OthersDampness-drainingBenincasae Exocarpium

Dong Gua Pi (Chinese Waxgourd Peel)

A practical guide to Dong Gua Pi: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

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Last reviewed Oct 29, 2026

Quick Facts

Latin Name	Benincasae Exocarpium
Chinese Name & Pinyin	冬瓜皮 · Dong Gua Pi
Medicinal Part	Others
The item	Dong Gua Pi is the dried outer peel of Benincasa hispida, a gourd-family plant. Fu Ling is not this herb. It usually goes into decoctions and home soups.
Nature and channels	Sweet, bland, cool. Enters the Spleen, Small Intestine, and Bladder. Sweet bland cool drains water-dampness and clears summer-heat.
Pharmacopoeia line	Clears summer-heat and drains water. Used for summer-heat with body heaviness, edema and swelling, difficult urination, and abdominal stuffiness.
Pattern cues	Limb edema. Difficult urination. Summer irritability and thirst. Body heaviness.
In this article	Dong Gua Pi versus Fu Ling. Draining surface dampness versus fortifying the spleen. Why long-term drinking is not advised. Why pregnancy is a caution. Why persistent edema needs a clinic. Who should skip it.

What Is Dong Gua Pi?

Dong Gua Pi (冬瓜皮; Dōng Guā Pí; Latin: Benincasa hispida; English: wax gourd peel) in the current pharmacopoeia is the dried outer peel of the gourd-family wax gourd, usually shaved fresh at harvest and sun-dried into the raw slice. It is sweet, bland, and cool, enters the Spleen, Small Intestine, and Bladder channels, and its core actions are to clear and drain water-dampness, and to clear summer-heat. It usually goes into decoctions and home soups. The usual amount is 10–15 g. It needs no special decocting order. It can also be boiled as a light summer tea.

It is not Fu Ling. Poria is neutral, sweet and bland, and it both drains dampness and fortifies the spleen, with a spirit-calming action. This peel is cool and drains mainly the surface water-dampness. Use caution in pregnancy. Deficiency-cold with loose stool is a poor match. Persistent edema needs a clinic first. Cool herbs may weaken a weak stomach. Do not boil it yourself as a long-term daily drink.

It is used most often for three patterns:

Limb edema and difficult urination — seek care
Summer-heat heaviness, irritability, and thirst
Mild facial acne and skin itching in summer

Sweet, bland, and cool, it is not a daily “summer slimming water” to keep drinking. Draining when there is no water-dampness weakens the spleen and stomach.

When summer-heat mingles with water-dampness, body heaviness, edema, and irritability are common. Dong Gua Pi is sweet, bland, and cool. It drains water-dampness and clears summer-heat, which is why it appears in Qing Shu Dong Gua Pi Tang (Summer-Heat-Clearing Wax Gourd Peel Decoction)–type formulas. It drains more than it holds. A cold weak stomach, with no damp-heat, gets worse if more is added.

Dong Gua Pi is not a catch-all water or summer-heat peel. In deficiency-cold, with loose stool, or in pregnancy, using it alone is a poor match. Dried peel or fresh peel, and whether it belongs in a formula, should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Dong Gua Pi: Materia Medica Profile

Identification & Quality Standard

Benincasae Exocarpium

Botanical Origin

The dried ripe exocarp of Benincasa hispida (Thunb.) Cogn. (Cucurbitaceae).

Production Regions

Produced nationwide.

Quality Requirements

Superior material is thin, outer greenish and inner white.

Macroscopic Features

Irregular thin slices, often curved, 0.1~0.2 cm thick; externally grayish-yellow or grayish-green, with fine white hairs and waxy powder; inner surface grayish-white, rough; texture light and brittle; faint odor; bland taste.

Main Regions and Quality Identification

Traditional materia medica and industry experience value the Dong Gua Pi of certain producing areas, but actual quality also depends on variety, harvest time, processing, and storage. The main producing areas of the wax gourd are wide — grown in several provinces of southern China and several provinces of northern China; in the humid south, the gourd grows fast with a thicker peel; in the north with ample sunlight, the peel is firmer. In appearance, good-quality Dong Gua Pi is irregular curled fragments, gray-green or yellowish-white on the surface, with sparse dot-like protrusions or residual fuzz, brittle in texture, loose on the broken surface, a faint fresh scent, and a bland taste. The common look-alikes are the peels of other gourds — such as the pumpkin peel — deeper in color and harder in texture, clearly different from the appearance and smell of Dong Gua Pi.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Sweet; CoolSpleenSmall Intestine

1. Records in Classic Materia Medica

Kai Bao Ben Cao: for the first time makes clear that Dong Gua Pi can "govern wind-heat, boost qi and endure aging, remove chest and heart fullness, and dispel the heat of the head and face."
Ben Cao Gang Mu: supplements that it can "clear heat-toxin, disperse carbuncle swellings, free the large and small intestines, and suppress the dan-shi (mineral elixir) toxin."
De Pei Ben Cao: further points out that it "walks the spleen, frees water, treats swelling, and dispels edema."

These records all center on its water-dampness-clearing and evil-heat-dispelling actions — reasonably corresponding to some of its modern application directions.

2. How Views of Its Nature Changed

Physicians differ to a degree: some lean to its clearing-and-draining action, seeing it as a purely water-freeing, evil-clearing item — fitting the patterns of damp-heat stagnation and water-dampness accumulation, and stressing it must not be used for the deficiency-cold constitution; others notice that although it is a clearing-and-draining item, its action is gentle and does not harm the upright qi — it can serve as an assistant in tonifying formulas, helping to free the water-dampness inside the body and avoid the stagnation that tonics can cause. This difference shows that Dong Gua Pi is gentle in nature with a targeted fitting range — not a universal clearing-and-draining item.

Core Efficacies & Traditional Applications

Traditional Functions

Promotes diuresis and reduces edema, clears summerheat.

1. First Direction: Clearing and Draining Water-Dampness

Traditional action: traditional Chinese medicine holds that one core action of Dong Gua Pi is clearing and draining water-dampness — helping to free the stagnant water inside the body and ease the discomfort of water-dampness accumulation.
Typical signs: the summer body heaviness, mild limb swelling, and difficult urination of summer-heat mixed with water-dampness; or the epigastric-abdominal stuffiness and sticky stool from irregular eating and poor spleen-stomach transformation.
Usual combinations: often paired with the water-freeing, dampness-percolating herbs such as Fu Ling and Ze Xie to strengthen the water-dampness clearing; with mild summer-heat along, also paired with the summer-heat-clearing herbs such as He Ye and Hua Shi, attending to both heat-dispelling and dampness-freedom.
Who should not self-use: those with a deficiency-cold constitution — usually with cold hands and feet and loose, unformed stool — should not use Dong Gua Pi alone, to avoid worsening the deficiency-cold symptoms.

2. Second Direction: Clearing Summer-Heat

Traditional action: another core action is clearing summer-heat — helping to remove the evil-heat caused by summer-heat and ease the dry, hot discomfort of summer.
Typical signs: the summer external summer-heat — irritability with thirst, dizziness with head fullness, and short red urine; or the mild facial acne and skin itching from the summer-heat steaming upward.
Usual combinations: often paired with the summer-heat-clearing, toxin-resolving herbs such as Xi Gua Cui Yi and Jin Yin Hua to strengthen the summer-heat clearing; with spleen-stomach weakness along, also paired with the dampness-transforming, stomach-harmonizing herbs such as Huo Xiang and Pei Lan, to avoid the heat-clearing herbs harming the spleen and stomach.
Who should not self-use: those with a usually weak spleen and stomach — prone to cold stomach pain and poor appetite — should not use Dong Gua Pi alone, to avoid affecting the spleen-stomach function.

3. Classic Pairing: Dong Gua Pi With Fu Ling

The common pair is Dong Gua Pi with Fu Ling: bland and cool, Dong Gua Pi excels at clearing the water-dampness of the skin and body surface, with an outward-reaching tendency; sweet-bland and neutral, Fu Ling excels at percolating the water-dampness of the spleen-stomach and the interior, with an inward-percolating tendency. Combined, they both strengthen the overall water-dampness-clearing and avoid the bias any single herb may bring — mutually coordinating — fitting the summer water-dampness stagnation and poor spleen-stomach transformation patterns of body heaviness and difficult urination. This pairing needs the physician's pattern diagnosis — do not pair freely on your own.

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. Main Chemical Constituents

The publicly available modern research data shows the main constituents detected in Dong Gua Pi are polysaccharides, flavonoids, triterpenoids, and small amounts of organic acids and minerals. To be clear: detecting these constituents in the plant does not equal a corresponding effect after human intake; in in vitro experiments, some of these constituents show a certain antioxidant activity; in animal experiments, some extracts show a certain urine-excretion-promoting effect; to date, no sufficient human clinical research confirms the specific effects of these constituents.

2. Current Research Directions

Current modern research mainly centers on the extraction and isolation of the active constituents of Dong Gua Pi, and the observation of their effects in animals:

The urine-excretion direction — some animal experiments show the extract of Dong Gua Pi can increase the urine volume of experimental animals to a degree — but whether this effect fully corresponds to the traditional water-freeing action still needs more human research verification.
The antioxidant direction — experiments observe a certain antioxidant ability of its extract — but whether this effect can appear in the human body also lacks clear clinical evidence.

3. Limitations of Current Research

Lab results are not clinical efficacy — the results of animal and in vitro experiments cannot be directly equated with the actual effect after humans take Dong Gua Pi — the experimental environment differs from the human physiological state.
Extracts and monomers are not the same as traditional slices — modern research mostly uses extracts or monomer constituents — their purity and dose differ greatly from the daily-used Dong Gua Pi slices — cannot be converted simply.
Doses and preparation methods vary between studies — different studies process Dong Gua Pi differently, with different extracted constituent types and contents — making the experimental results hard to compare uniformly.
A single component does not define the whole herb — the action of Dong Gua Pi is the joint result of many constituents — a single constituent's activity cannot represent the whole herb's effect.

Comparing Similar Herbs

1. What They Share

Fu Ling is chosen for comparison with Dong Gua Pi — the two share these points:

Both have the main action of clearing and draining water-dampness — both can help free the stagnant water inside the body.
Both are used for the traditional patterns of water-dampness stagnation — body heaviness and difficult urination.
Both can appear in the summer-regulating medicinal food or short-term tea scenes — with both requiring consideration of the individual constitution and dose.

2. The Key Differences: Dong Gua Pi vs. Fu Ling

Nature and flavors: Dong Gua Pi is cool with sweet and bland flavors, entering mainly the spleen, small-intestine, and bladder channels — clearing-draining, gentle, not harming the upright qi; Fu Ling is neutral with sweet and bland flavors, entering mainly the heart, spleen, lung, and kidney channels — peaceful in nature, both freeing water and strengthening the spleen — with a certain tonifying action.
Focus: Dong Gua Pi focuses on clearing water-dampness and clearing summer-heat — best at easing the surface discomfort and urine problems of summer heat mixed with dampness — with a more obvious effect on the surface water-dampness stagnation; Fu Ling focuses on freeing water, draining dampness, strengthening the spleen, and quieting the heart — best at regulating the internal water-dampness stagnation of poor spleen transformation, while helping to settle the heart-mind and improve insomnia.
Qi tendency: Dong Gua Pi leans to clearing and draining — helping to free the stagnant water-dampness and direct the qi downward, avoiding the water-dampness rising; Fu Ling leans to percolating and spleen-strengthening — both draining the water-dampness and boosting the spleen's transformation — the qi gets a certain support while being directed.
Best fit: Dong Gua Pi fits the summer heat obvious, with surface heaviness, mild facial swelling, and irritability with thirst; Fu Ling fits the usually weak spleen-stomach, with poor appetite, loose stool, and mild insomnia — usable in any season as long as the spleen-deficiency water stagnation pattern is present.
Not suitable: Dong Gua Pi does not fit those with a deficiency-cold constitution or spleen-stomach weakness causing loose stool — using it alone may worsen the deficiency-cold; Fu Ling does not fit those with exuberant internal damp-heat, short red urine with mouth sores — using it alone may help the heat pathogen.
Use scenes: Dong Gua Pi appears more in the daily regulation of summer — boiled water or soup — as a food ingredient to ease summer dampness-heat; Fu Ling appears more in formula pairings — for the chronic spleen-deficiency water stagnation — or as a base ingredient in medicinal food to strengthen the spleen-stomach function.

3. One-Sentence Summary

Simply put, Dong Gua Pi leans toward clearing the summer dampness-heat and easing surface discomfort, whereas Fu Ling leans toward strengthening the spleen, freeing water, and improving the internal water stagnation. Both can be used for the water-dampness-related problems, but they are not interchangeable.

Classical Formulas Containing Dong Gua Pi

Classic Formula 1: Dong Gua Pi San (Wax-Gourd-Peel Powder)

Combination logic: In Dong Gua Pi San, Dong Gua Pi is the main herb — the lord — chiefly exerting the water-dampness-clearing action to solve the internal water-dampness stagnation; paired with the ministers Fu Ling and Ze Xie to strengthen the water-freeing, dampness-percolating effect; with Bai Zhu as the assistant to strengthen the spleen and protect the spleen-stomach upright qi from the water-freeing herbs. Dong Gua Pi carries the core clearing-and-draining role in the formula, but the herb alone cannot be used — a single herb cannot attend to the synergy of spleen-strengthening and stronger water-freeing.

Traditional use: traditionally for the limb edema, difficult urination, and epigastric-abdominal stuffiness of water-dampness stagnation — fitting the water stagnation patterns of spleen-deficiency poor transformation.

Modern note: the modern clinical use of this formula requires the doctor's pattern diagnosis and standard care — do not self-apply just because the formula name relates to a certain disease.

Classic Formula 2: Qing Shu Dong Gua Pi Tang (Summer-Heat-Clearing Wax-Gourd-Peel Decoction)

Combination logic: In Qing Shu Dong Gua Pi Tang, Dong Gua Pi is the lord — exerting the summer-heat-clearing and water-dampness-clearing actions to solve the summer problem of heat mixed with dampness; paired with the minister Xi Gua Cui Yi to strengthen the summer-heat clearing; with Pei Lan as the assistant to transform dampness and harmonize the stomach, protecting the spleen-stomach from the summer-heat and water-freeing herbs. Dong Gua Pi simultaneously carries the heat-clearing and dampness-freeing roles in the formula, but the herb alone cannot be used — a single herb cannot attend to the synergy of heat-clearing and dampness-transforming.

Traditional use: traditionally for the summer external summer-heat with water-dampness stagnation — irritability with thirst, body heaviness, and short red urine.

Modern note: the modern clinical use of this formula requires the doctor's pattern diagnosis and standard care — do not self-apply just because the formula name relates to a certain disease.

Formulas vs. Single Herbs

A formula is many herbs working together — through the lord-minister-assistant-courier pairing, attending to different effects and fitting situations; a single herb cannot simply replicate a full formula's effect, because a single herb cannot possess the multiple actions in a formula at once. The doses and combinations in a formula are holistic — the dose and pairing of different herbs affect the overall effect — do not build formulas from online articles. The common misunderstanding: if a herb works in a formula, taking it alone produces the same effect — in fact, a formula's effect is the synergy of many herbs, not a single herb's independent effect.

Diet & Daily Home Use

1. Home Tea and Porridge

(1) Dong Gua Pi Lü Dou Cha (Wax-Gourd-Peel and Mung Bean Tea): dried Dong Gua Pi 10 g, mung beans 15 g. Wash the dried peel and put it with the mung beans in a pot, add adequate water, boil on high heat then turn to low heat for 15 minutes, and drink the liquid. Suited to the hot summer weather with body heaviness and irritability with thirst — a daily heat-clearing, dampness-freeing tea. Not for those with a deficiency-cold constitution or loose stool, or children with a weak spleen and stomach. Suggested: 2 to 3 times a week; do not drink for many days in a row.

(2) Dong Gua Pi Yi Mi Zhou (Wax-Gourd-Peel and Coix Porridge): dried Dong Gua Pi 15 g, Yi Mi 30 g, rice 50 g. Wrap the dried peel in gauze, soak the Yi Mi for 1 hour in advance, put both with the rice in a pot, add adequate water and cook into porridge; when done, remove the gauze pouch. Suited to the summer water-dampness stagnation, epigastric-abdominal stuffiness, and difficult urination — a gentle food-therapy regulation. Not for pregnant women or those with a deficiency-cold constitution. Suggested: once every 1 to 2 weeks; do not eat it as a daily staple long-term. Note: the Dong Gua Pi slice is a medicinal slice — different from the fresh peel of a wax gourd — choose qualified slices from a regular channel; do not directly substitute fresh market peel for the medicinal slice.

2. Decoction and Processing Differences

The raw Dong Gua Pi is the commonly used medicinal slice; no widely applied processed form exists so far. For home decoction, no special handling is needed — decoct it directly with other foods or herbs, or boil it in water alone. With its loose texture, Dong Gua Pi needs no pre-boiling, late addition, or bag-boiling; the basic home method is to soak it in water for 10 to 15 minutes, then bring it to a boil. Different forms cannot be converted directly — the medicinal slice dose differs from the tea and medicinal-food amounts — do not adjust freely.

3. Dosage and Course

The common dose in traditional prescriptions is 10–15 g; for food therapy, the dose can be suitably reduced to 5–10 g. The food-therapy dose is gentler — for daily regulation — while the medicinal dose needs the physician's adjustment to the pattern. Long-term continuous use is not advised — generally continuous use should not exceed 7 days; if the symptoms do not ease, consult a physician or pharmacist. Special groups — pregnant women, children, the elderly, and those with liver or kidney impairment — should consult a physician or pharmacist before use.

Contraindications & Safety Warnings

1. Who Should Avoid It

Deficiency-cold constitution — usually with cold hands and feet, loose stool, and cold stomach pain — Dong Gua Pi should not be used, to avoid worsening the deficiency-cold symptoms.
Pregnancy and breastfeeding — use under a physician's guidance, not on your own.
Children and the elderly — weaker spleen-stomach function — adjust the dose and consult a physician.
Liver or kidney impairment — assess according to the specific situation — do not use on your own.
Allergy to gourd (Cucurbitaceae) plants — those allergic to pumpkin or cucumber may be allergic to Dong Gua Pi — use with caution.
Those in special treatment — such as long-term medication users — consult a doctor before use.

2. Interactions and Diet Notes

There is no sufficient evidence of a general "food clash" between Dong Gua Pi and ordinary foods, but certain herbs can interact with specific drugs. Dong Gua Pi is cool in nature — if you are taking warming Chinese patent medicines, such as Fu Zi Li Zhong Wan, it may affect the warming effect; if you are taking blood-pressure or glucose-lowering drugs, note that Dong Gua Pi has a diuretic action that may strengthen their effects — monitor the relevant indicators; the interactions of Dong Gua Pi with anticoagulant and sedative drugs lack clear evidence — those taking such drugs should consult a doctor or pharmacist first, avoiding self-use.

3. Adverse Reactions and Overdose Risk

With normal use, Dong Gua Pi has few adverse reactions, but overuse or long-term use may cause stomach discomfort — such as a cold feeling in the stomach, loose stool, and poor appetite. If marked discomfort or allergy signs appear (such as rash or itching), persistent vomiting, breathing difficulty, altered consciousness, or rapidly worsening symptoms, stop at once and seek medical care — do not delay treatment.

Frequently Asked Questions About Dong Gua Pi

What is Dongguapi? Is it the same as Dongguazi or Fuling?

Dongguapi is the dried outer pericarp of Benincasa hispida, Latin name Benincasae Exocarpium. It is a common Chinese medicine centered on promoting urination and reducing swelling. Dongguazi clears heat and transforms phlegm while expelling pus. Fuling promotes urination and drains dampness while strengthening the spleen. They cannot be used interchangeably in equal amounts. Prescribe as Dongguapi. Caution in deficiency swelling due to malnutrition.

What are the composition and effects of Dongguapi?

Pharmacopoeial name Dongguapi, Latin Benincasa hispida (Thunb.) Cogn. Sweet in taste, cool in nature, enters the Spleen and Small Intestine meridians. Functions to promote urination and reduce swelling. Used for edema and fullness, inhibited urination, summer-heat thirst, and scanty dark urine. Promotes urination and reduces swelling.

How to choose between raw and processed? Can Fuling replace it?

Pericarp is used raw. Fuling emphasizes strengthening the spleen rather than strongly reducing swelling, and cannot replace it in equal amounts. Commercial products are standardized; do not adjust arbitrarily.

What is the dosage of Dongguapi? Can it be used daily as a swelling-reducing tea?

Decoction, 9-30g. Modern use requires physician-determined dosage. It is not a year-round "Dongguapi tea." Deficiency swelling due to malnutrition will be further injured by prolonged use. Edema requires short-term, physician-determined dosage and cannot replace evaluation.

What are the contraindications of Dongguapi? Can pregnant women use it?

Not suitable for deficiency swelling due to malnutrition. Pregnant women require physician evaluation. Stop if fatigue or frequent urination occur. Seek immediate medical care for severe edema or high fever.

Can Dongguapi promote urination and reduce swelling?

It can assist edema and fullness, inhibited urination, summer-heat thirst, and scanty dark urine. It promotes urination and reduces swelling, but is not a specific remedy for all edema or all thirst.

Can Dongguapi be taken daily as a swelling-reducing or diuretic tea?

Edema and fullness can be used short-term in formulas; deficiency swelling due to malnutrition will be further injured. The idea that "Dongguapi must reduce swelling" cannot replace evaluation. Promoting urination and reducing swelling requires physician-determined formulation and dosage.

How to choose between Dongguapi, Dongguazi, Fuling, Zexie, and Cheqianzi?

Dongguapi promotes urination and reduces swelling, suited to edema. Dongguazi clears heat and expels pus. Fuling promotes urination and strengthens the spleen. Zexie promotes urination and drains heat. Cheqianzi promotes urination for heat strangury. Choose Dongguapi for reducing swelling; Dongguazi for expelling pus; Fuling for strengthening the spleen; Zexie for draining heat; Cheqianzi for relieving strangury. Pattern differentiation applies, but large doses of Dongguapi are contraindicated in deficiency swelling due to malnutrition.

How is Dongguapi commonly modified? What is a representative usage?

Modifications depend on the pattern. Add Fuling for edema; add Maidong for thirst. Specify Dongguapi; do not substitute Fuling in equal amounts for reducing swelling.

How to select and store Dongguapi?

Choose regular Chinese medicinal materials with intact pericarp. Discard if moldy, damp, or abnormal in odor. Store in a ventilated, dry place. Purchase "Dongguapi"; do not substitute Dongguazi or Fuling in equal amounts for promoting urination and reducing swelling.

Related Products

Nong's Dong Gua Pi Concentrated Granules

Nong's Dong Gua Pi (Winter Melon Peel) Single Herb 5:1 Concentrated Granules $50.03

Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.