Huang Tu Tang

What is Huang Tu Tang?

Huang Tu Tang is an old Chinese herbal formula. The name means Yellow Earth Decoction. It is a single drug (TCM formula), which means it is one set recipe of several herbs cooked together, not one plant.

It was used for slow, ongoing bleeding low in the gut. That shows up as dark or black blood in the stool. It was also used for heavy periods, for blood in the urine, and for easy bruising.

It holds prepared aconite (Fu Zi), which can upset heart rhythm, and licorice, which can raise blood pressure. We found no sound human trials of this formula. Long use in Chinese medicine is not proof that it works, and bleeding needs a doctor, not self-care.

How does Huang Tu Tang work?

No trial has shown how this formula works, or whether it works at all. What follows is how the tradition explains it.

Chinese medicine sees this kind of bleeding as a sign of a cold, weak digestion that cannot hold blood in place. The warm herbs, such as prepared aconite and bai zhu, are said to warm and steady the gut. The cool herbs are added to balance them, so the mix is not too hot.

Cooked yellow earth is the baked clay lining of an old cooking stove. It was thought to settle the stomach and stop the slow loss of blood.

Lab work on the single herbs is early and mixed. Some of it looks at blood clotting or gut lining in cells and animals. None of it shows that the whole formula stops bleeding in people.

What forms does Huang Tu Tang come in?

It is nearly always made as a decoction, which is a strong tea made by boiling the herbs. The aconite is boiled first and for longer, on its own, to cut its risk. This step is one reason the formula is not a home project.

Some makers sell it as granules or a powder you stir into hot water. Pills are less common.

Quality varies a lot between sellers. Products with aconite have been found with too much of the poison in them, and some imported herbal mixes have held lead or other heavy metals.

Where it comes from:

The formula comes from the Jin Gui Yao Lue, written by Zhang Zhongjing in China around 200 CE, in the Han era. It has stayed in use in Chinese medicine ever since, and still appears in modern Chinese formula textbooks. Its classic use is bleeding from the far end of the gut in a person judged to be cold and weak.

What does Huang Tu Tang help with?

• Slow, ongoing bleeding low in the gut (dark blood in the stool): This is the classic use, named in the source text from around 200 CE. We found no sound human trial that tests it against a dummy treatment. Dark or black stool can mean bleeding from a stomach ulcer (a sore in the stomach lining) or from a cancer, so it needs a doctor the same week, not a herbal tea.
• Heavy or long-lasting menstrual bleeding: Chinese practitioners have long used it for this when they judge the person to be cold and tired. There is no trial evidence we can point to. Heavy bleeding has many causes, such as fibroids (growths in the womb) or thyroid problems, and these need testing.
• Blood in the urine: Traditional texts list this use. There is no human trial support. Blood in the urine always needs a doctor, as it can come from an infection, a stone, or a cancer.
• Easy bruising or bleeding gums: The tradition groups these with other signs of blood 'not being held in place'. No human trial has tested the formula for them. New easy bruising can be a sign of a blood or liver problem and should be checked.
• Loose stools with a cold, weak stomach: The warming herbs in the mix aim at this pattern. Evidence is limited to tradition and to lab and animal work on single herbs, not on the formula.

What are the side effects of Huang Tu Tang?

• Nausea or vomiting
• Stomach upset or loose stools
• Tingling or numbness in the mouth, tongue, hands or feet: an early sign of aconite poisoning
• Dizziness or feeling faint
• A slow, fast or uneven heartbeat
• Low potassium (a mineral the heart and muscles need)
• Rising blood pressure
• Swollen ankles or a puffy face from held water
• Muscle weakness or cramps
• Headache
• Rash or itching

Good to know:

Mild stomach upset is the most common complaint. The serious risks come from two herbs.

Prolonged aconite can cause a dangerous heart rhythm, and deaths have been reported after badly prepared or overdosed aconite. Licorice taken for weeks can drop your potassium and push your blood pressure up.

Tingling or numbness around the mouth or in the hands after a dose is a warning sign. Stop at once and get emergency care.

Options to discuss with a clinician

For every problem this formula is reached for, there are routes that have been studied far more thoroughly — and each one begins as a conversation with a doctor, pharmacist or registered herbalist, not as a straight swap.

- **Blood in the urine:** this always warrants investigation. A GP can arrange urine tests and imaging to find the cause — infection, stones, or something needing closer follow-up — before anything is taken for it. - **Easy bruising or bleeding gums:** worth asking a clinician about blood counts, clotting tests and iron or vitamin levels, and a dental check for gum disease. Medicines you already take, including blood thinners, are part of that conversation. - **Heavy or long-lasting periods:** a GP or gynaecologist (specialist in the female reproductive system) can look for fibroids, hormonal causes or low iron. Several well-established prescription and non-hormonal options exist, and which fits depends on what is found. - **Dark blood in the stool or slow bleeding low in the gut:** this needs prompt medical assessment, not self-treatment. Ask for same-week review. - **Loose stools with a cold, weak stomach:** a pharmacist or GP can check for infection, coeliac disease or medication side effects, and discuss dietary and rehydration approaches suited to you.