What Yin Chen Hao Tang is for
The skin this formula clears is greasy and inflamed at the same time: an oily surface with red, congested patches and blocked follicles, worse after alcohol and fried food. The tongue coat in this pattern is yellow and greasy, the internal sign of the same Damp-Heat that shows on the face and scalp. The formula clears the Heat and drains the Dampness, giving that accumulated pathogen a way out of the body rather than only cooling the surface.
The surface looks oily and thickened, with red papules and blocked pores across the face, the scalp or the upper back, and the surrounding skin has a coarse, congested quality. Patches of seborrhoeic inflammation sit in the creases of the face and at the hairline, and mottled discolouration can settle where the Damp-Heat has been held for a long time. The whole picture is worse after alcohol and fried food, and it does not respond to washing, because the source is internal rather than on the surface.
Yin Chen is the leading herb for Damp-Heat with yellowing, and it clears and drains in the same movement. Zhi Zi takes the Heat down through the body's fluid route and Da Huang gives the Dampness a downward exit, so the pathogen is moved out rather than suppressed at the surface. The formula is only three herbs because its target is narrow: it is not a formula for building tissue or for calming a reaction, and nothing in it is nourishing.
It is a short course, days rather than weeks, for the acute greasy flare, and it is stopped once the surface has cleared. It is not for cold or deficient patterns, where the skin is pale, cool and thin, and it is not for chronic dry skin, which the draining would leave worse. True yellowing of the skin and eyes is a medical sign that needs diagnosis and management, and the formula is used alongside that care rather than instead of it.
Actions
- Clears Heat and drains Dampness
- Relieves Damp-Heat with yellowing
- Drains downward through the bowel and urine
- Clears inflammation associated with Damp-Heat
Properties
- Taste and temperature: Predominantly bitter and cold with a mild sweet note. Bitter clears Heat and dries Dampness, cold cools the inflammation.
- Organs: Liver, Gallbladder, Spleen, Stomach
- Channels: Liver, Gallbladder, Spleen
The pattern behind it
The pattern is Damp-Heat accumulating in the interior and obstructing the free flow. The Heat produces the inflammation and the thirst, the Dampness produces the greasy coat and the heaviness, and together they produce the yellowing or the greasy discoloured skin. The formula clears and drains in one movement.
Composition
The herbs in Yin Chen Hao Tang, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| Deputy | Yin Chen | 18 to 30 g | Slightly cold, Bitter, pungent | The leading herb for Damp-Heat and yellowing, clearing and draining at once. |
| Assistant | Zhi Zi | 9 to 15 g | Cold, Bitter | Clears Heat from the three burners and drains it out through the urine. |
| Da Huang | 6 to 9 g | Cold, Bitter | Purges the bowel so the Damp-Heat has a downward route out. |
Patterns it treats
Damp-Heat with Jaundice
Greasy, oily, inflamed skin with red papules, blocked follicles and congested patches that worsen with alcohol and fried food. Damp-Heat has accumulated inside, so the surface is oily and angry and discolouration settles where it has been held longest.
How the formula is built
Three herbs, three downwards. Yin Chen clears and drains the Damp-Heat, Zhi Zi gives it a urinary route, and Da Huang gives it a bowel route. The formula is small because its target is narrow: Damp-Heat that needs to be moved out, not nourished or dispersed.
Skin conditions it is used for
Where this formula appears in the skin conditions of the library.
Preparation and use
Decocted in water and taken warm, in two divided doses.
Modifications
- If the Dampness dominates, draining herbs are increased.
- If the Heat dominates, cooling herbs are increased.
- If there is constipation, the purging herb is kept; if not, it is reduced.
- If the pattern is cold, a warming formula is used instead.
Timing
Taken warm in two divided doses.
Duration
Acute use: three to ten days, reassessed as symptoms improve, and not intended for long-term use.
Diet while taking it
Avoid alcohol, fried and greasy food, which are the dietary sources of the Damp-Heat.
Safety
Contraindications
Avoid in Yin-type jaundice, where the discolouration is dull yellow and the pattern is cold and deficient. Avoid in cold or deficient patterns and in chronic dry skin. Any true jaundice needs medical diagnosis.
Interactions
Da Huang can affect electrolytes and interact with diuretics and digoxin. Berberine-type interactions are not relevant here, but the purgative action requires care.
Pregnancy
Generally contraindicated in pregnancy. Da Huang is classified as a pregnancy-caution herb and purges the bowel.
Breastfeeding
Use only under professional guidance.
Children
Used only with professional supervision.
Before you use it
Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription, and jaundice or persistent greasy inflammation needs medical assessment.
General safety references
General references for herbal hepatotoxicity and herb-drug interactions; they are not specific to this formula.
- Review article: Herbal hepatotoxicity - an update on traditional Chinese medicine preparations. Alimentary Pharmacology & Therapeutics, 2014. PMID: 24844799.
- Interactions between herbal medicines and prescribed drugs: an updated systematic review. Drugs, 2009. PMID: 19719333.
- Warfarin and food, herbal or dietary supplement interactions: a systematic review. British Journal of Clinical Pharmacology, 2021. PMID: 32478963.
Selected PubMed records
Real PubMed records for the modern, non-TCM discussion of this formula. They are references, not a claim that the formula is proven for any skin condition.
- Therapeutic mechanism of Yīn-Chén-Hāo decoction in hepatic diseases.. World journal of gastroenterology, 2017. PMID: 28275293.
- Yin-Chen-Hao-Tang alleviates biliary obstructive cirrhosis in rats by inhibiting biliary epithelial cell proliferation and activation.. Pharmacognosy magazine, 2015. PMID: 25829784.
Origin and history
Shang Han Lun (伤寒论, Treatise on Cold Damage) by Zhang Zhongjing, Eastern Han dynasty, around 220 CE.
Yin Chen Hao Tang is one of the oldest formulas in continuous use, recorded by Zhang Zhongjing for Damp-Heat with yellowing. Its three herbs and its downward draining logic made it the model for treating Damp-Heat that needs an exit, and its skin uses follow the same pattern: greasy, inflamed, yellow-coated presentations.
Classical record
Zhang Zhongjing recorded the three-herb formula for Damp-Heat with yellowing, clearing the Heat and draining the Dampness out through the bowel and urine.
Shang Han Lun (伤寒论, Treatise on Cold Damage), Zhang Zhongjing, Eastern Han dynasty.
Evidence note
No controlled trial of this treatment in skin conditions was identified for this entry. What is described here rests on the classical and later materia medica record and on traditional clinical use, not on controlled trial evidence, and it is not a prediction of benefit. Where skin-specific research does exist it is linked above.
Common questions
Is it a treatment for jaundice?
It is the classical formula for the Damp-Heat type of yellowing, but jaundice is a medical sign that needs diagnosis and management, so the formula is used alongside medical care.
Can it help acne?
Where the acne is greasy and inflamed with a yellow greasy tongue coat, yes, in a short course.
Why does it contain a purgative?
Because Damp-Heat needs an exit. Da Huang gives it a downward route through the bowel.
How long is it used?
Three to ten days, reassessed as symptoms improve.