What Zeng Ye Tang is for
This is the formula for skin that has dried from the inside out: thin, shrunken, inelastic tissue that no ointment reaches. Three cold, moistening herbs in large doses refill the fluid reserve the skin draws on, so the surface softens because the body behind it has been replenished.
The skin is thin, dry and shrunken, with a papery look and a loss of elasticity, so a fold held between the fingers stays standing instead of springing back. It feels rough and slightly warm rather than cold, and it can crack at the knuckles, lips and shins. There is no rash and nothing to see but the dryness itself, which is why external treatment has little to work on. The change usually dates from an illness, a fever or a loss of fluid, and it affects the whole surface rather than one patch.
Xuan Shen, Sheng Di Huang and Mai Dong all nourish Yin and generate fluids, in large doses because the deficit is deep. Xuan Shen cools and softens as it moistens, Sheng Di Huang rebuilds the deepest layer of fluid and Blood, and Mai Dong moistens the upper body so the change reaches the face and lips as well as the limbs. Nothing in the formula moves, warms or drains: its single action is to replace fluid, which is why it can be added to another formula when dryness is what blocks progress.
It is not for skin that is greasy, sodden or weeping, where more moisture is the last thing the tissue needs, and it is not a substitute for finding out why the fluid was lost. The dryness here is deep and slow to fill, so a course is judged over weeks rather than days. Skin that stays dry through this approach, or dryness that comes with a change in the tissue itself, needs medical assessment rather than a longer course.
Actions
- Nourishes Yin and generates fluids
- Moistens the intestines
- Softens dryness of the skin and mouth
- Supports recovery after fluid loss
Properties
- Taste and temperature: Predominantly sweet and bitter with a cold quality. Sweet and cold generate fluids, bitter clears residual Heat.
- Organs: Stomach, Lungs, Kidney
- Channels: Stomach, Lung, Kidney
The pattern behind it
The pattern is deep fluid and Yin depletion. When the body's fluids are exhausted the intestines dry, the mouth dries and the skin loses its moisture. The formula restores the fluids with three moistening herbs in large doses, which is why it is used for the deeper dryness rather than for the light post-illness dryness.
Composition
The herbs in Zeng Ye Tang, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| Deputy | Xuan Shen | 30 g | Cold, Sweet, bitter, salty | Nourishes Yin, clears Heat and softens, used in a large dose for deep dryness. |
| King | Sheng Di Huang | 24 g | Cold, Sweet, bitter | Nourishes Yin and Blood deeply, the main source of restored fluid. |
| Mai Dong | 24 g | Slightly cold, Sweet, bitter | Moistens the Lungs and Stomach and generates fluids. |
Patterns it treats
Yin Deficiency
Thin, shrunken and inelastic skin with a papery look and no spring when folded, dry enough to crack at the knuckles, lips and shins, with no rash to treat. The dryness sits in the tissue rather than on it, so the surface softens only when the fluid reserve behind it is refilled.
How the formula is built
Three moistening herbs in large doses. There is no moving, warming or draining herb, because the formula does one thing: replace the fluids. That simplicity is why it can be added to other formulas when dryness is the main obstacle.
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 or three divided doses.
Modifications
- If the constipation persists, a gentle draining herb is added.
- If Heat remains, cooling herbs are added.
- If the dryness is less severe, the doses are reduced.
- If Dampness appears, the formula is stopped.
Timing
Taken warm in two or three divided doses.
Duration
Acute use for post-febrile constipation: one to five days. For chronic dryness, one to four weeks under guidance.
Diet while taking it
Fluids in small sips and moistening food; avoid drying food and alcohol.
Safety
Contraindications
Avoid in Yang deficiency with cold limbs and loose stools, and in Dampness with a greasy coat. Persistent constipation needs medical assessment.
Interactions
No major interaction is recorded in the reference.
Pregnancy
Generally considered safe in pregnancy when used appropriately under professional guidance, as the three herbs are gentle and moistening.
Breastfeeding
Considered acceptable 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 persistent constipation or unexplained skin drying 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.
Origin and history
Wen Bing Tiao Bian (温病条辨, Systematic Differentiation of Warm Diseases) by Wu Jutong, Qing dynasty, 1798.
Zeng Ye Tang comes from Wu Jutong's warm-disease treatise, where prolonged fever was recognised as exhausting the body's fluids. Its three-herb design made it a building block, added to other formulas when dryness was the obstacle, and its skin use follows the same logic: deep dryness calls for fluid restoration rather than surface treatment.
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
Can it help dry skin?
Where the dryness comes from deep fluid depletion with a dry red tongue and dry stool, yes, over one to four weeks.
How is it different from Yi Wei Tang?
Yi Wei Tang is lighter and focused on the Stomach during recovery. Zeng Ye Tang is stronger, for deeper fluid depletion with constipation.
Who should avoid it?
Anyone with Dampness and a greasy coat, or with Yang deficiency and loose stools.
When should constipation be assessed?
If it is persistent, painful or accompanied by bleeding or weight loss, medical assessment is needed.