About This Herb*
Traditional Chinese Medicine background and properties
Herb Description*
Qing Dai (natural indigo) is a deep blue powder extracted from the leaves of several indigo-producing plants. It is a potent Heat-clearing herb used for inflammatory skin conditions, bleeding caused by Blood Heat, coughs with blood-streaked phlegm, and childhood febrile convulsions. In modern clinical research, it has attracted considerable attention for ulcerative colitis and psoriasis treatment.
Herb Category*
Main Actions*
- Clears Heat and Resolves Toxicity
- Cools the Blood and Resolves Macules
- Clears Liver Fire
- Calms fright and stops convulsions
- Clears Lung Heat
How These Actions Work*
'Clears Heat and resolves toxins' means Qing Dai has a strong ability to neutralize Heat-toxins in the body. In practice this applies to febrile diseases with high fever and skin eruptions (macules and papules), as well as sore throats, mouth ulcers, and toxic sores on the skin. It can be taken internally or applied topically to affected areas.
'Cools Blood and disperses macules' means Qing Dai enters the Blood level and calms reckless movement of Blood caused by Heat. When excessive Heat forces Blood out of the vessels, it produces rashes, purple-red spots on the skin, vomiting of blood, or nosebleeds. Qing Dai's cold, salty nature allows it to penetrate the Blood level and cool it down, which is why it is a key herb for fever-related skin eruptions and bleeding due to Blood Heat.
'Drains Liver Fire' is one of Qing Dai's most distinctive actions. It enters the Liver channel specifically and is used when the Liver harbors excess Fire. Liver Fire can rise upward and attack the Lungs, causing a dry cough with chest pain and blood-streaked phlegm, a condition known as 'Liver Fire invading the Lungs.' Qing Dai addresses this by clearing the Fire at its source in the Liver while also cooling the Lungs.
'Calms fright and stops convulsions' refers to Qing Dai's ability to address childhood seizures and convulsions caused by high fever. In TCM, extreme Heat can stir internal Wind, leading to convulsions and tremors, especially in children. By draining Liver Fire (the Liver governs sinews and tendons), Qing Dai indirectly reduces spasms and convulsions.
Patterns Addressed*
In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Qing Dai is traditionally associated with these specific patterns.
The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.
Why Qing Dai addresses this pattern
Qing Dai is cold in temperature and salty in taste, giving it the ability to enter the Blood level and cool it. When Heat invades the Blood, it forces Blood out of the vessels, producing rashes, macules, nosebleeds, and vomiting of blood. Qing Dai directly clears the Heat driving this reckless Blood movement, while its toxin-resolving action addresses the underlying pathogenic Heat. It is often combined with raw Rehmannia (Sheng Di Huang), Moutan bark (Mu Dan Pi), or Imperata root (Bai Mao Gen) for Blood Heat bleeding.
A practitioner would look for one or more of these signs
Nosebleed from Blood Heat
Vomiting blood due to Heat in the Blood
Purple-red macules and rashes from febrile illness
Blood-streaked sputum
Why Qing Dai addresses this pattern
Qing Dai enters the Liver channel and has a pronounced ability to drain Liver Fire. Classical sources describe it as able to 'greatly drain Liver Fire' (大泻肝经实火). When Liver Fire blazes upward, it can produce headache, red eyes, irritability, and dizziness. When Liver Fire invades the Lungs (a pattern called 'Wood insulting Metal'), it causes a persistent cough with chest and rib-side pain and blood-streaked phlegm. Qing Dai is the core herb for this specific pattern, typically paired with Hai Ge Ke (clam shell) in the classical formula Dai Ge San.
A practitioner would look for one or more of these signs
Persistent cough from Liver Fire invading the Lungs
Chest and rib-side pain
Blood-streaked phlegm
Irritability and easy anger
Why Qing Dai addresses this pattern
Qing Dai's cold, salty nature makes it effective against intense Heat-toxin conditions presenting on the skin and mucous membranes. It can be used internally for sore throat (especially mumps and tonsillitis) and mouth ulcers, and applied topically for toxic sores, skin abscesses, and erysipelas. Its ability to both clear Heat and cool Blood makes it particularly suited for toxic Heat conditions where there is also redness, swelling, and potential bleeding.
A practitioner would look for one or more of these signs
Oral ulcers from Heat-toxin
Swollen, painful throat
Toxic sores and skin lesions
Erysipelas (red, hot skin)
TCM Properties*
Cold
Salty (咸 xián)
Processed / Derived product (加工品 jiā gōng pǐn)
This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.