Ingredient Animal — secretion (动物分泌物 dòng wù fēn mì wù)

Niu Dan

Ox bile · 牛胆

Bos taurus domesticus Gmelin · Fel Bovis

Ox bile is a bitter, cold substance used in Chinese medicine to clear heat and dampness from the liver and gallbladder. It is primarily used for conditions like jaundice, gallstones, red eyes, and constipation, and can also help resolve boils and abscesses.

Category Herbs that clear Heat and dry Dampness (清热燥湿药) Herbs that clear Heat and resolve Toxicity (清热解毒药) Herbs that clear Liver Heat and brighten the eyes (清肝明目药)
Therapeutic focus Liver health Gallbladder support Eye health Digestive health

TCM Properties

Temperature

Cold

Taste

Bitter (苦 kǔ)

Channels entered

Liver, Gallbladder, Lungs

Parts used

Animal — secretion (动物分泌物 dòng wù fēn mì wù)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Ingredient Does

Every ingredient has a specific set of actions — here's what Niu Dan does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Niu Dan is primarily used to support these areas of health:

Liver health Gallbladder support Eye health Digestive health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Niu Dan performs to restore balance in the body:

Clears Heat and drains Fire Clears Liver and brightens the eyes Promotes bile flow and unblocks the intestines Resolves Toxicity and reduces swelling

How these actions work

Clears Heat and drains Fire means Niú Dǎn reduces excess heat in the body, especially in the Liver and Gallbladder. This is why it is used for high fever, irritability, and inflammation. Clears Liver and brightens the eyes refers to its ability to cool Liver Fire that rises to the eyes, treating red, swollen, painful eyes and blurred vision. Promotes bile flow and unblocks the intestines means it stimulates bile secretion and eases bowel movements, making it effective for jaundice, gallstones, and constipation. Resolves Toxicity and reduces swelling describes its action on boils, abscesses, and other toxic-heat skin conditions, both internally and topically.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Niu Dan is used to help correct these specific patterns.

Why Niu Dan addresses this pattern

Niú Dǎn is extremely bitter and cold, entering the Liver and Gallbladder channels. It directly clears Damp-Heat from the Liver, drains Fire, and promotes bile flow, addressing the root of this pattern. Its bitter nature dries Dampness while its cold nature cools Heat, making it effective for jaundice, hypochondriac pain, and bitter taste caused by Liver Damp-Heat.

A practitioner would look for one or more of these signs

Jaundice

yellowing of skin and eyes from damp-heat steaming the liver

Bitter Taste

persistent bitter taste from liver heat rising

Hypochondriac Pain

pain and distention under the ribs

Commonly Used For

These are conditions where Niu Dan is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Damp-Heat in the Liver Damp-Heat in the Gallbladder

TCM Interpretation

Jaundice in TCM is seen as Damp-Heat accumulating in the Liver and Gallbladder, causing bile to overflow into the blood and skin. The yellow color reflects the Damp-Heat steaming upward. This is often triggered by dietary indiscretions, emotional stress, or external pathogenic factors.

Why Niu Dan Helps

Niú Dǎn's intensely bitter and cold nature directly clears Damp-Heat from the Liver and Gallbladder channels. It promotes the smooth flow of bile and drains Fire downward through the bowels, addressing the root cause of the jaundice. Its action is particularly suited for acute, excess-type jaundice with a bright yellow hue.

Also commonly used for

Gallstones

helps dissolve stones and ease biliary colic by clearing damp-heat

Constipation

moistens the intestines and purges heat to relieve dry stool

Boils

resolves toxicity and reduces swelling when applied topically or taken internally

Abscesses

draws out pus and clears heat to heal deep infections

Ingredient Properties

Every ingredient has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Cold

Taste

Bitter (苦 kǔ)

Channels Entered

Liver Gallbladder Lungs

Parts Used

Animal — secretion (动物分泌物 dòng wù fēn mì wù)

Dosage & Preparation

These are general dosage guidelines for Niu Dan — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

0.3–0.9 g (as dried powder or in pills)

Maximum dosage

Do not exceed 1.5 g per day; higher doses may cause gastrointestinal discomfort even in robust individuals and should only be used under experienced supervision.

Dosage notes

Ox bile is rarely used alone; it is most often combined with other herbs in pill or powder form to balance its bitter-cold nature. For acute heat conditions like febrile convulsion or damp-heat jaundice, the higher end of the dosage range may be used for a short duration. Long-term use can impair Spleen-Stomach function.

Processing Methods

In TCM, the same ingredient can be prepared in different ways to change its effects — here's how processing alters what Niu Dan does

Processing method

Fresh gallbladder is collected, the bile is strained through cloth to remove impurities, and then dried at low temperature (below 60°C) to obtain a yellow-brown powder.

How it changes properties

Drying slightly tempers the extreme cold nature and makes the bile easier to store, weigh, and administer. The fundamental bitter-cold character and actions (clearing heat, draining fire, promoting bile flow) are retained.

When to use this form

This is the standard form for internal use; it can be accurately dosed and mixed with other powder ingredients for pill or powder formulas.

Common Ingredient Pairs

These ingredients are traditionally combined with Niu Dan for enhanced therapeutic effect

Long Dan Cao
Long Dan Cao 1:1 (Niú Dǎn powder 1-3g, Long Dan Cao 3-6g)

Together they powerfully clear Liver and Gallbladder Damp-Heat, drain Fire, and promote bile flow. Long Dan Cao strongly dries Dampness, while Niú Dǎn adds the ability to unblock the bowels and purge Heat downward.

When to use: For severe Damp-Heat in the Liver and Gallbladder with jaundice, red eyes, bitter taste, hypochondriac pain, and constipation.

Huang Lian
Huang Lian 1:1

Both are bitter and cold, clearing Heat and drying Dampness. Huang Lian focuses on the Heart and Stomach, while Niú Dǎn targets the Liver and Gallbladder. Together they drain Fire from the entire digestive system and resolve Toxicity.

When to use: For Toxic-Heat with gastrointestinal symptoms such as dysentery, vomiting, and abdominal pain, or for severe skin infections with internal heat.

Yin Chen
Yin Chen Yin Chen 15-30g, Niú Dǎn powder 1-3g (added to decoction)

Yin Chen Hao is the primary herb for clearing Damp-Heat and promoting bile flow for jaundice. Niú Dǎn enhances this action with its stronger Fire-draining and bowel-unblocking properties, making the pair highly effective for acute jaundice.

When to use: For acute infectious hepatitis or cholecystitis with bright yellow jaundice, dark urine, and constipation.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Xi
Niu Dan vs Xiong dan

Both are bitter-cold animal biles that clear Heat and resolve Toxicity. Xiong Dan (bear bile) is stronger and used for high fever, convulsions, and severe pain, but it is expensive and often restricted. Niú Dǎn is milder, more accessible, and better suited for Liver/Gallbladder Damp-Heat and constipation.

Zhu Dan
Niu Dan vs Zhu Dan

Both clear Heat and moisten dryness. Zhu Dan (pig bile) is better for Lung Heat cough and intestinal dryness with constipation. Niú Dǎn is more focused on Liver and Gallbladder heat, with stronger bile-promoting and eye-clearing actions.

Therapeutic Substitutes

Legitimate clinical replacements when Niu Dan is unavailable, restricted, or contraindicated

Zhu Dan

Zhu Dan
Zhu Dan 猪胆
Pig's bile

Covers: Clears Heat, drains Fire, and moistens dryness. Can be used for mild Liver heat, constipation, and some eye disorders, but is less targeted to Liver/Gallbladder Damp-Heat.

Does not cover: Does not have the same strength in clearing Liver and Gallbladder Damp-Heat or promoting bile flow. Less effective for jaundice and cholecystitis.

Use when: When Niú Dǎn is unavailable and the primary need is general heat-clearing with constipation or mild eye redness.

Identity & Adulterants

Related species and common adulterations to be aware of when sourcing Niu Dan

Ox bile is sometimes adulterated with or confused with pig bile (猪胆) or sheep bile (羊胆). These can be distinguished by HPLC analysis of bile acid profiles: ox bile contains predominantly cholic acid and deoxycholic acid, while pig bile contains hyodeoxycholic acid and lacks significant cholic acid.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any ingredient.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Niu Dan

Non-toxic

Ox bile is classically considered non-toxic. It contains bile salts and bile pigments which at very high doses can irritate the gastrointestinal tract, causing loose stools or abdominal cramping. Its strong cold nature means that improper use in those with Spleen-Stomach deficiency can lead to digestive weakness, but this is a property-based reaction, not a toxic effect.

Contraindications

Situations where Niu Dan should not be used or requires extra caution

Caution

Spleen and Stomach deficient cold — the extreme cold nature can damage digestive function, causing or worsening diarrhea, abdominal pain, and poor appetite.

Caution

Eye disorders not caused by wind-heat — may not be appropriate for eye conditions arising from Yin deficiency or other non-heat patterns.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

No specific contraindication for pregnancy is recorded in classical texts. However, because of its extreme cold nature and its ability to drain downwards through the bowels, it should be used only under strict practitioner guidance during pregnancy, and avoided during the first trimester when the fetal foundation is being established.

Breastfeeding

No data available on excretion into breast milk. Due to its bitter, cold nature and potential to cause diarrheal effects in the infant, it is advisable to avoid use during breastfeeding unless absolutely necessary and under professional supervision.

Children

Ox bile has been traditionally used for children in conditions such as febrile convulsion and jaundice. Dosage should be reduced proportionally based on body weight, generally 0.1–0.3 g per dose for young children. Use only under qualified supervision, and discontinue if digestive upset occurs.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Niu Dan

Ox bile contains bile acids that facilitate fat absorption. Concurrent use with fat-soluble vitamins (A, D, E, K) may theoretically increase their absorption, but high doses could compete for uptake and alter their bioavailability. Drugs that undergo enterohepatic circulation (such as certain contraceptives, digoxin, and some NSAIDs) may have altered pharmacokinetics when taken with ox bile. Caution is advised with anticoagulants because of a possible effect on vitamin K absorption. Always consult a healthcare provider before combining ox bile with prescription medications.

Dietary Advice

Foods and dietary considerations when taking Niu Dan

Avoid cold, raw foods and icy drinks while taking ox bile, as these can worsen Spleen-Stomach deficiency and counteract the herb's therapeutic direction in heat-clearing conditions. A bland, easily digestible diet is recommended to support the digestive system.

Botanical Description

Physical characteristics and morphology of the Niu Dan source animal

Although 牛胆 (ox bile) is an animal product rather than a plant, its medicinal source is the gallbladder of the ox (Bos taurus domesticus Gmelin) or water buffalo (Bubalus bubalis). The ox is a large domesticated ungulate with a sturdy build, short hair, and horns that vary in size by breed. It is widely raised throughout China for agriculture, dairy, and meat production. The fresh gallbladder is kidney-shaped, about 18–20 cm long and 5–6 cm wide, with a greenish-brown, slightly transparent liquid bile inside.

Sourcing & Harvesting

Where Niu Dan is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Winter (the twelfth lunar month), when the bile is most concentrated and traditionally considered most potent.

Primary growing regions

Sourced from healthy domesticated cattle (Bos taurus domesticus Gmelin) or water buffalo (Bubalus bubalis) across all provinces of China; no specific 道地药材 region.

Quality indicators

Good quality fresh ox bile is greenish-brown or dark brown, slightly transparent, and sticky. The dried powder should be yellow to brown, with a pronounced bitter taste and a characteristic fishy, slightly offensive smell. It should be free of adulteration from other animal biles (such as pig bile, which contains hyodeoxycholic acid).

Classical Texts

Key passages from the classical Chinese medical texts that describe Niu Dan and its therapeutic uses

《本草纲目》
原文：牛胆气味苦，大寒，无毒。主治心腹热渴，止下痢，除口焦燥，益目精。作丸服。以槐子酿服，明目。乌牛胆，治湿疸。
Translation: Ox bile: bitter in taste, very cold, non-toxic. It treats heat and thirst in the heart and abdomen, stops diarrhea, relieves dry mouth and vexation, and benefits the essence of the eyes. Administer as pills. Fermented with sophora fruit and taken to brighten the eyes. Black ox bile treats damp jaundice.

Historical Context

The history and evolution of Niu Dan's use in Chinese medicine over the centuries

Ox bile has been used in Chinese medicine since at least the Shen Nong Ben Cao Jing (Divine Farmer's Materia Medica). It was valued for clearing heat, resolving toxins, and brightening the eyes. During the Song dynasty, it became widely employed as a processing agent — most famously in the preparation of 胆南星 (bile-processed Arisaema), which transforms the hot, toxic raw herb into a cool, phlegm-clearing medicine. Ben Cao Gang Mu (Compendium of Materia Medica) records many formulas using ox bile, including pairing it with Sophora fruit for eye health. In the West, ox bile was historically used as a natural surfactant and in art materials, but its medicinal role in TCM remains focused on clearing internal heat and promoting bile flow.

Modern Research

A published study investigating the pharmacological effects or clinical outcomes of Niu Dan

1

Bile acids: chemistry, pathochemistry, biology, pathobiology, and therapeutics (Review, 2008)

Hofmann AF, Hagey LR. Bile acids: chemistry, pathochemistry, biology, pathobiology, and therapeutics. Cellular and Molecular Life Sciences, 2008, 65(16): 2461-2483.

This comprehensive review covers the chemistry and biological actions of bile acids, including those found in bovine bile. It describes their roles in fat digestion, cholesterol metabolism, and their anti-inflammatory and hepatoprotective effects – all relevant to the traditional uses of ox bile.

DOI

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.