Herb Rhizome (根茎 gēn jīng)

Tu Fu Ling

Glabrous greenbrier rhizome · 土茯苓

Smilax glabra Roxb. · Rhizoma Smilacis Glabrae

Also known as: Shan Gui Lai (山归来), Chinese Smilax

Tu Fu Ling (Glabrous greenbrier rhizome) plant

Images shown are for educational purposes only

Tu Fu Ling is a gentle but powerful detoxifying herb used for skin conditions such as eczema, boils, and rashes caused by internal dampness and heat. It is also widely used today for gout and joint inflammation, and has a long history of treating infections. Its mild, neutral nature means it can be taken safely in relatively large doses.

Category Heat-clearing herbs Herbs that clear Heat and resolve Toxicity (清热解毒药)
Therapeutic focus Skin Health Bone and Joint Health Urinary Health Detoxification

TCM Properties

Temperature

Neutral

Taste

Sweet (甘 gān), Bland (淡 dàn)

Channels entered

Liver, Stomach

Parts used

Rhizome (根茎 gēn jīng)

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

Therapeutic focus

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

Skin Health Bone and Joint Health Urinary Health Detoxification

TCM Actions

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

Resolves Toxicity Drains Dampness Frees the Joints and Channels Clears Heat-Toxin from the Skin Promotes Urination and Drains Dampness

How these actions work

'Resolves toxins' (解毒 jiě dú) is this herb's most celebrated action. It means Tu Fu Ling can neutralise and expel deeply lodged toxic substances from the body. Historically it was the primary herb for treating syphilitic sores (杨梅疮 yáng méi chuāng) and mercury poisoning from early treatments for syphilis. In modern practice, this detoxifying action is applied to any condition where toxic Damp-Heat accumulates in the skin and flesh, producing sores, boils, carbuncles, and abscesses. Its sweet, bland, neutral nature allows it to be used in large doses over extended periods without damaging Yin or aggravating Cold.

'Eliminates Dampness' (除湿 chú shī) refers to Tu Fu Ling's ability to drain pathological moisture from the body through gentle percolation. Its bland taste naturally promotes the seeping and draining of Dampness, making it useful for conditions such as cloudy or painful urination (turbid strangury), excessive vaginal discharge, and eczema or weeping skin lesions. Unlike harsh drying herbs, its neutral temperature makes it safe for patients whose Dampness coexists with Heat.

'Frees the joints and sinews' (通利关节 tōng lì guān jié) means it can unblock the channels and pathways around joints that have become obstructed by Damp-Heat or toxic accumulations. This is why it was used for joint stiffness, pain, and contractures caused by syphilis or mercury toxicity, and in modern practice for gout and rheumatic conditions where Dampness and Heat lodge in the joints.

Patterns Addressed

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

Why Tu Fu Ling addresses this pattern

When Damp-Heat lodges in the skin and flesh, it produces weeping sores, eczema, itching, and pustular lesions. Tu Fu Ling's sweet, bland taste promotes the seeping and draining of Dampness through the urine, while its detoxifying action clears the Heat-toxins causing the skin eruptions. Because it enters the Liver channel (which governs the sinews and influences skin conditions related to Blood and Wind) and the Stomach channel (the source of Dampness when Spleen-Stomach function is impaired), it addresses this pattern at its root. Its neutral temperature allows prolonged use without further damaging Yin, which is important in chronic skin conditions.

A practitioner would look for one or more of these signs

Eczema

Weeping, itchy skin lesions

Skin Rashes

Red, inflamed rashes with pustules or papules

Thin Vaginal Discharge

Yellow, foul-smelling vaginal discharge from Damp-Heat pouring downward

Skin Itching

Persistent itching worse with heat and moisture

Commonly Used For

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

Arises from: Damp-Heat in the Liver

TCM Interpretation

TCM understands eczema primarily as a condition of Damp-Heat lodging in the skin. When the Spleen fails to transform and transport fluids properly, internal Dampness accumulates. This Dampness can combine with Heat (from diet, emotional stress, or external exposure) and pour outward to the skin, where it produces the characteristic weeping, red, itchy lesions. Chronic cases may also involve Blood Deficiency generating Wind and dryness. The Liver channel's role in governing the free flow of Qi and its close relationship with the skin (through Wind) means Liver channel Heat or constraint often contributes to the itching and spreading nature of eczema.

Why Tu Fu Ling Helps

Tu Fu Ling addresses eczema through two complementary mechanisms. Its bland taste promotes the draining of Dampness through urination, removing the pathological moisture that feeds the weeping skin lesions. Its toxin-resolving action clears the Heat component that drives the redness, inflammation, and itching. Because Tu Fu Ling enters the Liver and Stomach channels, it works on both the Liver-related itching and the Spleen-Stomach dysfunction that generates the underlying Dampness. Its neutral temperature is a significant advantage in eczema treatment: unlike cold-natured herbs that might impair the Spleen further (worsening Dampness production), Tu Fu Ling clears Heat without creating new problems.

Also commonly used for

Psoriasis

Used in compound formulas for skin lesions

Rheumatoid Arthritis

Damp-Heat type with red, swollen, painful joints

Thin Vaginal Discharge

Yellow, malodorous discharge from Damp-Heat

Keratitis

Contact or allergic dermatitis with Damp-Heat presentation

Syphilis

Classical primary indication; used historically for syphilitic sores

Acne

Damp-Heat type acne with pustules and inflammation

Hepatitis

Used in formulas for Damp-Heat type hepatitis

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

Liver Stomach

Parts Used

Rhizome (根茎 gēn jīng)

Dosage & Preparation

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

Standard dosage

15-60g

Maximum dosage

Up to 60g in standard clinical practice for conditions such as syphilitic sores, severe skin conditions, or gout. Some traditional sources use up to 150g (5 liang) in severe acute infections such as leptospirosis, but such high doses require practitioner supervision.

Dosage notes

Standard decoction doses range from 15 to 60g. For mild skin conditions or preventive use, 15 to 30g is typical. For treating severe damp-heat toxin conditions such as recurrent eczema, gout, or syphilitic sores, doses of 30 to 60g are common. When used in large doses for acute infections (e.g. leptospirosis), historical reports describe up to 60 to 150g daily, divided into multiple doses. The herb can also be ground to powder and applied externally mixed with vinegar for toxic sores and abscesses. Classical texts note that tea should not be consumed concurrently, as it is believed to reduce efficacy.

Preparation

No special decoction handling is required. Tu Fu Ling is simply sliced and decocted normally. Classical sources specifically note that it should not be prepared or decocted in iron vessels (不犯铁器), as iron is believed to reduce its therapeutic efficacy. Use ceramic, enamel, or stainless steel vessels instead.

Common Herb Pairs

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

Bi Xie
Bi Xie 1:1 (Tu Fu Ling 15–30g : Bi Xie 10–15g)

Tu Fu Ling resolves toxins and eliminates Dampness, while Bi Xie (Dioscorea hypoglauca) excels at separating the clear from the turbid and draining Dampness from the Lower Burner. Together they powerfully clear turbid Dampness from the urinary and joint systems, addressing both the toxic and the turbid aspects of Damp-Heat conditions.

When to use: Turbid, painful urination (especially cloudy or milky urine), gout with joint swelling and pain, or Damp-Heat obstruction in the joints.

Bai Xian Pi
Bai Xian Pi 1:1 (Tu Fu Ling 15–30g : Bai Xian Pi 10–15g)

Tu Fu Ling resolves toxins and drains Dampness with its bland, neutral nature, while Bai Xian Pi (Dictamnus root bark) is bitter and cold, strongly clearing Heat, drying Dampness, and stopping itching. The combination greatly enhances the ability to clear Damp-Heat from the skin and relieve itching.

When to use: Eczema, dermatitis, urticaria, or any itchy skin condition with a Damp-Heat presentation (red, weeping, inflamed skin).

Jin Yin Hua
Jin Yin Hua 2:1 (Tu Fu Ling 30g : Jin Yin Hua 15g)

Tu Fu Ling resolves deep-seated Damp-Heat toxins through gentle draining, while Jin Yin Hua (honeysuckle flower) is a powerful Heat-clearing and toxin-resolving herb that works more on the superficial and acute level. Together they address toxins at both deep and superficial layers, providing comprehensive detoxification.

When to use: Sores, boils, carbuncles, or infectious skin conditions with significant Heat-toxin. Also used together in the classical approach to treating syphilitic lesions.

Shu Di Huang
Shu Di Huang 1:1 (Tu Fu Ling 15–30g : Sheng Di Huang 15–30g)

Tu Fu Ling resolves toxins and drains Dampness, while Sheng Di Huang (raw Rehmannia) cools the Blood, clears Heat, and nourishes Yin. Together they cool the Blood and resolve toxins while moistening dryness, addressing conditions where Heat-toxins have damaged Blood and Yin.

When to use: Chronic skin itching from Blood Deficiency with residual Damp-Heat, or skin conditions where both Damp-Heat and Blood-Dryness coexist.

Comparable Ingredients

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

Fu Ling
Tu Fu Ling vs Fu Ling

Despite the similar names, these are entirely different herbs. Both are sweet, bland, and neutral, and both drain Dampness. However, Fu Ling (Poria) is primarily a Spleen-tonifying and water-draining herb for oedema, loose stools, and palpitations, entering the Spleen, Heart, and Kidney channels. Tu Fu Ling enters the Liver and Stomach channels and excels at resolving toxins and freeing the joints. Choose Fu Ling for water retention and Spleen weakness; choose Tu Fu Ling for Damp-Heat skin conditions, joint pain from toxin accumulation, and urinary infections.

Bai Hua She She Cao
Tu Fu Ling vs Bai Hua She She Cao

Both clear Heat, resolve toxins, and drain Dampness. However, Bai Hua She She Cao (Oldenlandia) is bitter and cold with stronger Heat-clearing and anti-tumour actions, mainly used for hot toxic sores, intestinal abscesses, and cancer-related conditions. Tu Fu Ling is neutral and bland, specialising in resolving Damp-Heat toxins in the skin and joints, and is uniquely indicated for syphilis, mercury poisoning, and gout. Choose Bai Hua She She Cao for intense Heat-toxin with masses; choose Tu Fu Ling for chronic Damp-Heat in skin, joints, or the urogenital system.

Yi Yi Ren
Tu Fu Ling vs Yi Yi Ren

Both drain Dampness and are mild in nature. Yi Yi Ren (Coix seed) is slightly cold, enters the Spleen and Lung channels, and focuses on strengthening the Spleen, draining Dampness, and clearing Heat from the Lungs. It does not have significant toxin-resolving action. Tu Fu Ling enters the Liver and Stomach, has stronger detoxifying power, and specifically frees the joints. For skin conditions with Damp-Heat, they are often combined. Choose Yi Yi Ren when Spleen weakness and Dampness predominate; choose Tu Fu Ling when toxin accumulation and joint involvement are the main concern.

Common Substitutes & Adulterants

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

Tu Fu Ling is frequently confused with or substituted by several related species. The most common adulterants include: 1. Ba Qia (菝葜, Smilax china) - sometimes sold as "white Tu Fu Ling" in Guangdong, Sichuan, Zhejiang, and other provinces. Distinguished by its thorny stems (Tu Fu Ling stems are smooth), red fruits (vs. blue-black), and a cross-section that is darker reddish-brown with more woody fibres and no sticky feeling when moistened. 2. Xiao Ba Qia (肖菝葜, Heterosmilax spp.) - sold as "white Tu Fu Ling" (白土苓) in Sichuan, Hubei, Shandong, and Ningxia. Microscopically distinguished by having amphicribral vascular bundles (周木维管束) rather than Tu Fu Ling's collateral bundles (外韧维管束). 3. Jin Qiao Mai root (金荞麦, Fagopyrum dibotrys) - a completely unrelated plant whose root can resemble Tu Fu Ling. Distinguished by its purplish-grey surface, smaller size, and yellowish cross-section with visible pith. It lacks the sweet taste of Tu Fu Ling. Key identification: authentic Tu Fu Ling has a smooth (not spiny) stem on the living plant, a starchy cut surface with visible small bright sparkles, and becomes distinctly slippery when moistened.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Tu Fu Ling

Non-toxic

Tu Fu Ling is classified as non-toxic in both classical texts and the modern Chinese Pharmacopoeia. The Ben Cao Gang Mu and Ben Cao Tu Jing both explicitly state it is "wu du" (无毒, without toxicity). Its starchy rhizome has a long history of safe use as food during famines. No toxic components have been identified at standard dosages. Rare adverse reactions are limited to allergic responses (skin itching, papules) in sensitive individuals, which resolve upon discontinuation.

Contraindications

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

Caution

Liver and Kidney Yin deficiency (肝肾阴亏). Classical sources including Ben Cao Cong Xin specifically warn against use in patients with Yin deficiency of the Liver and Kidney, as this herb's dampness-draining nature can further deplete Yin fluids.

Avoid

Known allergy or hypersensitivity. Clinical reports document allergic reactions to Tu Fu Ling, including generalized skin itching and scattered red papules. Symptoms resolve upon discontinuation and recur upon re-exposure.

Caution

Avoid contact with iron implements during preparation. Classical texts including Wan Shi Jia Chao Fang state "bu fan tie qi" (do not contact iron vessels), as iron is believed to reduce the herb's efficacy.

Caution

Avoid drinking tea while taking this herb. The Ben Cao Gang Mu notes that tea should not be consumed during treatment with Tu Fu Ling, as tea may interfere with its detoxifying action.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

No specific classical prohibition against use during pregnancy. Tu Fu Ling is classified as neutral in temperature and non-toxic, and it does not have known uterine-stimulating or blood-moving properties. However, its dampness-draining nature means it should be used cautiously during pregnancy, especially in patients with underlying Yin deficiency. As with any herb during pregnancy, use only when clearly indicated and under the guidance of a qualified practitioner.

Breastfeeding

No specific classical or modern contraindication during breastfeeding has been documented. Tu Fu Ling is non-toxic and neutral in nature. There is no established data on transfer of its constituents into breast milk. Given the absence of safety data specific to lactation, it is advisable to use only when therapeutically necessary and at moderate doses under professional guidance.

Children

Tu Fu Ling has been used in traditional paediatric formulas for childhood malnutrition (疳积). Classical dosages for children are substantially lower, typically around 9g (3 qian) combined with other herbs. Dosage should be adjusted according to the child's age and body weight. Given the herb's non-toxic nature and bland flavour, it is generally well tolerated in children. However, use in very young infants should be under professional guidance.

Drug Interactions

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

No well-documented pharmaceutical drug interactions have been established through clinical studies. However, based on pharmacological research:

  • Immunosuppressants: Tu Fu Ling's active compound astilbin has demonstrated immunosuppressive and immunomodulatory effects in preclinical studies. Theoretically, concurrent use with immunosuppressive drugs (e.g. methotrexate, cyclosporine) may have additive effects. One preclinical study noted synergism between astilbin and methotrexate in arthritis models.
  • Uric acid-lowering drugs (allopurinol, febuxostat): Preclinical studies show Tu Fu Ling flavonoids inhibit xanthine oxidase and upregulate renal urate transporters. Concurrent use with pharmaceutical urate-lowering agents may have additive uric acid-lowering effects, potentially requiring dose adjustment.
  • Mercury compounds: Tu Fu Ling has a classical and well-documented role in counteracting mercury toxicity. This is a beneficial interaction historically, but is clinically irrelevant for modern pharmaceutical use.

Dietary Advice

Foods and dietary considerations when taking Tu Fu Ling

Classical texts advise against drinking tea while taking Tu Fu Ling, as tea is believed to interfere with its detoxifying actions. Avoid consuming "fa wu" (发物, trigger foods that may aggravate skin conditions or inflammatory responses), such as shellfish, chilli, alcohol, and heavily greasy or fried foods, especially when treating skin diseases or damp-heat conditions. The herb itself is sometimes prepared as a food, stewed with pork bones into a soup, which is a popular Cantonese medicinal dietary tradition.

Botanical Description

Physical characteristics and morphology of the Tu Fu Ling source plant

Smilax glabra Roxb. is a deciduous climbing shrub in the family Smilacaceae (sometimes classified under Liliaceae). It produces clumps of smooth, thornless, branching stems from a thick tuberous rhizome. The stems grow 1 to 4 metres long, climbing into surrounding vegetation by means of paired tendrils arising from the leaf sheaths. The leaves are alternate, thinly leathery, narrowly elliptic-lanceolate to narrowly ovate-lanceolate, 6 to 15 cm long and 1 to 7 cm wide, with a tapering tip and a rounded base. The undersides are usually pale green.

The plant is dioecious, bearing male and female flowers on separate individuals. Small greenish-white flowers appear in axillary umbels from May to November. The berries are 6 to 8 mm in diameter, ripening to blue-black with a powdery bloom from November to April. The medicinal rhizome is thick, irregular, and block-shaped, with individual tubers 2 to 5 cm in diameter connected by creeping stolons. The flesh is starchy and soft enough to eat raw. The plant thrives in warm, humid climates in forested mountain valleys and upland thickets, tolerating both shade and drought, in sandy or clay soils.

Sourcing & Harvesting

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

Harvesting season

Summer and autumn (夏、秋二季), per the Chinese Pharmacopoeia. The rhizomes are dug up, cleaned of rootlets, and either dried whole or sliced fresh and then dried.

Primary growing regions

Primarily produced in Guangdong, Hunan, Hubei, Zhejiang, Sichuan, and Anhui provinces of China. The herb is also native to northeast India, Bangladesh, Myanmar, Thailand, Laos, Cambodia, and Vietnam. Among Chinese sources, Guangdong and Hunan are traditionally considered the major producing regions. No single province holds a strong "dao di" (terroir) designation comparable to some other herbs, but southern Chinese provinces generally yield the best quality material due to the warm, humid climate the plant prefers.

Quality indicators

Good quality Tu Fu Ling slices are large, with a pale brownish (淡棕色) to off-white cross-section that is visibly starchy and powdery. When moistened with water, the cut surface should feel distinctly slippery and sticky to the touch. Small glistening sand-like bright spots (小亮点) should be visible on the cross-section, and these persist even after boiling. The herb should have minimal woody fibres (筋脉少). The taste is mildly sweet and slightly astringent, with little aroma. Between the two varieties (red and white cross-section), the white type is traditionally considered superior for medicinal use. Avoid pieces that are excessively fibrous, dark-centred, or lacking in starchy quality.

Classical Texts

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

Ben Cao Gang Mu 《本草纲目》 (Li Shizhen, Ming Dynasty)

Original: 健脾胃，强筋骨，去风湿，利关节，止泄泻。治拘挛骨痛；恶疮痈肿。解汞粉、银朱毒。

Translation: Strengthens the Spleen and Stomach, fortifies the sinews and bones, dispels wind-dampness, frees the joints, and stops diarrhoea. Treats cramping bone pain, malignant sores and carbuncles. Resolves mercury and cinnabar poisoning.

Ben Cao Zheng Yi 《本草正义》 (Zhang Shanlei, Qing Dynasty)

Original: 土茯苓，利湿去热，能入络，搜剔湿热之蕴毒。其解水银、轻粉毒者，彼以升提收毒上行，而此以渗利下导为务，故专治杨梅毒疮，深入百络，关节疼痛，甚至腐烂，又毒火上行，咽喉痛溃，一切恶症。

Translation: Tu Fu Ling drains dampness and clears heat. It can enter the network vessels and search out deep-lying damp-heat toxins. Its ability to resolve mercury and calomel poisoning works by draining and directing downward, and so it is specifically indicated for syphilitic sores that have penetrated deep into the hundred network vessels, causing joint pain, even ulceration, and toxic fire rising to the throat causing painful ulcers and all manner of severe conditions.

Ben Cao Shi Yi 《本草拾遗》 (Chen Cangqi, Tang Dynasty)

Original: 草禹余粮，根如盏连缀，半在土上，皮如茯苓，肉赤味涩，人取以当谷，不饥。……调中止泄。

Translation: Cao Yu Yu Liang [an early name for Tu Fu Ling]: its roots are like cups joined together, half above the soil, with bark like Fu Ling and reddish, astringent flesh. People gather it as a grain substitute to stave off hunger. It regulates the Middle Burner and stops diarrhoea.

Historical Context

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

Tu Fu Ling has a long history as both food and medicine in China. Its earliest recorded appearance as a medicinal substance is in Tao Hongjing's Ben Cao Jing Ji Zhu (Liang Dynasty, ~500 CE), where it was listed under the name "Yu Yu Liang" (禹余粮, "Provisions Left by [Emperor] Yu"). According to legend, the great flood-tamer Yu exhausted his food supplies while travelling through the mountains and survived by eating this starchy root, discarding the remainder. This origin story gave rise to its folk names "Xian Yi Liang" (仙遗粮, "Provisions Left by an Immortal") and "Leng Fan Tuan" (冷饭团, "Cold Rice Ball"), reflecting its importance as a famine food.

The name "Tu Fu Ling" first appeared in the Ming Dynasty text Dian Nan Ben Cao (滇南本草). However, it was Li Shizhen's Ben Cao Gang Mu (1578) that established "Tu Fu Ling" as the standard name and elevated the herb to prominence as a "key medicine" (要药). Li Shizhen documented how, during the Hongzhi and Zhengde periods (late 1400s to early 1500s), syphilis (杨梅疮, "Yang Mei Chuang") spread widely across China. Physicians treated it with mercury-based preparations like calomel (轻粉), which caused devastating mercury poisoning, leaving patients with joint contractures and festering ulcers. The discovery that Tu Fu Ling could both treat syphilis and counteract mercury toxicity transformed it into an essential medicine of the era.

Remarkably, Tu Fu Ling was also one of the first Chinese herbs to gain international recognition. By 1535, Portuguese traders were exporting it to India and Europe under the name "China Root" (Raiz da China), where it was used to treat syphilis. The Holy Roman Emperor Charles V reportedly used it, giving it considerable publicity across Europe. This early global trade in Tu Fu Ling represents a fascinating intersection of the Age of Exploration with Chinese medical knowledge.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Tu Fu Ling

1

Comprehensive Review: Traditional Usages, Phytochemical Constituents, Pharmacological Properties, and Clinical Applications of Smilax glabra Roxb. (2022)

Wu H, Wang Y, Zhang B, Li YL, Ren ZX, Huang JJ, Zhang ZQ, Lin ZJ, Zhang XM. Drug Design, Development and Therapy. 2022;16:3621-3643.

This review catalogued over 200 chemical compounds identified in Tu Fu Ling, including flavonoids (astilbin being the major active constituent at ~1-2% content), phenolic acids, stilbenes, and saponins. The review summarized evidence for anti-infective, anti-cancer, anti-inflammatory, antioxidant, and cardiovascular protective effects, noting that astilbin is used as the quality control marker in the Chinese Pharmacopoeia (minimum 0.45%). The authors noted a lack of clinical trials and called for more human studies.

PubMed
2

Anti-hyperuricemic Effect of Astilbin Stereoisomers from Smilax glabra on Hyperuricemic Mice (Preclinical, 2019)

Huang L, Deng J, Chen G, Zhou M, Liang J, Yan B, Shu J, Liang Y, Huang H. Journal of Ethnopharmacology. 2019;238:111777.

This study isolated four astilbin stereoisomers from Tu Fu Ling and tested their effects in a mouse model of hyperuricemia (high uric acid). The total flavonoid fraction significantly reduced serum uric acid levels, inhibited liver xanthine oxidase activity, and upregulated renal urate transporters OAT1 and OCTN2. These findings provide a pharmacological basis for the traditional use of Tu Fu Ling in treating gout-related conditions.

PubMed
3

Astilbin from Smilax glabra Attenuates Inflammatory Responses in Adjuvant-Induced Arthritis Rats (Preclinical, 2017)

Lu CL, Zhu W, Wang M, Xu XJ, Lu CJ. Evidence-Based Complementary and Alternative Medicine. 2017;2017:7248101.

In a rat model of rheumatoid arthritis, daily oral administration of astilbin (the main flavonoid from Tu Fu Ling) at 5.3 mg/kg reduced joint damage and significantly suppressed the inflammatory cytokines TNF-alpha, IL-1beta, and IL-6 at both mRNA and protein levels. The anti-inflammatory effect was comparable to the conventional drug leflunomide. The mechanism involved inhibition of the NF-kB signaling pathway via TLR/MyD88.

PubMed
4

Antioxidant and Anti-Inflammatory Activities of Six Flavonoids from Smilax glabra (In vitro, 2020)

Xu W, et al. Molecules. 2020;25(20):4728.

Six flavonoids were isolated and characterized from Tu Fu Ling: astilbin, neoastilbin, isoastilbin, neoisoastilbin, engeletin, and epicatechin. Five of the six showed strong antioxidant activity in DPPH, ABTS, and FRAP assays. All six significantly inhibited the secretion of inflammatory mediators IL-1beta, IL-6, and nitric oxide, and suppressed NF-kB p65 phosphorylation in LPS-stimulated macrophages.

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.