Qian Cao Gen
Do not self-treat with Qian Cao Gen
Practitioner-prepared only. If you use this herb at all, use it only under a trained practitioner.
Who should avoid Qian Cao Gen?
- Do not use if you are pregnant, trying to get pregnant, or might be pregnant — this herb is traditionally avoided in pregnancy and may act on the womb
- Do not use if you are breastfeeding
- Do not use if you are giving it to a child or teenager
- Do not use if you take a blood thinner (anticoagulant) such as warfarin, heparin, apixaban or rivaroxaban
- Do not use if you take an antiplatelet drug (a medicine that stops blood cells sticking together) such as aspirin or clopidogrel
- Do not use if you have a bleeding disorder such as haemophilia (a condition where the blood does not clot properly)
- Do not use if you have surgery, a dental procedure or a biopsy planned within the next two weeks
- Do not use if you have liver disease or have ever had drug-related liver injury
- Do not use if you have kidney disease
- Do not use if you have had cancer, are being treated for cancer, or want to avoid any DNA-damage risk
- Do not use if you are bleeding now and no doctor has found the cause
- Do not use if you are allergic to madder or to other Rubia plants
- Do not use if you plan to take it for months on end: long or repeated courses carry the cancer concern seen in animals
When should you see a doctor?
Get medical help straight away if you cough up blood, vomit blood, pass black or tarry stools, or have bleeding that will not stop after 15 minutes of pressure.
Go to an emergency department for a severe allergic reaction: swelling of the lips, tongue or throat, a spreading rash, or trouble breathing.
Book a same-week appointment if you see blood in your urine, if your periods suddenly get much heavier, if you bruise without knocking yourself, or if your skin or the whites of your eyes turn yellow.
A red tint to your urine after taking the herb is usually just the dye. If it does not clear within two or three days of stopping, get it checked.
Tell your doctor, pharmacist and surgeon that you are taking this herb. Take the packet with you.
- What it is: Qian Cao Gen is the dried root of Rubia cordifolia, called madder root in English, used in Chinese medicine to slow bleeding and clear bruising.
- Active ingredients: Purpurin, Munjistin, Alizarin, Rubiadin, Lucidin, RA-series peptides
- Side effects: Red urine is common and harmless; bleeding risk and possible DNA damage are the real concerns.
- Pregnancy & breastfeeding: Avoid in pregnancy and while breastfeeding.
Educational information, not medical advice — ask your doctor or midwife.
What is Qian Cao Gen?
Qian Cao Gen is the dried root of the plant Rubia cordifolia. It is a single herb, not a blend. In English it is usually called madder root.
Chinese medicine uses it to "cool the blood" and slow bleeding. Healers gave it for nosebleeds, heavy periods, blood in the urine, and coughing up blood. It is also used for bruises and for pain after a knock or fall.
Good human trials are lacking. The herb has a long and wide history of use, but old use is not proof that it works. It also carries real safety worries, so read the safety part below before you consider it.
How does Qian Cao Gen work?
The honest answer is that no one has shown how it works in people.
The root is full of anthraquinones. These are coloured plant chemicals. They are why madder was once used as a red dye.
In lab dishes, some of them slow the way blood cells clump together. Others seem to shorten bleeding time. The two effects pull in opposite directions.
The root also holds a group of ring-shaped peptides (small chains of protein building blocks). These have been studied in cell and animal cancer work, not in people.
In Chinese medicine the herb is said to cool heat in the blood and move blood that is "stuck". That is how the tradition describes its job. No study has shown that the lab effects above happen in a person taking a normal dose.
What forms does Qian Cao Gen come in?
You will meet it in a few forms:
Dried, sliced root, boiled into a tea (a decoction). This is the classic way.
Charred root, called Qian Cao Tan. The root is toasted black and used mainly when the aim is to slow bleeding.
Granules or powders that dissolve in hot water.
As one part of a multi-herb formula, such as Shi Hui San.
Tinctures and capsules sold online. These are the least controlled, and the labelled species is often wrong.
Where it comes from:
Qian Cao Gen appears in the Shen Nong Ben Cao Jing, a Chinese herbal from roughly the second century. It has stayed in use in China ever since, mainly for bleeding and for bruising.
The same plant is Manjistha in Ayurveda, where it is used for skin and blood complaints. Related madder species were farmed across Europe and Asia for centuries to make red dye for cloth.
What does Qian Cao Gen help with?
- Nosebleeds and minor bleeding: This is the classic Chinese use, often with the charred root. The evidence is tradition and practitioner reports only. No controlled human trial supports it. A nosebleed that will not stop needs a doctor, not a herb.
- Heavy menstrual bleeding: Chinese texts list this as a main use. There are no reliable human trials. Heavy periods can point to fibroids, hormone problems or anaemia (low iron in the blood), so they need a proper check first.
- Blood in the urine: Traditional use is long-standing. Blood in the urine is never something to self-treat. It can mean infection, stones or cancer, and it needs testing.
- Coughing or vomiting blood: Old texts list this use. Modern practice does not support treating it at home. Coughing or vomiting blood is an emergency.
- Bruising and pain after injury: Used in Chinese medicine to move "stuck blood" after a knock or sprain. Evidence in people is missing. Any pain relief you feel may come from the rest of the formula or from time passing.
- Period pain with clots: A common traditional use inside multi-herb formulas. No trial has tested the single herb for this.
- Skin rashes and blotches (Ayurvedic use): As Manjistha, the same root is used in India for skin problems. Human evidence is limited to small, poor-quality reports, mostly of mixed formulas.
What are the side effects of Qian Cao Gen?
- Red, pink or orange urine (harmless dye, fades in a day or two)
- Reddish sweat or tears
- Nausea and stomach upset
- Loose stools or diarrhoea
- Skin rash or itching from allergy
- Easier bruising, or bleeding that lasts longer than usual
- Heavier bleeding when taken with blood thinners
- Possible DNA damage with long or repeated use
Good to know:
Most reported problems are mild. The most common one is not a problem at all: your urine may turn red, pink or orange. That is the plant's dye, and it clears in a day or two.
Stomach upset and loose stools come next. They usually settle once you stop the herb.
Two worries are serious. First, the herb may slow clotting, so you can bruise more easily or bleed for longer. Second, madder chemicals damaged DNA and raised tumour rates in animals.
Because of that second point, European rules removed madder root colouring from food. We treat this herb as high-risk and not suitable for casual or long-term use.
Options to discuss with a clinician
Gentler options exist for easy bruising and light bleeding, and they are worth raising at your next visit. Yarrow and shepherd's purse are two herbs often brought up for heavy periods. Arnica cream, used on unbroken skin, is another one people ask about for bruises.
None of these finds the cause of the problem. Ask a doctor or your clinician before you try any of them. Bleeding that keeps coming back needs a proper check, and your clinician can also weigh these options against your medicines and your health history.
Graded pages for the options named above:
- Shepherd's Purse — evidence grade insufficient, traditional tier T3
Review status
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