Herb Bark (皮 pí / 树皮 shù pí)

Di Gu Pi

Lycium root bark · 地骨皮

Lycium chinense Mill. or Lycium barbarum L. · Cortex Lycii Radicis

Also known as: Wolfberry root bark, Lycium bark, Goji root bark,

Di Gu Pi (Lycium root bark) plant

Images shown are for educational purposes only

Dì Gǔ Pí is the root bark of the wolfberry (goji) plant, used to clear lingering low-grade fevers, night sweats, and hot flushes caused by the body's cooling system running low. It also soothes lung-related coughs from internal heat and has been traditionally used for excessive thirst and high blood pressure.

Category Heat-clearing herbs Herbs that clear Deficiency Heat (清虚热药)
Therapeutic focus Fever and Night Sweats Respiratory Health Blood Sugar Support Menopausal support Blood Pressure Support

TCM Properties

Temperature

Cold

Taste

Sweet (甘 gān), Bland (淡 dàn)

Channels entered

Lungs, Liver, 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 Di Gu Pi does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Di Gu Pi is primarily used to support these areas of health:

Fever and Night Sweats Respiratory Health Blood Sugar Support Menopausal support Blood Pressure Support

TCM Actions

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

Nourishes Yin and Clears Deficiency Heat Clears Lung Heat and Drains Lung Fire Cools the Blood and Stops Bleeding Generates Fluids and Relieves Thirst

How these actions work

'Cools the Blood and clears Deficiency Heat' is the primary action of Dì Gǔ Pí. 'Deficiency Heat' (also called 'steaming bone' fever) refers to a persistent, low-grade fever that worsens in the afternoon or at night, typically caused by depleted Yin failing to cool the body. This herb enters the Kidney and Liver channels to clear this deep-seated heat from the Yin layer. It is especially suited for chronic low-grade fevers, tidal fevers, night sweats, and a sensation of heat rising from the bones. A classical teaching distinguishes it from Mǔ Dān Pí (Moutan bark): Dì Gǔ Pí is traditionally associated with bone-steaming fever accompanied by sweating, while Mǔ Dān Pí is associated with bone-steaming without sweating, though in modern practice both are often combined.

'Clears Lung Heat and drains Lung Fire' refers to its ability to clear hidden or smouldering fire in the Lungs. When heat lodges in the Lungs, it disrupts the Lung's natural descending function, leading to coughing, wheezing, and sometimes blood-streaked sputum. Dì Gǔ Pí clears this Lung fire gently, without the harsh bitterness of herbs like Huáng Qín. It is the key partner to Sāng Bái Pí (Mulberry root bark) in Xiè Bái Sǎn, one of the most widely used formulas for Lung heat cough.

'Cools the Blood to stop bleeding' applies when heat in the Blood drives the Blood out of the vessels, causing nosebleeds, vomiting blood, blood in the urine, or coughing up blood. By cooling the Blood, this herb helps contain bleeding at its root cause.

'Generates fluids and treats thirst' is relevant to what TCM calls 'wasting-thirst' (消渴 xiāo kě), a condition characterized by excessive thirst and frequent urination that maps closely onto diabetes. By clearing internal heat and preserving Yin fluids, Dì Gǔ Pí addresses both the heat and the dryness driving these symptoms.

Patterns Addressed

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

Why Di Gu Pi addresses this pattern

In Yin Deficiency with Empty Heat, the body's cooling, moistening Yin substance is depleted, allowing internal heat to flare unchecked. This produces the hallmark 'steaming bone' tidal fever, night sweats, and a sensation of heat radiating from the core. Dì Gǔ Pí is cold and sweet, entering the Kidney and Liver channels where Yin Deficiency heat originates. Its cold nature directly counters the pathological heat, while its sweet and bland taste avoids damaging already depleted fluids. Unlike bitter-cold herbs that can be too harsh for a deficient constitution, Dì Gǔ Pí clears the deficiency fire gently, making it one of the most important herbs in this pattern.

A practitioner would look for one or more of these signs

Night Sweats

Night sweats that soak bedclothes

Tidal Fever

Afternoon or evening low-grade fevers

Five-Center Heat

Heat in palms, soles, and chest

Dry Mouth

Dry mouth with desire to drink

Commonly Used For

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

Arises from: Yin Deficiency

TCM Interpretation

In TCM, night sweats are closely associated with Yin Deficiency. During sleep, Yáng Qi naturally moves inward. When Yin is insufficient to anchor this inward-moving Yáng, deficiency heat builds up and forces fluids outward through the skin as sweat. This is why the sweating occurs at night rather than during the day. The root cause is in the Kidney and Liver Yin, and the heat is 'empty' (not from an external pathogen) but from a relative excess of Yáng due to depleted Yin.

Why Di Gu Pi Helps

Dì Gǔ Pí enters the Kidney and Liver channels and clears the deficiency heat that drives the sweating. Its cold nature directly counters the pathological empty heat, while its sweet, bland taste avoids further draining already depleted Yin fluids. By clearing the heat at its source, the body's Yin can once again anchor Yáng at night, stopping the sweating. It is commonly used alongside Yin-nourishing herbs like Zhī Mǔ and Biē Jiǎ to address both the heat (the branch) and the Yin Deficiency (the root).

Also commonly used for

Low Grade Fever

Chronic low-grade or tidal fever

Hypochondrial Pain That Is Worse On Coughing And Breathing

From Lung Heat, especially with blood-streaked sputum

Nosebleeds

From Blood Heat

Hemoptysis

Coughing up blood

Blood In Urine

From Blood Heat

Hot Flushes

Menopausal or from Yin Deficiency

Toothache

From Yin-deficient fire flaring upward

Herb Properties

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

Temperature

Cold

Taste

Sweet (甘 gān), Bland (淡 dàn)

Channels Entered

Lungs Liver Kidneys

Parts Used

Bark (皮 pí / 树皮 shù pí)

Dosage & Preparation

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

Standard dosage

9-15g

Maximum dosage

Up to 30g in severe deficiency Heat or Lung Heat conditions, under practitioner supervision. The Ben Cao Xin Bian recommends up to 15-30g (五钱至一两) to adequately cool bone-level Heat.

Dosage notes

Use the standard range of 9-15g for most presentations of Yin-deficiency Heat, bone-steaming fever, and Lung Heat cough. For stubborn or severe bone-steaming conditions, some classical sources recommend higher doses of 15-30g to reach the deeper levels of Heat. When used primarily to cool Blood in bleeding conditions, moderate doses of 9-15g are generally sufficient. The Ben Cao Zheng notes that southern-sourced Di Gu Pi (lighter bitterness, slightly sweet) is preferred over northern varieties (more bitter), as it is gentler and more effective. Classical texts advise against using iron utensils when decocting this herb.

Preparation

Remove any remaining wood core fragments before decocting. Wash briefly and cut into segments. Classical sources advise against decocting in iron vessels (《医学入门》: 忌铁). No other special decoction handling is required; decoct normally with other herbs.

Processing Methods

In TCM, the same herb can be prepared in different ways to change its effects — here's how processing alters what Di Gu Pi does

Processing method

Stir-fried with wheat bran (麸皮) until lightly browned. The bran is heated first until smoking, then the herb pieces are added and stirred until they turn slightly yellow, then the bran is sifted out.

How it changes properties

Bran-frying slightly moderates the cold nature of the herb, reducing the risk of damaging the Spleen and Stomach. However, evidence suggests that high-temperature processing may degrade some active compounds (e.g. betaine), so this form is used cautiously. The core actions remain the same but are somewhat gentler.

When to use this form

When the patient has Yin Deficiency heat but also has a weak Spleen and Stomach that may not tolerate the full cold nature of raw Dì Gǔ Pí. However, this processed form is not universally adopted and the raw form remains the clinical standard in most regions.

Common Herb Pairs

These ingredients are traditionally combined with Di Gu Pi for enhanced therapeutic effect

Sang Bai Pi
Sang Bai Pi 1:1 (e.g. Sāng Bái Pí 10g : Dì Gǔ Pí 10g)

Sāng Bái Pí works primarily in the Qi level to drain Lung heat and calm wheezing, while Dì Gǔ Pí works in the Yin level to clear hidden Lung fire and protect fluids. Together they clear Lung heat thoroughly from both levels without damaging Yin or being overly harsh. This is the classical pair at the heart of Xiè Bái Sǎn.

When to use: Lung heat cough with wheezing, skin that feels hot to the touch (especially in the afternoon), yellow tongue coating, and a rapid thin pulse. Also useful when Lung heat produces blood-streaked sputum.

Bie Jia
Bie Jia 1:1 to 1:2 (e.g. Dì Gǔ Pí 10g : Biē Jiǎ 15g)

Biē Jiǎ (Turtle shell) nourishes Yin and anchors Yáng from the depths of the Kidney, while Dì Gǔ Pí clears the deficiency heat that arises when Yin is depleted. Together they treat both the root (Yin Deficiency) and the branch (empty heat), making this a powerful pairing for bone-steaming fever.

When to use: Bone-steaming tidal fever, night sweats, emaciation, and chronic low-grade fevers from conditions like tuberculosis or post-illness recovery where Yin has been significantly consumed.

Qing Hao
Qing Hao 1:1 (e.g. Dì Gǔ Pí 10g : Qīng Hāo 10g)

Qīng Hāo (Sweet wormwood) clears deficiency heat through a light, outward-dispersing action, while Dì Gǔ Pí clears it from deep in the Yin level. Together, they clear deficiency heat from both the interior and the surface, making this pair particularly effective for stubborn tidal fevers that resist single-herb treatment.

When to use: Lingering afternoon or evening fevers from Yin Deficiency, chronic illness with persistent low-grade temperature elevation, and fevers of unknown origin with Yin Deficiency signs.

Mu Dan Pi
Mu Dan Pi 1:1 (e.g. Dì Gǔ Pí 10g : Mǔ Dān Pí 10g)

Both herbs cool the Blood and clear deficiency heat, but they reach different organ systems. Dì Gǔ Pí focuses on clearing Lung and Kidney heat, while Mǔ Dān Pí focuses on Liver heat and also invigorates Blood circulation and disperses stasis. Combined, they provide broader coverage of deficiency heat across multiple organs.

When to use: Yin Deficiency heat with bleeding symptoms (nosebleeds, vomiting blood) where heat affects both the Lung/Kidney and the Liver/Blood level simultaneously. Also used for bone-steaming fever whether accompanied by sweating or not.

Key Formulas

These well-known formulas feature Di Gu Pi in a prominent role

Di Gu Pi Yin 地骨皮飲 King

Dì Gǔ Pí Tāng from the Shèng Jì Zǒng Lù is named directly after this herb, which serves as King. Combined with Biē Jiǎ, Zhī Mǔ, Yín Chái Hú, Qín Jiāo, Bèi Mǔ, and Dāng Guī, it treats consumptive diseases with bone-steaming tidal fever, fully showcasing Dì Gǔ Pí's primary action of clearing deficiency heat.

Xie Bai San 瀉白散 Deputy

Xiè Bái Sǎn (Drain the White Powder), from Qián Yǐ's Xiǎo Ér Yào Zhèng Zhí Jué, is the most iconic formula featuring Dì Gǔ Pí. As Deputy to Sāng Bái Pí (the King), Dì Gǔ Pí clears the hidden fire smouldering deep in the Lung's Yin layer. This formula perfectly showcases its ability to clear Lung fire gently without harsh bitterness, making it safe even for children.

Qing Gu San 清骨散 Assistant

Qīng Gǔ Sǎn (Cool the Bones Powder), from Zhèng Zhì Zhǔn Shéng, is the definitive formula for bone-steaming tidal fever from Yin Deficiency. Dì Gǔ Pí works as Assistant alongside Yín Chái Hú, Hú Huáng Lián, Qīn Jiāo, Biē Jiǎ, Qīng Hāo, and Zhī Mǔ, contributing its ability to clear deficiency heat from the Kidney and Liver Yin level.

Comparable Ingredients

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

Mu Dan Pi
Di Gu Pi vs Mu Dan Pi

Both cool the Blood and clear deficiency heat, and both are used for bone-steaming tidal fever. The key difference: Dì Gǔ Pí excels at clearing Lung heat and Kidney deficiency heat, while Mǔ Dān Pí excels at clearing Liver heat and Blood-level excess heat, and additionally invigorates Blood and disperses stasis. Mǔ Dān Pí can treat both deficiency and excess Blood-heat patterns; Dì Gǔ Pí is more focused on deficiency heat. Choose Dì Gǔ Pí when Lung heat cough or Kidney Yin Deficiency dominates. Choose Mǔ Dān Pí when Liver fire, Blood stasis, or menstrual issues are prominent.

Bai Wei
Di Gu Pi vs Bai Wei

Both clear deficiency heat and are used for Yin Deficiency fevers. Bái Wēi (Cynanchum root) is bitter, salty, and cold, and it also cools the Blood and promotes urination. It is often used for postpartum deficiency fevers and for heat entering the Blood in warm-disease patterns. Dì Gǔ Pí is sweeter and milder, better for chronic bone-steaming fevers with prominent Lung involvement (cough) or for wasting-thirst. Choose Bái Wēi when the deficiency heat has a stronger Blood-level or postpartum component.

Yin Chai Hu
Di Gu Pi vs Yin Chai Hu

Both are key herbs for clearing deficiency heat and bone-steaming fever. Yín Chái Hú (Stellaria root) is sweet, slightly cold, and focused specifically on clearing deficiency heat, with a particular application for childhood nutritional impairment (疳积) fevers. It does not have the Lung heat-clearing or Blood-cooling actions that Dì Gǔ Pí possesses. Choose Yín Chái Hú for pure deficiency heat, especially in children with malnutrition-related fevers. Choose Dì Gǔ Pí when Lung heat cough, Blood heat bleeding, or wasting-thirst accompanies the deficiency heat.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Di Gu Pi

Di Gu Pi is frequently adulterated or confused with root barks of similar appearance. The most common adulterant is the root bark of Cynanchum chinense (鹅绒藤根皮, Goose-down Vine Root Bark). Key differences: genuine Di Gu Pi has an outer surface that flakes in scales and a two-layered cross-section (outer yellowish-brown, inner greyish-white), tastes sweet then bitter, and grinds to a fine powder easily. The Cynanchum adulterant shows a three-layered cross-section (pale outer, thick brown middle, pale inner), tastes bland, feels gritty when chewed, and resists grinding into powder. Another adulterant is Quanpi (荃皮), which is shorter (2-5 cm), has yellow powdery substance in its cracks, a faintly fragrant odour, and a bitter-astringent taste with visible stone cell ring bands in cross-section. Pharmacopoeias in China, Japan, and Korea specify that authentic Di Gu Pi must come only from L. chinense or L. barbarum root bark.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Di Gu Pi

Non-toxic

Di Gu Pi has very low toxicity. Animal studies show that the LD50 for decoction given by intraperitoneal injection in mice is approximately 12.8 g/kg, indicating a wide safety margin. The tincture LD50 is approximately 4.7 g/kg intraperitoneally. There is no significant accumulation with repeated dosing over seven days. In rabbits given large oral doses (80 g/kg), only temporary lethargy was observed, with recovery in 3-4 hours. In dogs given 120 g/kg orally, vomiting and weakness occurred, with full recovery in 2-3 days. At toxic doses in guinea pigs, partial or complete atrioventricular block has been observed. The classical text Ming Yi Bie Lu records it as 'greatly cold, non-toxic' (大寒，无毒). No serious adverse effects are reported at standard clinical doses. Overdose or prolonged use may cause stomach discomfort, nausea, or loose stools due to its cold nature.

Contraindications

Situations where Di Gu Pi should not be used or requires extra caution

Caution

Spleen and Stomach deficiency Cold with loose stools (脾胃虚寒便溏). Di Gu Pi is sweet and cold in nature, and will further damage the already weakened digestive system, worsening diarrhea and abdominal discomfort.

Caution

Exterior Wind-Cold patterns with fever. Di Gu Pi clears internal deficiency Heat; using it for externally contracted Cold-type fevers is inappropriate and may trap the pathogen inside. The classical text Ben Cao Zheng states: 'Do not use for false Heat' (假热者勿用).

Avoid

Allergy or known hypersensitivity to Lycium species (wolfberry/goji family). Discontinue use if signs of allergic reaction occur.

Caution

Yin-deficiency Fire patterns accompanied by very weak digestion and poor appetite. The Ben Cao Hui Yan cautions: when there is vigorous deficiency Fire but the Spleen and Stomach are weak with reduced appetite and loose stools, the dosage should be reduced.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Use with caution during pregnancy. Animal studies have shown that Di Gu Pi injection has a significant uterine-stimulating effect on the isolated uterus of non-pregnant rats and mice, with potency equivalent to approximately 0.054 units of posterior pituitary extract per 1 ml. While the clinical relevance of injectable preparations to oral decoction is uncertain, this uterotonic property warrants caution. Pregnant women should avoid this herb unless specifically prescribed by a qualified practitioner, and it should not be used at high doses during pregnancy.

Breastfeeding

No specific safety data is available for Di Gu Pi during breastfeeding. Its cold nature and the presence of various alkaloids (including trace amounts of atropine and scopolamine) suggest caution. Nursing mothers should consult a qualified practitioner before use and avoid prolonged or high-dose administration.

Children

Di Gu Pi has a long history of paediatric use. The famous formula Xie Bai San (Drain the White Powder) from Qian Yi's Xiao Er Yao Zheng Zhi Jue was specifically designed for children with Lung Heat causing coughing and wheezing. It was also traditionally used for childhood nutritional accumulation fever (小儿疳积发热). Dosage should be proportionally reduced based on age and body weight: roughly one-third to one-half of the adult dose for children aged 3-7, and one-half to two-thirds for children aged 7-14. Because of its cold nature, prolonged use in children with weak digestion should be avoided.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Di Gu Pi

Warfarin and anticoagulants: Two case reports have documented possible interaction between Lycium products and warfarin, resulting in elevated INR values. Although these cases involved goji berry fruit rather than root bark specifically, the shared botanical origin warrants caution. Patients on warfarin or other anticoagulants should have their INR monitored if taking Di Gu Pi.

Antihypertensive medications: Di Gu Pi has demonstrated significant blood pressure-lowering effects in animal studies through mechanisms involving the CNS, sympathetic nerve blockade, and direct vasodilation. Concurrent use with antihypertensive drugs may result in additive hypotensive effects.

Hypoglycaemic agents: Di Gu Pi decoction has been shown to lower blood sugar in animal studies, with a persistent effect lasting 4-8 hours. Patients taking insulin or oral hypoglycaemic drugs should be monitored for enhanced blood sugar lowering when Di Gu Pi is co-administered.

Dietary Advice

Foods and dietary considerations when taking Di Gu Pi

Because Di Gu Pi is cold in nature and targets internal Heat, avoid excessively cold and raw foods that could further weaken the Spleen and Stomach, especially in people with borderline digestion. Avoid greasy, heavy, and fried foods that generate Damp-Heat and counteract the herb's cooling, clearing action. Mild, easily digestible foods are preferred during use. The classical advice to avoid iron extends to cooking vessels: use ceramic or glass pots for the decoction.

Botanical Description

Physical characteristics and morphology of the Di Gu Pi source plant

Di Gu Pi is the dried root bark of Lycium chinense Mill. or Lycium barbarum L., both deciduous shrubs in the Solanaceae (nightshade) family. Lycium chinense typically grows 0.5 to 1 metre tall with slender, arching branches that are often covered with thin spines. The leaves are papery, ovate or ovate-lanceolate, and the flowers are funnel-shaped and pale purple (lilac). The plant produces small, coral-red to orange-red berries from summer into autumn (these are the well-known goji berries, used separately as Gou Qi Zi).

Both species commonly grow on hillsides, wasteland, saline-alkaline ground, and roadsides. They are drought-tolerant but intolerant of waterlogging, preferring well-drained, neutral to slightly acidic soils. Lycium chinense is distributed across China, Korea, and Japan, while Lycium barbarum is native to northwestern China and now found across Asia and southeastern Europe. The medicinal root bark is harvested from mature plants by digging up the roots, washing off soil, and carefully peeling away the bark.

Sourcing & Harvesting

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

Harvesting season

Early spring or late autumn. Roots are dug up, washed, and the bark is peeled off and sun-dried.

Primary growing regions

Widely distributed across China. Major production regions include Shanxi, Henan, Hebei, Shaanxi, Jiangsu, and Zhejiang provinces. Ningxia and Gansu provinces are the primary sources for L. barbarum root bark. Jiangsu and Zhejiang are traditionally considered to produce the highest quality (品质较好). The herb also comes from Hubei and other central/eastern Chinese provinces. Most commercial supply is wild-harvested, though some cultivated sources exist.

Quality indicators

Good quality Di Gu Pi appears as tubular or trough-shaped bark pieces, 3-10 cm long, 0.5-1.5 cm wide, 1-3 mm thick. The outer surface should be greyish-yellow to brownish-yellow with irregular longitudinal cracks, and the cork layer easily flakes off in scales. The inner surface should be yellowish-white, relatively smooth, with fine longitudinal striations. The cross-section shows a distinct outer yellowish-brown layer and inner greyish-white layer. It should be light, brittle, and snap easily with an uneven fracture. The smell is faint, and the taste is slightly sweet followed by a mild bitterness. The classical identification mnemonic is 'trough bark, white inside, no aroma' (槽皮白里无香气). Best quality pieces are large, thick-barked, free of wood core remnants, and free of soil and debris.

Classical Texts

Key passages from the classical Chinese medical texts that describe Di Gu Pi and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

Chinese: 味苦寒。主五内邪气，热中，消渴，周痹。久服，坚筋骨，轻身不老。一名杞根，一名地骨。

English: Bitter in taste, cold in nature. Governs pathogenic Qi in the five viscera, Heat in the centre, wasting-thirst, and generalized painful obstruction. Long-term use strengthens sinews and bones, makes the body light, and prevents aging. Also called 'Qi Root' and 'Earth Bone.'

Ben Cao Gang Mu (《本草纲目》, Li Shizhen)

Chinese: 根乃地骨，甘淡而寒，下焦肝肾虚热者宜之……枸杞、地骨，甘寒平补，使精气充而邪火自退之妙，惜哉！予尝以青蒿佐地骨退热，屡有殊功。

English: The root is the 'Earth Bone,' sweet, bland, and cold, suitable for deficiency Heat of the Liver and Kidney in the lower burner... Gou Qi and Di Gu Pi are sweet-cold and gently supplementing; they fill the essence and Qi so that pathogenic Fire naturally retreats. I have often used Qing Hao alongside Di Gu Pi to reduce fever, with remarkable results on many occasions.

Ming Yi Bie Lu (《名医别录》)

Chinese: 大寒，无毒。主风湿，下胸胁气，客热头痛，补内伤大劳嘘吸，坚筋，强阴，利大小肠，耐寒暑。

English: Greatly cold, non-toxic. Governs Wind-Damp, descends Qi from the chest and flanks, treats guest-Heat headache, supplements internal injury from great taxation and laboured breathing, strengthens sinews, fortifies Yin, benefits the large and small intestines, and builds tolerance to cold and heat.

Yao Pin Hua Yi (《药品化义》)

Chinese: 地骨皮，外祛无定虚邪，内除有汗骨蒸……牡丹皮能去血中热，地骨皮能去气中之热，宜别而用。

English: Di Gu Pi outwardly expels unfixed deficiency pathogens, inwardly clears bone-steaming with sweating... Mu Dan Pi can clear Heat from the Blood, while Di Gu Pi can clear Heat from the Qi level. They should be distinguished in clinical use.

Historical Context

The history and evolution of Di Gu Pi's use in Chinese medicine over the centuries

Di Gu Pi first appeared in the Shen Nong Ben Cao Jing (circa 100 CE), one of the oldest Chinese materia medica texts, where it was classified as an upper-grade (上品) herb. The name 'Di Gu Pi' (地骨皮) literally means 'earth bone bark,' reflecting the classical idea that the root bark connects to the deepest, bone-level Heat in the body. Li Shizhen's Ben Cao Gang Mu (1596) famously organized the Lycium plant by its parts: spring leaves called 'Tian Jing Cao' (天精草, heavenly essence herb), summer flowers called 'Chang Sheng Cao' (长生草, long-life herb), autumn berries called 'Gou Qi Zi' (枸杞子), and winter roots called 'Di Gu Pi' (地骨皮). This poetic taxonomy highlights the plant's reputation as a herb of longevity and vitality, with each season yielding a different medicine.

Li Shizhen made a particularly influential observation: while most physicians relied on bitter-cold herbs like Huang Qin, Huang Lian, Huang Bai, and Zhi Mu to clear Fire, Di Gu Pi offered a gentler, sweet-cold approach that nourished essence while allowing pathogenic Fire to subside naturally. He frequently paired it with Qing Hao (sweet wormwood) for stubborn deficiency fevers. The Song Dynasty physician Qian Yi included Di Gu Pi in his celebrated formula Xie Bai San (also called 'Drain the White Powder') in the Xiao Er Yao Zheng Zhi Jue, specifically designed to clear Lung Fire in children. The Jin Dynasty physician Li Gao (Li Dongyuan) noted that adding Di Gu Pi and Mu Dan Pi to Si Wu Tang was superb for treating women's bone-steaming conditions.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Di Gu Pi

1

Comprehensive review of Goji phytochemistry, pharmacology and safety (2010)

Potterat O. Planta Medica. 2010;76(1):7-19.

This review examined the constituents and pharmacological properties of both Lycium barbarum and L. chinense, including the root bark (Di Gu Pi). Root bark compounds demonstrated hepatoprotective actions and inhibitory effects on the renin-angiotensin system, supporting the traditional use for hypertension. The review noted no signs of inherent toxicity but flagged two case reports of possible interaction with warfarin.

2

NF-κB inhibitors and PPARγ agonists from Lycium chinense root bark (in vitro, 2014)

Xie LW, Atanasov AG, Guo DA, et al. Journal of Ethnopharmacology. 2014;152(3):470-477.

This activity-guided fractionation study identified phenolic amides, particularly trans-N-caffeoyltyramine, as the main compounds responsible for NF-κB inhibition (IC50 of 18.4 μM) in root bark extracts. Fatty acid-enriched fractions activated PPARγ, a key transcription factor in diabetes-related gene regulation. These findings provide molecular evidence supporting the traditional anti-inflammatory and anti-diabetic uses of Di Gu Pi.

3

Gastroprotective effects of Lycium chinense root bark extract in mice (preclinical, 2016)

Chen H, Olatunji OJ, Zhou Y. Journal of Natural Medicines. 2016;70(3):610-619.

The ethyl acetate fraction of L. chinense root bark was tested against ethanol-induced gastric ulcer in mice. Oral administration increased gastric mucus content, restored antioxidant enzyme levels (SOD, glutathione), reduced oxidative damage markers (MDA), and decreased pro-inflammatory markers and caspase-3 levels, indicating antioxidant, anti-inflammatory, anti-secretory, and anti-apoptotic protective effects.

4

Chemical constituents and bioactivities comparison of Lycium barbarum plant parts (in vitro, 2019)

Published in Antioxidants (MDPI). 2019;8(12):605. (PMC6514792)

Using UPLC-HR-MS, researchers compared chemical profiles of L. barbarum fruits, leaves, and root barks. Root bark contained the highest levels of dicaffeoylspermine/spermidine derivatives (e.g. kukoamine B at 10.90 mg/g dry powder) and demonstrated the strongest antioxidative activity and cytotoxicity among the three plant parts tested.

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.