Herb Peel / Rind (皮 pí / 果皮 guǒ pí)

Dong Gua Pi

Wax Gourd Peel · 冬瓜皮

Benincasa hispida (Thunb.) Cogn. · Exocarpium Benincasae

Also known as: Bai Gua Pi (白瓜皮)

Dong Gua Pi (Wax Gourd Peel) plant

Images shown are for educational purposes only

Winter melon peel is a gentle, cooling herb used primarily to help the body release excess water and reduce swelling. It is a common home remedy in East Asia, often brewed as a simple tea during hot summer months to relieve thirst and promote healthy urination. Because it is mild and food-grade, it is well tolerated and frequently combined with other herbs for stronger effect.

Category Dampness-draining herbs (利水渗湿药) Water-draining and edema-reducing herbs (利水消肿药)
Therapeutic focus Fluid Retention and Edema Urinary Health Summer Heat Relief Weight management

TCM Properties

Temperature

Cool

Taste

Sweet (甘 gān), Bland (淡 dàn)

Channels entered

Spleen, Small Intestine, Lungs

Parts used

Peel / Rind (皮 pí / 果皮 guǒ pí)

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What This Herb Does

Every herb has a specific set of actions — here's what Dong Gua Pi does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Dong Gua Pi is primarily used to support these areas of health:

Fluid Retention and Edema Urinary Health Summer Heat Relief Weight management

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Dong Gua Pi performs to restore balance in the body:

Promotes Urination and Reduces Edema Clears Heat and Resolves Summer-Heat Clears Damp-Heat from the Lower Burner

How these actions work

'Promotes urination and reduces edema' is the primary action of Dōng Guā Pí. It gently encourages the body to pass more urine, which helps drain excess water and fluid that has accumulated in the tissues. This is the herb's main clinical use: treating swelling (edema) in the face, limbs, or abdomen, along with reduced or difficult urination. Because the herb is mild and non-toxic, it is often used as a gentle supporting herb alongside stronger diuretics like Fú Líng (Poria) or Zhū Líng (Polyporus). In classical theory, plant peels have a special ability to act on the body's surface layer (skin and subcutaneous tissue), making Dōng Guā Pí particularly suited for treating fluid accumulation just beneath the skin.

'Clears Heat and resolves Summer-Heat' refers to the herb's cool nature and its ability to relieve symptoms caused by hot weather, such as intense thirst, scanty dark urine, and general discomfort from the summer heat. It is commonly brewed as a simple tea or combined with watermelon rind (Xī Guā Cuì Yī) for a refreshing summertime drink. This action also extends to clearing mild Heat from the urinary tract, making it useful when urination is both reduced and painful or dark-colored due to Damp-Heat.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Dong Gua Pi is used to help correct these specific patterns.

Why Dong Gua Pi addresses this pattern

When the Spleen fails to properly transform and transport fluids, water accumulates beneath the skin, causing puffiness and heaviness. Dōng Guā Pí enters the Spleen channel and gently promotes urination to drain this accumulated Dampness outward. Its sweet taste supports the Spleen without causing further damage, while its cool nature prevents any Heat from developing as stagnant fluids accumulate. As a plant peel, it has a traditional affinity for the body's surface layer, making it especially suited for the subcutaneous edema typical of this pattern.

A practitioner would look for one or more of these signs

Edema

Facial and limb puffiness, especially in the morning

Difficulty Urinating

Reduced urine output

Abdominal Pain

Abdominal fullness and distension

Eye Fatigue

Heaviness and tiredness in the limbs

Commonly Used For

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

Arises from: Spleen Deficiency with Dampness Damp-Heat in the Lower Burner

TCM Interpretation

In TCM, edema (水肿 shuǐ zhǒng) is understood as a failure of the body's fluid metabolism system. Three organs play key roles: the Lungs distribute fluids downward and outward, the Spleen transforms and transports fluids, and the Kidneys govern water metabolism at the deepest level. When any of these organs becomes weakened or obstructed, fluids accumulate in the tissues rather than being properly circulated and excreted. Depending on whether the edema is above or below the waist, and whether it is accompanied by Heat or Cold signs, different organs and pathogenic factors are prioritized in treatment.

Why Dong Gua Pi Helps

Dōng Guā Pí addresses edema through its gentle but effective diuretic action. Its cool nature and sweet, bland taste allow it to promote urination without harsh side effects, making it safe for long-term or food-based use. Because plant peels in TCM theory have a special affinity for the body's surface layer, Dōng Guā Pí is considered particularly effective for subcutaneous fluid accumulation (the type of edema you can press with a finger and see an indentation). It enters the Spleen channel, directly supporting the organ most responsible for fluid transformation, and the Small Intestine channel, which helps separate useful fluids from waste. Clinical studies on non-renal edema patients showed that taking Dōng Guā Pí decoction significantly increased urine output within the first two hours.

Also commonly used for

Cystitis

Urinary tract discomfort with dark urine

High Blood Pressure

Supportive use for mild fluid-related hypertension

Obesity

Adjunctive support for weight management through fluid drainage

Acute Nephritis

Supportive treatment for kidney inflammation with edema

Herb Properties

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

Temperature

Cool

Taste

Sweet (甘 gān), Bland (淡 dàn)

Channels Entered

Spleen Small Intestine Lungs

Parts Used

Peel / Rind (皮 pí / 果皮 guǒ pí)

Dosage & Preparation

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

Standard dosage

15-30g

Maximum dosage

Up to 60g in acute edema, under practitioner supervision. As a food-grade herb with no toxicity, higher doses are well tolerated but should be guided by clinical need.

Dosage notes

The standard decoction dose is 15-30g. For mild summertime fluid retention or as a daily health tea, the lower end of the range (15g) is appropriate. For more pronounced edema with urinary difficulty, doses toward 30g or slightly above can be used. Dong Gua Pi is most commonly used as a supporting herb in formulas rather than as a principal herb acting alone. When used externally as a wash for skin conditions, an appropriate amount is decocted and the liquid applied to the affected area.

Preparation

No special decoction handling required. Dong Gua Pi is simply added to the decoction pot with other herbs. It should be washed, cut into pieces or wide strips, and dried before use. For external application, it is decocted in water and the liquid used as a wash.

Common Herb Pairs

These ingredients are traditionally combined with Dong Gua Pi for enhanced therapeutic effect

Fu Ling Pi
Fu Ling Pi 1:1 (each 9-15g)

Fú Líng Pí (Poria peel) strengthens the Spleen and drains Dampness from the surface, while Dōng Guā Pí promotes urination and clears mild Heat. Together, they powerfully address subcutaneous edema by combining Spleen-supporting and water-draining actions. Both are plant peels, reinforcing their shared affinity for the body's surface layer where fluid accumulates.

When to use: Generalized edema with puffiness in the face and limbs, reduced urination, and a feeling of heaviness, particularly in the classical Wu Pi San (Five-Peel Powder) pattern.

Da Fu Pi
Da Fu Pi 1:1 (each 9-15g)

Dà Fù Pí (Areca peel) moves Qi downward and relieves abdominal distension, while Dōng Guā Pí drains water and promotes urination. The combination addresses the common pairing of Qi stagnation and fluid retention: when Qi does not move, fluids stagnate, and when fluids accumulate, Qi becomes further obstructed. Together they break this cycle.

When to use: Edema accompanied by significant abdominal bloating and fullness, as seen in the Wu Pi San formula.

Chi Xiao Dou
Chi Xiao Dou Dōng Guā Pí 15-30g : Chì Xiǎo Dòu 30-60g

Chì Xiǎo Dòu (Adzuki bean) clears Heat, promotes urination, and reduces swelling, complementing Dōng Guā Pí's similar but milder actions. Together they enhance the diuretic effect while also nourishing the Spleen, making this a gentle but effective pair for chronic edema.

When to use: Chronic edema due to Spleen deficiency, including pregnancy-related swelling, where strong diuretics are not appropriate.

Di Gu Pi
Di Gu Pi 1:1 (each 15-30g)

Xī Guā Pí (Watermelon rind) strongly clears Summer-Heat and generates fluids, while Dōng Guā Pí promotes urination and drains Dampness. Together they form a classic summertime pairing that both clears Heat from above and drains Dampness from below, addressing thirst, scanty urine, and general malaise from hot weather.

When to use: Summer-Heat patterns with thirst, scanty dark urine, and general discomfort from hot, humid weather. Often used as a simple home tea.

Comparable Ingredients

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

Fu Ling Pi
Dong Gua Pi vs Fu Ling Pi

Both drain Dampness from beneath the skin and reduce edema. However, Fú Líng Pí is neutral in temperature and stronger at strengthening the Spleen, making it better for chronic Spleen-deficiency edema without Heat signs. Dōng Guā Pí is cool and also clears Heat, making it more appropriate when edema is accompanied by Heat signs such as dark urine, thirst, or summer weather.

Ze Xie
Dong Gua Pi vs Ze Xie

Both promote urination and drain Dampness. Zé Xiè is cold and enters the Kidney and Bladder channels, making it much stronger as a diuretic and better for draining deeper accumulations of water. Dōng Guā Pí is milder, acts more on the body's surface layer, and is better suited as a gentle, food-grade supporting herb rather than a primary diuretic.

Yi Yi Ren
Dong Gua Pi vs Yi Yi Ren

Both drain Dampness and are mild enough for food-based use. Yì Yǐ Rén (Coix seed) is slightly cool and also strengthens the Spleen and clears Heat, but it has additional actions of expelling pus and relieving joint pain (Bi syndrome) that Dōng Guā Pí lacks. Dōng Guā Pí is more specifically targeted at subcutaneous edema and urinary difficulty.

Therapeutic Substitutes

Legitimate clinical replacements when Dong Gua Pi is unavailable, restricted, or contraindicated

Zhu Ling

Zhu Ling
Zhu Ling 猪苓
Polyporus mushroom

Covers: Covers Dōng Guā Pí's primary action of promoting urination and draining dampness to reduce edema and relieve urinary difficulty. Like Dōng Guā Pí, Zhū Líng is a dampness-draining herb that increases urine output and addresses fluid accumulation.

Does not cover: Zhū Líng has no meaningful heat-clearing or summer-heat-relieving action, so it cannot replace Dōng Guā Pí in presentations where the chief complaint is summer-heat with thirst and irritability. Zhū Líng is also stronger and more draining in character, making it less appropriate where a mild, food-grade diuretic is preferred. It does not share Dōng Guā Pí's gentle, diet-compatible nature.

Use when: When Dōng Guā Pí is unavailable or of poor quality and the clinical goal is purely to promote urination and reduce water accumulation or edema, without a summer-heat component.

Xi Gua Cui Yi

Covers: Covers Dōng Guā Pí's action of clearing summer-heat and relieving thirst. Xī Guā Cuì Yī (the green outer rind of watermelon, 西瓜翠皮) is sweet and cool, clears summer-heat, generates fluids, and has mild diuretic properties — closely matching Dōng Guā Pí's secondary indication of summer-heat with thirst and scanty urination.

Does not cover: Xī Guā Cuì Yī's diuretic action is milder than Dōng Guā Pí's and it is less suited to pronounced edema or significant fluid accumulation. It is primarily a summer seasonal remedy and is not well-suited to general dampness or chronic water retention patterns outside of summer-heat contexts.

Use when: When the main indication is summer-heat with thirst, mild urinary difficulty, and slight swelling — particularly in warm-season presentations where Dōng Guā Pí is unavailable and a food-grade, heat-clearing substitute is preferred.

Identity & Adulterants

Related species and common adulterations to be aware of when sourcing Dong Gua Pi

Dong Gua Pi is inexpensive and widely available as a food byproduct, so deliberate adulteration is rare. However, it may occasionally be confused with other gourd peels such as watermelon rind (Xi Gua Pi, 西瓜皮), which has a different appearance (greener outer layer with distinct white and red inner layers) and somewhat different properties. Poorly processed or old stock may lack the white waxy coating and have diminished quality. The peel of the smaller variant known as Jie Gua (节瓜, Benincasa hispida var. chieh-qua) may also be substituted; it lacks the white waxy bloom and is smaller in size.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Dong Gua Pi

Non-toxic

Dong Gua Pi is classified as non-toxic. It is the peel of a common food vegetable and has an excellent safety profile. No toxic components have been identified. Classical sources including the Ben Cao Zai Xin explicitly record it as having "no toxicity" (无毒). No special processing is required to render it safe.

Contraindications

Situations where Dong Gua Pi should not be used or requires extra caution

Caution

Spleen and Stomach deficiency cold (脾胃虚寒): Dong Gua Pi is cool in nature and promotes urination. People with constitutional cold in the digestive system, with symptoms like loose stools, poor appetite, or cold limbs, should avoid this herb as it may worsen these symptoms.

Caution

Edema due to malnutrition or deficiency (营养不良虚肿): The Si Chuan Zhong Yao Zhi (Sichuan Materia Medica) specifically warns against using Dong Gua Pi when edema is caused by nutritional deficiency rather than dampness or heat, as the draining action may further deplete the body.

Caution

Yang deficiency with internal cold: Because of its cool, draining nature, Dong Gua Pi should not be used in people who are already depleted in Yang Qi, as it may further damage Yang and impair the body's warming and transforming functions.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Generally considered safe at standard doses during pregnancy. Dong Gua Pi is the peel of a common food vegetable and has no known uterine-stimulating or teratogenic properties. It has historically been used in dietary therapy for pregnancy-related edema (as in winter melon and carp congee recipes). However, because of its cool, diuretic nature, prolonged high-dose use is not advisable in pregnant women with Spleen-Yang deficiency.

Breastfeeding

No specific safety concerns during breastfeeding. Dong Gua Pi is derived from a widely consumed food vegetable and is not known to contain compounds that transfer through breast milk in harmful concentrations. Its gentle, bland nature makes it one of the safer dampness-draining herbs. As with all cooling herbs, extended use at high doses should be avoided in nursing mothers with weak digestion, as this could theoretically reduce milk production by weakening Spleen Qi.

Children

Dong Gua Pi is generally safe for children, being derived from a common food vegetable. Dosage should be reduced proportionally based on the child's age and body weight, typically one-third to one-half the adult dose. Suitable for children over 3 years of age. Because of its cool nature and diuretic effect, it should be used cautiously in children with weak digestion or chronic loose stools.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Dong Gua Pi

No well-documented drug interactions have been reported for Dong Gua Pi specifically. However, given its established diuretic properties, the following theoretical considerations apply:

  • Diuretic medications: Concurrent use with pharmaceutical diuretics (e.g. furosemide, hydrochlorothiazide) could theoretically have an additive effect, potentially increasing fluid and electrolyte loss. Monitoring is advisable.
  • Lithium: As with any substance that increases urinary output, there is a theoretical risk of altering lithium clearance and blood levels in patients taking lithium.
  • Antihypertensive drugs: The diuretic effect may contribute to a mild additive blood-pressure-lowering effect when combined with antihypertensive medications.

These are theoretical considerations based on pharmacological class effects, not documented clinical interactions.

Dietary Advice

Foods and dietary considerations when taking Dong Gua Pi

When taking Dong Gua Pi for edema or dampness conditions, it is helpful to reduce intake of salty, greasy, and heavily processed foods, as these can worsen fluid retention. Cold and raw foods should be limited if the person has weak digestion, since Dong Gua Pi is already cooling in nature and adding more cold foods may burden the Spleen. Pairing it with mild, warm, and easily digestible foods like rice congee can help balance its cool properties. In summer, it pairs well with other cooling foods like mung bean or watermelon rind for clearing heat.

Botanical Description

Physical characteristics and morphology of the Dong Gua Pi source plant

Benincasa hispida (Thunb.) Cogn. is an annual climbing or trailing vine belonging to the Cucurbitaceae (gourd) family and the sole species in the genus Benincasa. The stems are covered with yellowish-brown stiff hairs and soft hairs, climbing by means of branched tendrils (2-3 forked). The leaves are kidney-shaped to nearly round, palmately 5-lobed, 15-30 cm in diameter, with stout hairy petioles.

The plant is monoecious (bearing both male and female flowers on the same vine), producing large yellow flowers in summer. The fruit is cylindrical or nearly globular, sometimes reaching 60-80 cm in length, with a thick white flesh. When mature, the fruit's outer surface develops a distinctive waxy white powdery coating (white bloom), which is the origin of the name "white gourd" (白瓜). The seeds are round, flat, with swollen margins.

The medicinal product Dong Gua Pi is the dried outer peel of this mature fruit, peeled off when the winter melon is consumed, then sun-dried for use.

Sourcing & Harvesting

Where Dong Gua Pi is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Summer to autumn, when the fruit is fully mature and covered in its characteristic white waxy bloom. The peel is collected as a byproduct when the fruit is eaten.

Primary growing regions

Winter melon (Benincasa hispida) is cultivated throughout China and across tropical, subtropical, and temperate regions of Asia. There is no single famous "terroir" (道地药材) region for Dong Gua Pi, as the plant is widely and commonly grown. Major producing areas include Guangdong, Guangxi, Sichuan, Hubei, Hunan, Jiangxi, and Zhejiang provinces. Wild specimens still occur in Xishuangbanna, Yunnan. Because Dong Gua Pi is a byproduct of an extremely common food crop, it is readily available from virtually all regions of China.

Quality indicators

Good quality Dong Gua Pi consists of thin, irregular curling fragments. The outer surface should be grayish-green or yellowish-white, ideally still covered with the characteristic white waxy bloom (白霜). The inner surface is rougher, and vascular bundle strands may be visible. The pieces should be light, crisp, and dry. The smell is faint and the taste bland. Avoid pieces that are overly dark, moldy, or lacking the white frosted coating, as the bloom indicates proper maturity of the source fruit.

Classical Texts

Key passages from the classical Chinese medical texts that describe Dong Gua Pi and its therapeutic uses

《开宝本草》 Kai Bao Ben Cao (Materia Medica of the Kaibao Period, c. 974 AD)

The earliest classical text to record Dong Gua Pi as a separate medicinal substance, noting its sweet, slightly cold nature and its ability to remove lower abdominal water distension, promote urination, and quench thirst.

《滇南本草》 Dian Nan Ben Cao

Original: 「止渴，消痰，利小便。治中风。」

Translation: "Stops thirst, resolves phlegm, promotes urination. Treats wind-stroke."

《本草纲目》 Ben Cao Gang Mu

Original: 「主驴马汗入疮肿痛，阴干为末涂之，又主折伤损痛。」

Translation: "Mainly treats sores with swelling and pain caused by animal sweat entering wounds; dry in shade, grind to powder, and apply topically. Also treats pain from traumatic injuries."

《本草再新》 Ben Cao Zai Xin

Original: 「走皮肤，去湿追风，补脾泻火。」

Translation: "Reaches the skin, dispels dampness and expels wind, supplements the Spleen and drains fire."

《本草图经》 Ben Cao Tu Jing

Original: 「功用与冬瓜等。」

Translation: "Its actions are the same as winter melon [flesh]."

Historical Context

The history and evolution of Dong Gua Pi's use in Chinese medicine over the centuries

Winter melon is one of the oldest cultivated gourds in China, with records in the Shen Nong Ben Cao Jing (Divine Farmer's Classic of Materia Medica) dating to the Han dynasty, where it appears under the names "water fungus" (水芝) and "white gourd" (白瓜). The name "winter melon" (冬瓜) does not mean it grows in winter. Rather, when the fruit ripens, its surface develops a white waxy powder resembling winter frost, hence the name. Another explanation holds that the intact fruit can be stored all the way through winter without spoiling.

While the whole fruit has been used medicinally since antiquity, the peel (Dong Gua Pi) was first recorded as a distinct medicinal substance in the Kai Bao Ben Cao (开宝本草), compiled around 974 AD during the Song dynasty. The Ben Cao Gang Mu (1596) further expanded its indications to include topical use for traumatic injuries. Li Shizhen recorded that the peel, when dried, powdered, and taken with wine, could treat lumbar strain and traumatic pain. An interesting classical recipe from the Zhai Xuan Fang uses Dong Gua Pi combined with perilla root and ginger peel as an external wash to treat generalized swelling. In TCM practice, Dong Gua Pi became a valued herb in the category of "dampness-draining" medicines, prized for its gentle, food-grade safety and specific affinity for resolving skin-level edema.

Modern Research

3 published studies investigating the pharmacological effects or clinical outcomes of Dong Gua Pi

1

Literature-Based Review on Traditional Uses, Nutraceutical, and Phytopharmacological Profiles of Benincasa hispida (2021)

Al-Snafi AE et al., Oxid Med Cell Longev, 2021, 2021, 6628659

A comprehensive literature review covering the ethnopharmacological, phytochemical, and pharmacological properties of Benincasa hispida. The review documented multiple preclinical activities including diuretic, anti-inflammatory, antioxidant, anxiolytic, antidiabetic, and nephroprotective effects, supporting many of the traditional medicinal uses of winter melon and its peel.

PubMed
2

Antioxidant and Anti-Aging Activities of Benincasa hispida Peel Extracts with Molecular Docking (In Vitro, 2023)

Phumat P, Chaichit S, Potprommanee S, et al., Foods, 2023, 12(19), 3555

This laboratory study examined different extracts of Benincasa hispida peel and found high flavonoid and phenolic content, particularly in the ethanol extract, which showed significant antioxidant activity and inhibitory effects against collagenase and hyaluronidase enzymes (relevant to skin aging). All extracts were found to be non-toxic to fibroblast cells, supporting the safety of the peel.

Link
3

Pharmacological Update on Benincasa hispida (Thunb.): A Review (2024)

Singh S, Gohil KJ, Singh MP, Pharmacological Research - Modern Chinese Medicine, 2024, 12, 100478

An updated pharmacological review detailing the wide range of bioactivities reported for Benincasa hispida, including antioxidant, anti-cancer, antiviral, anti-inflammatory, analgesic, diuretic, and central nervous system effects. The review noted the plant's rich phytochemistry including triterpenes, flavonoids, sterols, and volatile compounds in the peel.

Link

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.