Herb Bark (皮 pí / 树皮 shù pí)

Sheng Jiang Pi

Ginger peel · 生姜皮

Zingiber officinale Rosc. · Exocarpium Zingiberis Recens

Also known as: Jiāng Pí (姜皮), Shēng Jiāng Yī (生姜衣), Ginger skin,

Sheng Jiang Pi (Ginger peel) plant

Images shown are for educational purposes only

Sheng Jiang Pi is the outer peel of fresh ginger, used specifically to reduce water retention and swelling. Unlike the ginger flesh, which is warming, the peel is cool in nature and works by promoting urination and moving water that has accumulated under the skin. It is most commonly used for mild, early-stage puffiness and bloating, especially in the face and limbs.

Category Dampness-draining herbs (利水渗湿药)
Therapeutic focus Fluid Retention and Edema Urinary Health Digestive Health

TCM Properties

Temperature

Cool

Taste

Acrid / Pungent (辛 xīn)

Channels entered

Spleen, Lungs

Parts used

Bark (皮 pí / 树皮 shù pí)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Herb Does

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

Therapeutic focus

In practical terms, Sheng Jiang Pi is primarily used to support these areas of health:

Fluid Retention and Edema Urinary Health Digestive Health

TCM Actions

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

Promotes Urination and Reduces Edema Harmonizes the Spleen and Stomach

How these actions work

'Promotes urination and reduces edema' is the primary and defining action of Sheng Jiang Pi. In TCM, when the Spleen fails to properly transform and transport fluids, water can accumulate under the skin, causing puffiness and swelling (a condition classically called 'skin water' or pí shuǐ 皮水). Sheng Jiang Pi has a special affinity for moving water that is trapped in the surface layer of the body and the spaces between the skin and muscles. This is based on the classical principle of 'using peel to treat the peel' (yǐ pí dá pí 以皮达皮), meaning that the outer bark of a plant naturally acts on the outer layers of the body. Its pungent taste gives it a dispersing quality, helping to push stagnant water outward through urination. It is used for early-stage water retention, puffy swollen face and limbs, and reduced urinary output.

'Harmonizes the Spleen' refers to its gentle ability to support Spleen function without strongly warming or drying. The Spleen is responsible for fluid metabolism in TCM, and when it becomes sluggish, dampness and water accumulate. Sheng Jiang Pi gently assists the Spleen's water-moving function. Importantly, unlike the ginger flesh (Sheng Jiang) which is warm and used for colds, nausea, and warming the stomach, Sheng Jiang Pi is cool in nature. This means it can be used even in people with some heat or in situations where a warming herb would be inappropriate. The classical saying 'keeping the ginger peel makes it cooling, removing the peel makes it hot' (liú jiāng pí zé liáng, qù jiāng pí zé rè) captures this important distinction.

Patterns Addressed

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

Why Sheng Jiang Pi addresses this pattern

When the Spleen is weak and fails to transform and transport body fluids properly, dampness accumulates and spills outward into the skin and limbs, causing generalized puffiness and water retention. This is classically described as 'skin water' (pí shuǐ). Sheng Jiang Pi enters the Spleen and Lung channels, gently supporting the Spleen's fluid-moving function while its pungent, dispersing nature drives stagnant water out through the skin and urinary system. Its cool temperature means it does not add unwanted heat the way most Spleen-supportive herbs do. Its unique 'peel-to-peel' tropism makes it especially effective for water trapped in the superficial tissues.

A practitioner would look for one or more of these signs

Edema

Generalized puffiness, especially of the face and limbs

Abdominal Pain

Fullness and distension in the abdomen

Reduced Urine Output

Decreased urination accompanying the water retention

Heavy Sensation In The Head

Body feels heavy and waterlogged

Commonly Used For

These are conditions where Sheng Jiang 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 Water Overflowing the Skin

TCM Interpretation

TCM understands edema as a failure of the body's fluid-managing system, primarily involving three organs: the Lung, which regulates the water passages; the Spleen, which transforms and transports fluids; and the Kidney, which governs water metabolism at its deepest level. When the Spleen becomes weak (from poor diet, overwork, or constitutional tendency), it can no longer move fluids efficiently. Water accumulates and overflows into the skin and limbs. The classical term for superficial swelling is 'skin water' (pí shuǐ). If the Lung also fails to regulate the descending of fluids, water can accumulate in the upper body and face as well.

Why Sheng Jiang Pi Helps

Sheng Jiang Pi addresses edema through its specific affinity for the body's surface layer. As a peel or bark, it follows the classical principle of 'using peel to treat peel,' meaning it targets water trapped in the skin and subcutaneous tissues. Its pungent taste disperses stagnant fluid, and its cool nature prevents it from generating further heat. It enters the Spleen and Lung channels, supporting the two organs most responsible for moving water in the upper and middle body. While Sheng Jiang Pi is not powerful enough to treat severe edema on its own, it is a key component of formulas like Wu Pi San (Five-Peel Powder), where it works alongside other peel herbs to gently but effectively resolve water retention.

Also commonly used for

Water Retention

General fluid retention in the skin and limbs

Ascites

Used as part of larger formulas for abdominal fluid accumulation

Urticaria

Chronic hives, as part of multi-skin-peel formulas

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

Acrid / Pungent (辛 xīn)

Channels Entered

Spleen Lungs

Parts Used

Bark (皮 pí / 树皮 shù pí)

Dosage & Preparation

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

Standard dosage

2-6g

Maximum dosage

Up to 9g in cases of significant edema, under practitioner supervision. This herb is mild and low-dose by nature; exceeding standard doses is rarely necessary.

Dosage notes

Use the standard range of 2-6g for mild skin-level edema and to promote urination. When combined with other diuretic peels (as in Wu Pi Yin), equal portions of each herb at around 9g each are traditional. Since ginger peel is cool and the ginger flesh is warm, the classical teaching is: keep the peel on when you want a cooling, water-moving effect; remove the peel when you want warming and exterior-releasing actions.

Preparation

No special decoction handling required. Sheng Jiang Pi is added to the decoction pot with other herbs and decocted normally. In classical texts, it is sometimes ground into powder (屑末) and taken with wine for wind-stroke conditions.

Common Herb Pairs

These ingredients are traditionally combined with Sheng Jiang Pi for enhanced therapeutic effect

Fu Ling Pi
Fu Ling Pi 1:1 (equal parts, typically 6-9g each)

Both herbs specialize in draining water from the skin and superficial tissues. Fu Ling Pi (poria peel) promotes bland-flavored seepage of water downward through urination, while Sheng Jiang Pi uses its pungent dispersing action to push water outward. Together they address water retention from two directions: inward-draining and outward-dispersing.

When to use: Skin-level edema with puffiness of the face and limbs, scanty urination, and a feeling of heaviness. This is the core pairing within Wu Pi San.

Da Fu Pi
Da Fu Pi 1:1 (equal parts, typically 6-9g each)

Da Fu Pi (areca husk) descends Qi and moves water downward, reducing abdominal distension. Sheng Jiang Pi disperses water from the skin. Together they address both the bloating and the surface puffiness that often accompany Spleen-dampness water retention.

When to use: Edema accompanied by abdominal fullness, distension, and a sense of tightness in the chest and belly.

Sang Bai Pi
Sang Bai Pi 1:1 to 1:1.5 (Sheng Jiang Pi 6g : Sang Bai Pi 6-9g)

Sang Bai Pi (mulberry root bark) descends Lung Qi and opens the water passages from above, while Sheng Jiang Pi works at the skin level to disperse superficial water. Together they address the Lung's role in fluid regulation alongside the Spleen's, creating a top-down drainage of water retention.

When to use: Edema with upper body involvement (puffy face), shortness of breath or slight wheezing, and reduced urination.

Dong Gua Pi
Dong Gua Pi 1:2 (Sheng Jiang Pi 6g : Dong Gua Pi 12-15g)

Dong Gua Pi (winter melon peel) clears heat and promotes urination, complementing Sheng Jiang Pi's pungent dispersing action. Both are peels with surface-level water-moving ability. The combination is especially suited for water retention where there is some mild heat, since both herbs are cooling.

When to use: Summer edema, water retention with slight heat signs, or puffy swelling with warm skin.

Key Formulas

These well-known formulas feature Sheng Jiang Pi in a prominent role

Wu Pi Yin 五皮飲 Assistant

Wu Pi Yin (Five-Peel Decoction) from the Tai Ping Hui Min He Ji Ju Fang is a closely related variant that substitutes Wu Jia Pi and Di Gu Pi for some ingredients. Sheng Jiang Pi again contributes its surface-level water dispersal, demonstrating its consistent role across the classical peel-formula family for treating edema, abdominal distension, and shortness of breath.

Comparable Ingredients

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

Sheng Jiang
Sheng Jiang Pi vs Sheng Jiang

Both come from the same plant (fresh ginger), but their properties are opposite in key ways. Sheng Jiang (the flesh) is warm, releases the exterior, warms the stomach, and stops vomiting. Sheng Jiang Pi (the peel) is cool, promotes urination, and reduces edema. Sheng Jiang warms; Sheng Jiang Pi cools. When cooking with ginger for general balance, the peel is traditionally left on. When treating cold conditions or nausea, the peel is removed. When targeting water retention, only the peel is used.

Fu Ling Pi
Sheng Jiang Pi vs Fu Ling Pi

Both drain water from the skin level, and they are frequently paired together. Fu Ling Pi is bland and neutral, working through gentle seepage, and also mildly supports the Spleen. Sheng Jiang Pi is pungent and cool, working through active dispersal of water. Fu Ling Pi is the stronger diuretic of the two, while Sheng Jiang Pi has more surface-dispersing action. For pure water retention, Fu Ling Pi is the primary choice; Sheng Jiang Pi adds the pungent scattering element.

Dong Gua Pi
Sheng Jiang Pi vs Dong Gua Pi

Both are cooling peels that promote urination and reduce edema. Dong Gua Pi (winter melon peel) is stronger at clearing heat and is used in higher doses, making it more suitable for heat-type edema or summer dampness. Sheng Jiang Pi is milder and has a special harmonizing effect on the Spleen. Dong Gua Pi is preferred when heat is prominent; Sheng Jiang Pi when Spleen harmonization is also needed.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Sheng Jiang Pi

Because Sheng Jiang Pi is simply the outer peel of common culinary ginger (Zingiber officinale), adulteration is rare. However, the peel should be distinguished from the whole fresh ginger rhizome (Sheng Jiang) and dried ginger (Gan Jiang), which have very different thermal natures and therapeutic actions. Sheng Jiang Pi is cool and promotes diuresis, while Sheng Jiang flesh is warm and releases the exterior, and Gan Jiang is hot and warms the interior. The peels of other Zingiberaceae species such as galangal (Gao Liang Jiang) could theoretically be confused with ginger peel, but their aroma and flavor profiles differ noticeably.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Sheng Jiang Pi

Non-toxic

Sheng Jiang Pi is classified as non-toxic and has no known toxic components at standard dosages. It is the thin outer peel of common culinary ginger, which has an extensive history of safe food and medicinal use. Trace amounts of safrole (黄樟素) have been detected in ginger, but research by the Sichuan Academy of Agricultural Sciences found levels far below safety thresholds. No special processing is required to render it safe.

Contraindications

Situations where Sheng Jiang Pi should not be used or requires extra caution

Caution

Spleen and Stomach deficiency Cold (脾胃虚寒): Sheng Jiang Pi is cool in nature and can aggravate cold patterns in the digestive system, potentially worsening symptoms like loose stools, abdominal pain, and poor appetite in those with underlying Spleen-Stomach Cold.

Caution

Wind-Cold exterior patterns requiring sweating therapy: Sheng Jiang Pi has a mild astringent effect on sweating (the classical text Yi Lin Zuan Yao notes that while ginger promotes sweating, its peel restrains it). It should not be used when the treatment goal is to release the exterior through sweating.

Caution

Edema due to Kidney Yang deficiency with severe Cold signs: Sheng Jiang Pi's cool nature and mild diuretic action are insufficient and potentially counterproductive for edema rooted in deep Kidney Yang collapse, where strong warming and Yang-restoring herbs are needed.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Sheng Jiang Pi is generally considered safe during pregnancy at standard doses. In fact, it is a component of Wu Pi Yin (Five-Peel Drink), which has classical indications for pregnancy-related edema. However, the ginger plant as a whole contains gingerol compounds that may stimulate uterine contractions in high doses. Pregnant women should use Sheng Jiang Pi only at standard dosages (2-6g) and under practitioner guidance.

Breastfeeding

Sheng Jiang Pi is generally regarded as safe during breastfeeding at standard doses (2-6g). Ginger is widely used as a culinary ingredient and has a long history of safe use by nursing mothers. No adverse effects on lactation or breast milk quality have been reported. However, excessive use of any pungent herb could theoretically affect the flavor of breast milk, so standard doses are recommended.

Children

Sheng Jiang Pi may be used in children at reduced doses proportional to age and body weight, typically one-third to one-half of the adult dose. It is mild and non-toxic. For young children under 3 years, use with caution and only under practitioner guidance, as the cool nature may be too dispersing for immature digestive systems.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Sheng Jiang Pi

No drug interactions have been specifically studied for Sheng Jiang Pi (ginger peel) in isolation. However, since it shares bioactive compounds with whole ginger (Zingiber officinale), the following interactions documented for ginger may apply:

  • Anticoagulant and antiplatelet drugs (e.g. warfarin, aspirin): Ginger has mild antiplatelet activity and could theoretically enhance bleeding risk when combined with blood-thinning medications.
  • Hypoglycemic agents (e.g. metformin, insulin): Ginger has been shown to lower fasting blood glucose, so concurrent use could potentiate blood sugar lowering effects.

These interactions are more relevant to higher doses of whole ginger; at the low doses used for Sheng Jiang Pi (2-6g), clinically significant interactions are unlikely but should still be monitored.

Dietary Advice

Foods and dietary considerations when taking Sheng Jiang Pi

Avoid excessive consumption of cold, raw, or icy foods and drinks while using Sheng Jiang Pi for edema, as these can impair the Spleen's water-processing function and counteract the herb's diuretic effect. Reducing salt intake is also advisable when treating fluid retention. Light, easily digestible foods that support Spleen function (such as rice congee, cooked root vegetables, and mild soups) are helpful.

Botanical Description

Physical characteristics and morphology of the Sheng Jiang Pi source plant

Sheng Jiang Pi is the outer bark (cork layer) of the rhizome of Zingiber officinale Rosc., a member of the Zingiberaceae (ginger) family. The ginger plant is a perennial herb growing 50–100 cm tall, with thick, fleshy, aromatic rhizomes that branch irregularly. The leaves are lance-shaped, arranged alternately in two rows, 15–30 cm long and about 2–2.5 cm wide, with a smooth surface and no stalks. In autumn, the plant produces yellowish-green flowers in a dense, oval spike rising from the rhizome on a stalk up to 25 cm long. The flowers have purple stamens and a lip petal with purple stripes and pale yellow spots.

The medicinal material is the thin outer peel scraped from the fresh rhizome after autumn harvest. When dried, it appears as curled, irregular greyish-yellow fragments with fine wrinkles and a characteristic spicy, aromatic smell.

Sourcing & Harvesting

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

Harvesting season

Autumn, when mature ginger rhizomes are dug up. The outer cork layer is scraped off with a bamboo knife and sun-dried.

Primary growing regions

Ginger is widely cultivated across central, southeastern, and southwestern China. The primary producing regions (道地药材) for high-quality ginger include Sichuan, Guizhou, Hubei, Guangdong, and Guangxi provinces. Shandong Province (particularly Laiwu and Changyi) is also a major production area, known for large rhizomes with thin skin. Since ginger peel is simply the outer bark of fresh ginger rhizomes, its sourcing follows that of Sheng Jiang (fresh ginger).

Quality indicators

Good quality Sheng Jiang Pi consists of curled, greyish-yellow fragments of uniform thin bark. The inner surface should show visible yellowish oil dots (indicating aromatic oil content). The texture should be soft and pliable, not brittle or overly dry. It should have a strong, distinctive spicy-aromatic ginger smell and a pungent taste. Avoid pieces that are darkened, moldy, or lacking in aroma, as these indicate deterioration or poor storage.

Classical Texts

Key passages from the classical Chinese medical texts that describe Sheng Jiang Pi and its therapeutic uses

《医林纂要·药性》(Yī Lín Zuǎn Yào)

Original: 姜皮辛寒，凡皮，多反本性，故寒。以皮达皮，辛则能行，故治水浮肿，去皮肤之风热。姜发汗，则姜皮止汗，且微寒也。

Translation: Ginger peel is pungent and cold. In general, the peel of a plant tends to have the opposite nature of its flesh, hence it is cold. Using peel to reach the skin layer — since pungency can promote movement — it therefore treats water-type swelling and dispels wind-heat from the skin. Ginger [flesh] promotes sweating, while ginger peel restrains sweating, being slightly cold in nature.

《食疗本草》(Shí Liáo Běn Cǎo)

Original: 治偏风：生姜皮，作屑末，和酒服。

Translation: For wind-stroke affecting one side of the body: grind ginger peel into powder and take with wine.

《江苏植药志》(Jiāngsū Zhí Yào Zhì)

Original: 外用于脓肿创伤，皮肤癣症。

Translation: Used externally for abscesses, wounds, and skin fungal infections.

Historical Context

The history and evolution of Sheng Jiang Pi's use in Chinese medicine over the centuries

Sheng Jiang Pi first appears as a distinct medicinal substance in the Ben Cao Tu Jing (本草图经) of the Song dynasty. While ginger itself has been used medicinally since the time of the Shen Nong Ben Cao Jing, the peel was recognized separately for its unique cool nature, which runs opposite to the warming flesh. This principle is captured in the classical saying attributed to the Jin-Yuan physician Zhu Danxi: "留姜皮则凉，去姜皮则热" — keeping the ginger peel makes a preparation cooling, while removing it makes it warming.

The most famous application of Sheng Jiang Pi is in the formula Wu Pi Yin (五皮饮, Five-Peel Drink), attributed to the Hua Shi Zhong Zang Jing, where five different peels are combined to treat skin-level edema. The Yi Lin Zuan Yao provides the key theoretical explanation: "以皮达皮" (using peel to reach the skin), reflecting the TCM principle that the outer layer of a plant has a natural affinity for the outer layer of the body. This elegant concept of treating the body's surface with the plant's surface is a hallmark of Chinese medical thinking about herb selection.

Modern Research

3 published studies investigating the pharmacological effects or clinical outcomes of Sheng Jiang Pi

1

Pharmacological properties of ginger (Zingiber officinale): what do meta-analyses say? A systematic review (2025)

Paudel KR, Orent J, Penela OG. Frontiers in Pharmacology, 2025, 16:1619655.

This systematic review of meta-analyses published between 2010 and 2025 found that ginger supplementation was associated with significant reductions in inflammatory markers (CRP, TNF-alpha), improved blood sugar control in type 2 diabetes (lower HbA1c and fasting glucose), enhanced antioxidant capacity, and alleviation of pregnancy-related nausea. Note: this research is on whole ginger, not specifically on ginger peel alone.

DOI
2

Therapeutic health effects of ginger (Zingiber officinale): updated narrative review exploring the mechanisms of action (2023)

Crichton M, Marshall S, Marx W, Isenring E, Lohning A. Nutrition Reviews, 2023, 81(9):1213-1224.

This narrative review examined the proposed mechanisms behind ginger's health effects, including its anti-inflammatory, analgesic, and gastrointestinal benefits. It drew on preclinical data to describe how gingerols and shogaols modulate inflammatory pathways. The review notes that clinical translation requires further investigation. These findings pertain to whole ginger rather than isolated peel.

DOI
3

A critical review of ginger's antioxidant, anti-inflammatory, and immunomodulatory activities (2024)

Frontiers in Nutrition, 2024, 11:1435886.

This review identified gingerol, shogaol, paradol, and zingerone as the key bioactive compounds responsible for ginger's antioxidant effects (via Nrf2 signaling) and anti-inflammatory activity (via NF-kB pathway inhibition and reduced pro-inflammatory cytokines). The authors note ginger's potential as an immunomodulator. Research is on whole ginger, not peel specifically.

PubMed

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.