

The serious concerns are not the herb on its own but its overlap with medicines: blood thinners and diabetes medicines are the two to watch.

Safety in pregnancy, breastfeeding, children, and in people with liver or kidney disease has not been studied. Because of that gap, this document treats it as a caution-level herb rather than a routine one.

How much Xian He Cao should you take?

• Recommended daily: No dose has been established by research, so what follows is traditional practice rather than a proven amount. Chinese texts and pharmacopoeia practice commonly use 6 to 12 grams of the dried herb a day, simmered into a decoction. Practitioners sometimes use more for short periods. For tinctures, powders and capsules, follow the label, because strengths vary widely between products. If you see a Chinese medicine practitioner, follow their dosing instead.
• Best time of day: Traditionally split into two or three doses spread through the day, often morning and evening. No time of day has been shown to work better.
• With or without food: Take it with or just after food. The tannins can feel harsh on an empty stomach and may cause nausea. Keep it several hours apart from iron supplements, because tannins can bind iron and reduce how much you absorb.
• Time to effect: Traditional practice expects an effect on loose stools or minor bleeding within a day or two. This is a traditional expectation, not a tested finding, and no timeline has been confirmed in people.
• How long to take it: Short courses are the norm. Traditional use is generally days to a few weeks, aimed at a specific problem rather than taken indefinitely. Reassess after two weeks. If the bleeding, diarrhoea or tiredness has not settled, stop and get a medical opinion. Long daily use is not well studied, and high-tannin herbs taken for months may reduce how much iron your body absorbs from food.