Herb Bark (皮 pí / 树皮 shù pí)

Fu Ling Pi

Poria peel · 茯苓皮

Poria cocos (Schw.) Wolf · Cortex Poriae Cocos

Also known as: Líng Pí (苓皮), Yún Líng Pí (云苓皮), Poria skin,

Fu Ling Pi (Poria peel) plant

Images shown are for educational purposes only

Fu Ling Pi is the dark outer skin of the Poria mushroom, a common medicinal fungus in Chinese medicine. It specializes in reducing puffiness and swelling by gently helping the body drain excess water through urination, without depleting the body's resources. It is most often used for generalized edema and fluid retention that shows up as swelling in the face, limbs, and body surface.

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

TCM Properties

Temperature

Neutral

Taste

Sweet (甘 gān), Bland (淡 dàn)

Channels entered

Lungs, Spleen, Kidneys

Parts used

Bark (皮 pí / 树皮 shù pí)

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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 Fu Ling Pi does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Fu Ling Pi is primarily used to support these areas of health:

Fluid Retention and Edema Urinary Health Digestive Health Skin Heat and Toxic Swellings

TCM Actions

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

Promotes Urination and Reduces Edema Drains Water from the Skin and Flesh Opens the Water Pathways

How these actions work

'Promotes urination and reduces edema' is the primary action of Fu Ling Pi. It helps the body move excess fluid out through the urinary system, addressing puffiness and swelling, particularly when water accumulates beneath the skin surface. Unlike many diuretic herbs, Fu Ling Pi drains water without depleting the body's Qi, making it a gentle yet effective choice for fluid retention. As the classical text Zhongguo Yixue Da Cidian noted, it 'moves water without consuming Qi, surpassing Da Fu Pi (Areca husk).'

'Drains Dampness from the skin and muscles' reflects the classical principle of 'using the skin to treat the skin' (以皮行皮). Because Fu Ling Pi is the outer layer of the Poria fungus, it has a special affinity for fluid that has overflowed into the body's surface tissues and limbs. This makes it particularly suited for generalized skin-level edema where the whole body appears puffy and the limbs feel heavy.

'Opens the water pathways' means Fu Ling Pi helps restore the normal circulation and excretion of body fluids. When the Spleen fails to properly transport and transform fluids, water accumulates in the tissues. Fu Ling Pi gently reopens these fluid routes, especially at the superficial level, helping the Lungs' function of regulating the water passages and the Kidneys' function of excreting urine.

Patterns Addressed

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

Why Fu Ling Pi addresses this pattern

When the Spleen's ability to transform and transport fluids is weakened, Dampness accumulates and overflows into the skin and muscles, causing generalized edema. Fu Ling Pi's sweet, bland, and neutral nature gently drains this surface-level water accumulation through the Lung and Kidney channels without further injuring already-weakened Spleen Qi. Its affinity for the skin layer makes it especially suited when Dampness manifests as puffiness in the face, limbs, and body surface rather than deep organ-level fluid retention.

A practitioner would look for one or more of these signs

Edema

Generalized body puffiness, especially in the face and limbs

Abdominal Pain

Feeling of fullness and distension in the abdomen

Frequent Urination

Scanty urination despite fluid intake

Weak Limbs

Limbs feeling heavy and waterlogged

Commonly Used For

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

Arises from: Water Overflowing the Skin Spleen Deficiency with Dampness

TCM Interpretation

TCM views edema as a disorder of the body's water metabolism, governed primarily by three organ systems: the Lungs (which regulate the downward flow of fluids from above), the Spleen (which transforms and transports fluids in the middle), and the Kidneys (which control water excretion at the bottom). When any of these fail, fluids accumulate in the tissues. Surface-level edema, where the whole body appears swollen and puffy, is often attributed to the Spleen's failure to properly move fluids, allowing water to overflow into the skin and muscles. This is the classical 'skin water' (皮水) pattern.

Why Fu Ling Pi Helps

Fu Ling Pi specifically targets fluid trapped at the body's surface. As the outer skin of the Poria fungus, it follows the classical principle of 'using the skin to treat the skin' (以皮行皮), meaning it has a natural affinity for the superficial tissue layers where edema fluid accumulates. It enters the Lung, Spleen, and Kidney channels, addressing all three organ systems that regulate water movement. Its bland taste gives it a gentle 'seeping' quality that percolates Dampness downward and out through urination, without being harsh or drying. Crucially, unlike many diuretics, Fu Ling Pi drains water without depleting the body's Qi, making it safe for patients who are already debilitated.

Also commonly used for

Frequent Urination

Scanty or difficult urination associated with fluid retention

Abdominal Pain

Bloating and distension due to fluid accumulation

Ascites

Abdominal fluid accumulation, used as part of complex 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

Neutral

Taste

Sweet (甘 gān), Bland (淡 dàn)

Channels Entered

Lungs Spleen Kidneys

Parts Used

Bark (皮 pí / 树皮 shù pí)

Dosage & Preparation

These are general dosage guidelines for Fu Ling 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 30g in standard decoction. Higher doses are rarely needed as Fu Ling Pi is used specifically for its surface-water-draining action, and larger amounts do not add proportional benefit.

Dosage notes

Fu Ling Pi is used at the higher end of the range (15-30g) compared to the main body of Poria (Fu Ling, typically 10-15g), because its action is more focused on moving surface water and its texture is lighter. Some classical sources cite a lower range of 15-30g, while the Zhong Hua Ben Cao lists 3-5g for concentrated preparations. When used in Wu Pi San (Five-Peel Powder) or similar formulas targeting skin-level oedema, the full 15-30g dose is typical. As noted in classical texts, Fu Ling Pi moves water without draining Qi, so it can be used more generously than other diuretics in patients who are already Qi-deficient.

Preparation

Fu Ling Pi has a light, spongy texture and does not require special decoction handling. It can be added to the decoction at the normal time with other herbs. Because the pieces are relatively light and float, some practitioners wrap them loosely in cloth (包煎) to prevent them from floating on the surface and to ensure even extraction.

Common Herb Pairs

These ingredients are traditionally combined with Fu Ling Pi for enhanced therapeutic effect

Da Fu Pi
Da Fu Pi 1:1 (equal parts, typically 9-15g each)

Fu Ling Pi drains Dampness from the skin surface through urination, while Da Fu Pi (Areca husk) moves Qi downward and reduces abdominal distension. Together they address both the fluid stagnation and the Qi stagnation that accompany edema, following the principle that 'when Qi moves, water moves.' Both are 'skin' herbs, enhancing their combined affinity for the body's surface layer.

When to use: Generalized edema with abdominal bloating and distension, as seen in the classical Wu Pi San (Five Peel Powder).

Sheng Jiang Pi
Sheng Jiang Pi 1:1 (equal parts, typically 9-15g each)

Sheng Jiang Pi (fresh ginger peel) warms and disperses water at the skin level while harmonizing the Spleen. Fu Ling Pi provides bland, percolating diuresis. Together they address surface edema from both directions: Sheng Jiang Pi pushes outward while Fu Ling Pi drains downward, and both specifically target the skin layer.

When to use: Skin-level edema with a sensation of cold or heaviness, especially when digestive function is also sluggish. Both herbs appear together in Wu Pi San.

Sang Bai Pi
Sang Bai Pi 1:1 (equal parts, typically 9-15g each)

Sang Bai Pi (Mulberry root bark) descends Lung Qi and opens the water passages from above, while Fu Ling Pi drains Dampness downward through the Kidney and Bladder channels. Together they create a top-to-bottom water-moving pathway: the Lungs regulate the downward flow and the Kidneys excrete it. This pairing treats edema by addressing the Lung's role in fluid distribution.

When to use: Edema accompanied by chest tightness, shortness of breath, or cough due to fluid pressing upward. Classic pairing in Wu Pi San.

Jiao Mu
Jiao Mu Flexible (no fixed ratio, amounts adjusted to case)

Jiao Mu (Sichuan pepper seeds) warms and moves water, particularly in the lower abdomen, while Fu Ling Pi drains surface-level fluid. Together they address edema from both the surface and the interior, with Jiao Mu's warming nature complementing Fu Ling Pi's neutral quality in cases where cold impairs fluid metabolism.

When to use: Edema where cold is a factor, with reduced urination and a cold, heavy sensation in the body. This pairing comes from the classical formula in Jing Yan Liang Fang (Empirically Tested Good Formulas).

Key Formulas

These well-known formulas feature Fu Ling Pi in a prominent role

Wu Pi Yin 五皮飲 King

Wu Pi Yin (Five Peel Decoction) is a closely related variant of Wu Pi San recorded in the San Yin Ji Yi Bing Zheng Fang Lun (Treatise on the Three Categories of Pathogenic Factors). Fu Ling Pi again serves as King, demonstrating how this herb anchors the water-draining strategy in formulas targeting generalized edema with limb heaviness and abdominal distension.

Comparable Ingredients

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

Fu Ling
Fu Ling Pi vs Fu Ling

Fu Ling (the inner white body of Poria) and Fu Ling Pi (the outer skin) come from the same fungus but have distinct clinical niches. Fu Ling has broader actions: it drains Dampness, strengthens the Spleen, and calms the spirit. Fu Ling Pi's action is narrower and more specialized: it focuses specifically on draining water from the skin and muscle layers, making it the better choice for surface-level edema. When edema is the main concern (rather than digestive weakness or anxiety), Fu Ling Pi is preferred. Modern research confirms that Fu Ling Pi contains higher concentrations of the triterpene compounds responsible for diuretic action.

Da Fu Pi
Fu Ling Pi vs Da Fu Pi

Both Fu Ling Pi and Da Fu Pi (Areca husk) are 'peel' herbs used for edema, but they work through different mechanisms. Fu Ling Pi promotes urination to drain water and does so gently without consuming Qi. Da Fu Pi primarily moves Qi downward and reduces abdominal distension, with a secondary water-draining effect. The classical saying notes that Fu Ling Pi 'moves water without consuming Qi, surpassing Da Fu Pi.' For edema with prominent Qi stagnation and bloating, Da Fu Pi is more appropriate; for edema where preserving the patient's Qi is a priority, Fu Ling Pi is preferable.

Zhu Ling
Fu Ling Pi vs Zhu Ling

Both Fu Ling Pi and Zhu Ling (Polyporus) drain Dampness and promote urination. However, Zhu Ling is a stronger diuretic with a slightly cool nature, better suited when there is Dampness with Heat. Fu Ling Pi is neutral and gentler, with a specific tropism for the skin layer. Zhu Ling works more broadly on deep-level fluid retention (Bladder, Kidney), while Fu Ling Pi is the specialist for surface and subcutaneous edema.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Fu Ling Pi

Fu Ling Pi should not be confused with Tu Fu Ling (土茯苓, Smilax glabra rhizome), which despite its similar name is a completely different plant from the Smilacaceae (greenbrier) family, with different properties (it clears Heat and resolves toxins). The two have no botanical relationship. Within the Poria sclerotium itself, the different parts (white interior, reddish layer, pine-root portion) are sometimes mixed or mislabelled. Authentic Fu Ling Pi should consist only of the dark outer skin. Low-quality commercial products may contain excessive soil, sand, or fragments of the inner sclerotium. Sulphur-fumigated products are a quality concern in the modern market.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Fu Ling Pi

Non-toxic

Fu Ling Pi is classified as non-toxic in the Chinese Pharmacopoeia and has a long history of safe use as both medicine and food. No toxic components have been identified. Occasional allergic reactions have been reported, with symptoms including itching, skin rashes, aching limbs, dizziness, and nausea, but these are rare. Quality concerns relate more to potential contamination from sulphur fumigation or heavy metals during processing rather than inherent toxicity of the herb itself.

Contraindications

Situations where Fu Ling Pi should not be used or requires extra caution

Caution

People with excessive urination or Yin deficiency with fluid depletion. Fu Ling Pi promotes urination and could worsen conditions where body fluids are already depleted.

Caution

Kidney Yin deficiency without Dampness. As a diuretic herb, Fu Ling Pi can further consume fluids and damage Yin when no pathological Dampness is present.

Caution

Sinking or prolapse conditions. Fu Ling Pi's descending, draining action is inappropriate when Qi needs to be lifted and consolidated.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Generally considered safe at standard doses during pregnancy. Poria cocos is classified as a superior-grade, non-toxic herb with a mild, neutral nature. It appears in several classical formulas traditionally used during pregnancy (such as formulas for pregnancy-related oedema). However, because Fu Ling Pi specifically promotes urination more strongly than the main body of Poria, it should be used judiciously and at appropriate doses under practitioner guidance during pregnancy, particularly if there is any underlying Yin or fluid deficiency.

Breastfeeding

No specific safety concerns have been documented for Fu Ling Pi during breastfeeding. The parent material Poria cocos is classified as non-toxic and has a long history as a food-grade substance in China. It is unlikely to adversely affect lactation or transfer harmful substances through breast milk. Standard doses are generally considered acceptable, but as with all herbs, use under practitioner guidance is recommended.

Children

Fu Ling Pi can be used in children at reduced dosages proportionate to age and body weight. Because it is non-toxic and mild in nature, it is generally well tolerated. However, in very young children or infants, its diuretic action should be monitored carefully to avoid excessive fluid loss. Dosage is typically reduced to one-third to one-half of the adult dose for school-age children.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Fu Ling Pi

No serious drug interactions have been specifically documented for Fu Ling Pi. However, based on the pharmacological profile of Poria cocos triterpenoids:

  • Diuretic medications: Fu Ling Pi has demonstrated diuretic effects with potassium-sparing properties. Concurrent use with pharmaceutical diuretics (thiazides, loop diuretics, potassium-sparing diuretics) could theoretically produce additive effects on fluid and electrolyte balance.
  • Hypoglycaemic agents: Poria cocos has shown blood sugar-lowering effects in some studies. Combined use with diabetes medications (metformin, sulfonylureas, insulin) may require blood sugar monitoring.
  • Immunosuppressants: Poria cocos polysaccharides have immunomodulatory activity. Patients taking immunosuppressant drugs should consult their healthcare provider before using Poria products.

Dietary Advice

Foods and dietary considerations when taking Fu Ling Pi

Avoid excessive consumption of cold, raw foods while taking Fu Ling Pi for oedema, as these can impair the Spleen's fluid-transforming function and counteract the herb's effects. Classical sources recommend avoiding vinegar when using Poria preparations, as vinegar is thought to be astringing and may interfere with the herb's water-moving action. A light, easily digestible diet that supports Spleen function is ideal when using this herb.

Botanical Description

Physical characteristics and morphology of the Fu Ling Pi source plant

Fu Ling Pi is not a plant but the outer skin (epidermis) of Wolfiporia extensa (syn. Poria cocos), a saprophytic polypore fungus in the family Polyporaceae. The fungus forms a large, compact, underground sclerotium (a dense mass of fungal tissue) that grows around the dead roots of pine trees, particularly Pinus massoniana (Masson pine) and Pinus densiflora. The sclerotium is irregularly shaped, resembling a large potato or sweet potato, typically 10 to 30 cm across and weighing 500 g to 5 kg or more.

The outer surface of the sclerotium is rough, wrinkled, and dark brown to blackish-brown in colour. When this outer layer is peeled away during processing, it becomes the medicinal product Fu Ling Pi. The interior of the sclerotium is white to pinkish-white and gives rise to the other medicinal products (Bai Fu Ling, Chi Fu Ling, Fu Shen). Wild Poria was traditionally found growing beneath aged pine trees, but modern cultivation uses inoculated pine logs or sawdust substrates buried in sandy soil.

Sourcing & Harvesting

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

Harvesting season

Typically harvested from July to September (autumn), after approximately 9 to 12 months of growth. Autumn harvest yields higher active ingredient content.

Primary growing regions

The finest quality Poria cocos (and therefore Fu Ling Pi) traditionally comes from Yunnan Province, where it is known as Yun Ling (云苓). Yunnan has been recognised as the premier production region (道地药材) since the Ming Dynasty. Other major production areas include Anhui Province (especially the Dabie Mountain region), Hubei Province, and Fujian Province. Historically, the terroir region shifted over time: in ancient texts the best Poria came from Shandong (Mount Tai), then during the Tang Dynasty it moved to Shaanxi (Mount Hua), and from the Ming Dynasty onward Yunnan became dominant. Around 70% of global cultivation occurs within China, mainly south of the Yangtze River.

Quality indicators

Good quality Fu Ling Pi consists of pieces of varying size and shape, with the outer surface being dark brown to blackish-brown and the inner surface being white or pale brownish. The texture should be relatively soft and slightly elastic, not brittle or overly dried out. It should be free of mould, insect damage, and excessive soil or sand. Authentic Fu Ling Pi has virtually no smell and a very bland taste. The key quality marker compound is pachymic acid, with triterpenoid content in the epidermis being significantly higher than in the white interior. Avoid pieces that smell of sulphur (indicating sulphur fumigation) or appear excessively white on the inner surface.

Classical Texts

Key passages from the classical Chinese medical texts that describe Fu Ling Pi and its therapeutic uses

Ben Cao Gang Mu (《本草纲目》, Li Shizhen, Ming Dynasty):
Original: 「茯苓皮主水肿肤胀，开水道，开腠理。」
Translation: "Fu Ling Pi treats oedema and skin distension, opens the waterways, and opens the interstices of the skin."

Yi Lin Zuan Yao (《医林纂要》):
Original: 「行皮肤之水。」
Translation: "It moves water within the skin."

Zhong Guo Yi Xue Da Ci Dian (《中国医学大辞典》):
Original: 「茯苓皮行水而不耗气，胜似大腹皮。」
Translation: "Fu Ling Pi moves water without consuming Qi, surpassing even Da Fu Pi (Areca peel) in this regard."

Ben Cao Cong Xin (《本草从新》):
Original: 「茯苓皮通、行水，治水肿肤胀。」
Translation: "Fu Ling Pi opens and moves water, treating oedema and skin swelling."

Historical Context

The history and evolution of Fu Ling Pi's use in Chinese medicine over the centuries

Fu Ling Pi was first formally distinguished as a separate medicinal product by Li Shizhen in the Ben Cao Gang Mu (本草纲目, 1578). Before this, classical texts discussed the whole Poria sclerotium without separating its outer skin. Li Shizhen described four distinct medicinal parts of the Poria fungus: Fu Ling Pi (the outer skin), Chi Fu Ling (the reddish layer), Bai Fu Ling (the white interior), and Fu Shen (the portion enveloping the pine root). This refined classification reflected a growing understanding that different parts of the same organism have distinct clinical strengths.

The parent fungus, Poria (Fu Ling), has over 2,000 years of medicinal history. It was listed as a superior-grade herb in the Shen Nong Ben Cao Jing, the oldest Chinese materia medica. Ancient Daoist practitioners prized it as one of the "Nine Immortal Herbs" and believed that consuming it could ward off hunger and prolong life. The classical teaching "ten prescriptions, nine contain Poria" (十药九茯苓) reflects how central this fungus has been to Chinese medicine. Zhang Zhongjing used Poria in over 40 of the 113 formulas in the Shang Han Za Bing Lun. Fu Ling Pi specifically became associated with the famous Wu Pi San (Five-Peel Powder) from the Zhong Zang Jing, a formula composed entirely of herb peels designed to treat superficial oedema.

Modern Research

3 published studies investigating the pharmacological effects or clinical outcomes of Fu Ling Pi

1

Diuretic activity of some fractions of the epidermis of Poria cocos (Preclinical, 2013)

Feng YL, Lei P, Tian T, Yin L, Chen DQ, Chen H, Mei Q, Zhao YY, Lin RC. Journal of Ethnopharmacology, 2013, 150(3): 1114-1118.

This animal study specifically tested the diuretic properties of Fu Ling Pi (the epidermis of Poria cocos). Ethanol extracts were divided into fractions and given to rats. The ethyl acetate and n-butanol fractions showed significant diuretic effects, increasing urinary output and sodium/chloride excretion while sparing potassium. The researchers concluded that lanostane-type triterpenoids are likely responsible for this potassium-sparing diuretic activity.

DOI
2

Poria cocos: traditional uses, triterpenoid components and their renoprotective pharmacology (Review, 2025)

Guo ZY, Wu X, Zhang SJ, Yang JH, Miao H, Zhao YY. Acta Pharmacologica Sinica, 2025, 46(4): 836-851.

This comprehensive review examined the triterpenoid components found in Poria cocos and particularly its surface layer (Fu Ling Pi). The review confirmed that the surface layer shows stronger diuretic activity than the inner part of the sclerotium. It also summarized evidence that these triterpenoids protect the kidneys through multiple molecular mechanisms, including modulation of TGF-beta, NF-kB, and Nrf2 signalling pathways, with potential benefits in acute kidney injury and chronic kidney disease.

DOI
3

Molecular basis for Poria cocos mushroom polysaccharide used as an antitumour drug in China (Review, 2019)

Li X, He Y, Zeng P, et al. Journal of Cellular and Molecular Medicine, 2019, 23(1): 4-20.

A review of 72 publications spanning 46 years of research on Poria cocos polysaccharides. It summarised evidence that polysaccharides from Poria cocos possess antitumour, immunomodulatory, anti-inflammatory, antioxidant, and anti-diabetic activities. A polysaccharide oral solution from Poria cocos was approved as a drug in China in 2015 for treating cancers and hepatitis. Note: the epidermis (Fu Ling Pi) has lower polysaccharide content than the inner sclerotium but higher triterpenoid content.

DOI

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.