Herb Root (根 gēn)

Tian Hua Fen

Trichosanthes root · 天花粉

Trichosanthes kirilowii Maxim. · Radix Trichosanthis

Also known as: Guā Lóu Gēn (栝楼根), Lóu Gēn (蒌根), Huā Fěn (花粉),

Tian Hua Fen (Trichosanthes root) plant

Images shown are for educational purposes only

Trichosanthes root is a cooling herb traditionally used to relieve thirst, dry cough, and skin infections. It is one of the most important herbs in Chinese medicine for conditions involving excessive thirst and depleted body fluids, including its classical use for the "wasting and thirsting" pattern that corresponds closely to diabetes. It also helps with hot, swollen skin abscesses by clearing heat and promoting the discharge of pus.

Category Heat-clearing herbs Herbs that clear Heat and drain Fire (清热泻火药)
Therapeutic focus Blood Sugar Support Respiratory Health Hydration and Thirst Relief Skin Health

TCM Properties

Temperature

Cool

Taste

Sweet (甘 gān), Bitter (苦 kǔ)

Channels entered

Lungs, Stomach

Parts used

Root (根 gēn)

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What This Herb Does

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

Therapeutic focus

In practical terms, Tian Hua Fen is primarily used to support these areas of health:

Blood Sugar Support Respiratory Health Hydration and Thirst Relief Skin Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Tian Hua Fen performs to restore balance in the body:

Clears Heat and Drains Fire Generates Fluids and Relieves Thirst Clears Heat and Moistens the Lungs Resolves Toxicity and Reduces Swelling Expels Pus

How these actions work

'Clears Heat and drains Fire' means Tian Hua Fen cools down excess warmth in the body, particularly in the Lung and Stomach systems. In practice, this applies to febrile illnesses with high fever and intense thirst, or conditions where internal heat has built up and is drying out the body's fluids. The herb's sweet and slightly bitter, cool nature makes it effective at both quenching internal heat and replenishing moisture.

'Generates fluids and relieves thirst' is perhaps the herb's most celebrated action. Classical texts describe it as a key remedy for thirst (治渴之要药). It is used when heat or fluid loss has left the mouth, throat, and digestive tract dry. This is why it features so prominently in formulas for the classical "wasting and thirsting" syndrome (消渴 xiāo kě), which broadly corresponds to diabetes. The herb helps the body produce and distribute fluids rather than simply adding moisture.

'Clears Lung Heat and moistens Lung dryness' refers to the herb's ability to address dry, unproductive coughing caused by heat damaging the Lungs. When the Lungs lose moisture, they cannot function properly, leading to a hacking cough with little or sticky phlegm, sometimes with traces of blood. Tian Hua Fen both cools the Lung heat and restores moisture to the Lung tissue.

'Resolves toxicity and expels pus' describes the herb's use in skin abscesses and boils. For swellings that have not yet come to a head, it helps reduce the inflammation. For those that have already formed pus but are not draining well, it promotes the discharge of pus so healing can begin. This action is always directed at "hot" type infections with redness, swelling, and pain.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Tian Hua Fen is used to help correct these specific patterns.

Why Tian Hua Fen addresses this pattern

Tian Hua Fen's sweet, slightly bitter, and cool nature makes it well suited for Lung Dryness patterns. When dryness or heat damages Lung fluids, the Lung loses its ability to descend and moisten, leading to dry cough with scant sticky phlegm. Tian Hua Fen enters the Lung channel, where it both clears residual heat and generates fluids to restore moisture to the Lung tissue. Its fluid-generating action directly addresses the root cause of this pattern rather than merely suppressing the cough.

A practitioner would look for one or more of these signs

Dry Cough

Dry, hacking cough with little or no phlegm

Dry Throat

Dry, scratchy throat

Sputum

Scant phlegm, sometimes streaked with blood

Thirst

Thirst with dry mouth

Commonly Used For

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

Arises from: Stomach Yin Deficiency Qi Level Heat

TCM Interpretation

TCM understands diabetes primarily through the classical concept of "wasting and thirsting" (消渴 xiāo kě), a condition characterised by excessive thirst, hunger, and urination. The root cause is typically a combination of Yin deficiency (the body's cooling, moistening resources are depleted) and internal heat (an unchecked warming tendency that evaporates fluids). The Lung, Stomach, and Kidney organ systems are all involved: the Lung fails to distribute fluids downward, the Stomach's heat burns through nourishment too quickly, and the Kidney cannot hold and recycle fluids properly. This creates a vicious cycle where the more fluid is consumed, the more is lost.

Why Tian Hua Fen Helps

Tian Hua Fen directly addresses two critical aspects of the diabetic pattern. First, its cool nature clears the Stomach and Lung heat that drives excessive thirst and fluid consumption. Second, its sweet taste actively generates fluids, helping to replenish the moisture that internal heat has depleted. A Taiwanese retrospective study found it to be the most frequently prescribed Chinese herb for type 2 diabetes patients. It serves as a Deputy herb in the classical formula Yu Ye Tang (Jade Fluid Decoction), where it partners with Zhi Mu to nourish Yin and moisten dryness while Huang Qi and Shan Yao address the underlying Qi deficiency. Modern research has identified trichosan A and lectin components with blood-sugar-regulating properties.

Also commonly used for

Chronic Bronchitis

When presenting with dry cough and Yin deficiency

Dry Mouth

Persistent dryness from fluid depletion or post-febrile states

Boils

With redness, swelling, and suppuration

Breast Abscess

Acute mastitis with heat toxicity

Chronic Pharyngitis

With dry throat and Yin deficiency of Lung and Stomach

Peptic Ulcer

Gastric and duodenal ulcers (traditional use with Bei Mu)

Jaundice

Damp-heat jaundice

Herb Properties

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

Temperature

Cool

Taste

Sweet (甘 gān), Bitter (苦 kǔ)

Channels Entered

Lungs Stomach

Parts Used

Root (根 gēn)

Dosage & Preparation

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

Standard dosage

10–15g

Maximum dosage

Up to 30g in standard decoction for severe Heat or thirst. Historical sources for treating diabetes (xiao ke) describe usage up to 60–90g, but such high doses require close practitioner supervision.

Dosage notes

Use lower doses (10–15g) for clearing Lung Heat, generating fluids, and treating dry cough. Higher doses (15–30g) may be used for pronounced thirst in febrile diseases or for wasting-thirst (xiao ke/diabetes) patterns. For treating abscesses, boils, and toxic swellings, moderate doses (10–15g) combined with Heat-clearing and toxin-resolving herbs are typical. When used in powder form (san ji), smaller amounts apply. The cold, moistening nature means doses should be kept conservative in patients with any tendency toward Spleen weakness or loose stools to avoid exacerbating digestive symptoms.

Preparation

No special decoction handling is required. Tian Hua Fen is decocted normally with other herbs. The standard dried root slices dissolve well in water due to their high starch content.

Common Herb Pairs

These ingredients are traditionally combined with Tian Hua Fen for enhanced therapeutic effect

Zhi Mu
Zhi Mu 1:1

Together, Tian Hua Fen and Zhi Mu powerfully nourish Yin, drain fire, and generate fluids. Zhi Mu clears heat from the Lung, Stomach, and Kidney while nourishing Yin, and Tian Hua Fen reinforces this with its own fluid-generating and heat-clearing actions focused on the Lung and Stomach. The pair addresses thirst from both the heat excess side and the fluid deficiency side simultaneously.

When to use: Febrile illness with damaged fluids causing intense thirst, or the wasting-thirsting (消渴) pattern with persistent thirst and internal heat.

Lu Gen
Lu Gen 1:1 (typically 10g each)

Both herbs clear heat and generate fluids, but Lu Gen (reed rhizome) is lighter and better at promoting urination and venting heat outward, while Tian Hua Fen is stronger at deeply generating fluids and moistening dryness. Together they clear Lung and Stomach heat while replenishing fluids from multiple angles.

When to use: Heat in the Lungs with cough and thick phlegm that is hard to expectorate, or early-stage febrile illness with thirst and mild dehydration.

Jin Yin Hua
Jin Yin Hua Jin Yin Hua 9–15g : Tian Hua Fen 10g

Jin Yin Hua (honeysuckle flower) is one of the strongest heat-clearing and toxin-resolving herbs, while Tian Hua Fen adds the ability to reduce swelling and expel pus. Together they create a potent combination for clearing heat toxins and dispersing painful swelling in abscesses and boils.

When to use: Early-stage abscesses and boils (yang-type sores) with redness, swelling, heat, and pain.

Tian Men Dong
Tian Men Dong 1:1

Tian Men Dong (asparagus root) is a rich Lung and Kidney Yin nourisher, while Tian Hua Fen clears Lung heat and generates Lung fluids. Together they strongly moisten the Lungs from both the nourishing (Tian Men Dong) and the cooling/fluid-generating (Tian Hua Fen) side, addressing dry cough more comprehensively than either herb alone.

When to use: Dry heat damaging the Lungs with dry cough, scant phlegm, or phlegm streaked with blood.

Key Formulas

These well-known formulas feature Tian Hua Fen in a prominent role

Sha Shen Mai Men Dong Tang 沙參麥門冬湯 Deputy

This formula from Wu Jutong's Wen Bing Tiao Bian treats dryness damaging the Lung and Stomach Yin. Tian Hua Fen serves as Deputy alongside Yu Zhu, boosting the fluid-generating and heat-clearing actions of the King herbs Sha Shen and Mai Dong. It perfectly showcases the herb's core identity as a Lung-Stomach fluid generator.

Yu Ye Tang 玉液湯 Deputy

Zhang Xichun's signature formula for the wasting-thirsting syndrome (diabetes). Tian Hua Fen serves as Deputy alongside Zhi Mu to nourish Yin and moisten dryness, directly addressing the thirst that is the cardinal symptom. This formula represents the herb's most well-known clinical application in modern practice.

Xian Fang Huo Ming Yin 仙方活命飲 Assistant

Known as 'the number-one formula for treating abscesses,' this formula from Jiao Zhu Fu Ren Liang Fang demonstrates Tian Hua Fen's pus-expelling and heat-clearing action in the surgical context. It works alongside Zhe Bei Mu to clear heat, soften hardness, and promote drainage of pus, showcasing the herb's role in treating toxic-heat skin conditions.

Comparable Ingredients

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

Lu Gen
Tian Hua Fen vs Lu Gen

Both Tian Hua Fen and Lu Gen (Phragmitis Rhizoma) clear heat and generate fluids for thirst. However, Tian Hua Fen is stronger at generating fluids and moistening dryness, making it better for chronic thirst and Yin-depleted conditions. Lu Gen is lighter and milder, better for the early stage of febrile illness where gentle fluid replenishment and venting of heat are needed. Tian Hua Fen also has the additional ability to expel pus from abscesses, which Lu Gen lacks.

Ge Gen
Tian Hua Fen vs Ge Gen

Both generate fluids and relieve thirst, but they work through very different mechanisms. Ge Gen (kudzu root) is acrid and cool, raising Spleen Yang to help fluids ascend and reach the mouth, which is why it excels in diabetes patterns with Qi deficiency. Tian Hua Fen is sweet, slightly bitter, and cool, working instead by clearing Stomach and Lung heat while directly generating fluids. They are often used together in formulas like Yu Ye Tang where both mechanisms are needed.

Shi Hu
Tian Hua Fen vs Shi Hu

Both nourish Stomach Yin and generate fluids. Shi Hu (Dendrobium) is a pure Yin-nourishing herb with a mild, sweet taste, better suited for chronic Yin deficiency without much active heat. Tian Hua Fen is more actively cooling and better at clearing heat while generating fluids, making it more appropriate when there is significant heat alongside the fluid depletion. Shi Hu also nourishes Kidney Yin, which Tian Hua Fen does not target.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Tian Hua Fen

Tian Hua Fen can be confused with or substituted by roots from other Trichosanthes species. The root of Trichosanthes cucumeroides (Wang Gua, 王瓜) is a known adulterant that was historically misused in place of genuine Tian Hua Fen. Other problematic substitutions include roots from T. cavaleriei (Chang Mao Gua) and T. hupehensis (Hu Bei Gua Lou), which may produce more side effects such as nausea and vomiting. The dried root slices may also be confused with Shan Yao (Chinese yam, Dioscorea opposita) or Ge Gen (Kudzu root, Pueraria lobata) due to superficial similarities in appearance. Genuine Tian Hua Fen can be distinguished by its characteristic radial "chrysanthemum" pattern on the cross-section, its starchy and slightly sticky texture when moistened, and its slightly bitter aftertaste. Historical sources note that some commercial products were bleached with sulphur to enhance whiteness.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Tian Hua Fen

Non-toxic

Tian Hua Fen is classified as non-toxic in the Chinese Pharmacopoeia when taken orally at standard doses. The key bioactive protein, trichosanthin (TCS), is a ribosome-inactivating protein (RIP) that is denatured by boiling in water and broken down by digestive enzymes in the gut. It therefore cannot be absorbed as an active protein from decoctions or oral preparations and is considered safe when consumed in standard herbal form. However, when trichosanthin is purified and administered by injection (intramuscular, intravenous, or intra-amniotic), it can cause significant adverse reactions including flu-like symptoms (fever, headache, sore throat, joint pain), skin rashes, and in rare cases severe allergic reactions including anaphylaxis, angioedema, chest tightness, and hypotension. Injected trichosanthin is also selectively toxic to placental trophoblast cells, which is the basis for its abortifacient use. At excessive oral doses, the herb may potentially burden liver and kidney function. A classical note from the Ben Jing states that roots grown in saline soil may carry toxicity.

Contraindications

Situations where Tian Hua Fen should not be used or requires extra caution

Avoid

Pregnancy. Tian Hua Fen contains trichosanthin, a protein that is highly toxic to trophoblast cells of the placenta, causing necrosis of syncytiotrophoblastic cells and disruption of placental circulation, leading to miscarriage. It has been historically used as an abortifacient in China.

Avoid

Incompatible with Wu Tou (Aconite root) and its processed forms including Fu Zi (Zhi Fu Zi). Tian Hua Fen, as a product of the Gua Lou (Trichosanthes) plant, falls under the Eighteen Incompatibilities (十八反): Wu Tou is incompatible with Gua Lou.

Caution

Spleen and Stomach deficiency cold with loose stools or diarrhea. The cold nature of Tian Hua Fen can further damage already weakened digestive function.

Caution

Phlegm conditions with white, clear, watery sputum (cold-phlegm). As noted in the Ben Jing Feng Yuan, cold-thin phlegm is not appropriate for this herb's cold, moistening nature.

Caution

Fluid loss after sweating or purging treatments. The Ben Cao Hui Yan warns against using this herb when thirst arises from fluid depletion due to sweating or purgation, rather than from internal Heat.

Caution

Yin deficiency with internal Heat where the thirst is due to depleted Yin fluids failing to ascend, rather than excess Heat consuming fluids. Requires careful differentiation before use.

Avoid

Known allergy to Trichosanthes kirilowii products. Some individuals may experience allergic reactions including skin rash, urticaria, or more severe hypersensitivity responses.

Caution

Severe heart, liver, or kidney disease with impaired organ function. Caution is advised as high doses may burden these organs.

Classical Incompatibilities

Traditional Chinese pharmacological incompatibilities — herbs or substances to avoid combining with Tian Hua Fen

Tian Hua Fen is incompatible with Wu Tou (乌头, Aconite) and its derivatives, including Chuan Wu (川乌), Cao Wu (草乌), and Fu Zi (附子, Aconiti Radix Lateralis Praeparata). This belongs to the Eighteen Incompatibilities (十八反): "乌头反贝母、瓜蒌、半夏、白蔹、白芨" — Aconite is incompatible with Bei Mu, Gua Lou (which includes Tian Hua Fen as the root of the same plant), Ban Xia, Bai Lian, and Bai Ji.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Absolutely contraindicated during pregnancy at all stages. Tian Hua Fen contains trichosanthin, a protein with well-documented abortifacient properties. Even when taken orally in decoction (where trichosanthin is largely denatured), the herb has traditionally been classified as a pregnancy-prohibited substance. The mechanism involves selective toxicity to placental syncytiotrophoblast cells, causing tissue necrosis, disruption of placental circulation, rapid decline in pregnancy hormones (HCG, progesterone), and subsequent uterine contractions leading to miscarriage. Additionally, the herb can directly stimulate uterine smooth muscle contraction and increase uterine sensitivity to oxytocin. This herb was used extensively in China from the 1960s onward as an injectable abortifacient for mid-term pregnancies with a success rate of approximately 95%.

Breastfeeding

Caution is advised. While trichosanthin (the main bioactive protein) is denatured during decoction and unlikely to transfer in active form through breast milk, there is insufficient safety data on use during lactation. The cold nature of the herb may theoretically affect milk production or cause digestive upset in nursing infants via changes in the mother's digestive function. Use only under practitioner guidance if considered necessary during breastfeeding.

Children

Tian Hua Fen may be used cautiously in children with appropriate dosage reduction based on age and body weight, typically one-third to one-half the adult dose. It is best suited for children presenting with clear signs of Heat patterns such as febrile illness with thirst and dry mouth. Avoid use in children with weak digestion (Spleen deficiency) or tendency to loose stools. Not generally recommended for very young children (under 3 years) without specific clinical indication and practitioner supervision.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Tian Hua Fen

Hypoglycaemic agents: Tian Hua Fen has demonstrated blood sugar-lowering effects in pharmacological studies. Concurrent use with insulin or oral hypoglycaemic drugs (metformin, sulfonylureas, etc.) may increase the risk of hypoglycaemia. Blood sugar should be monitored if used alongside diabetes medications.

Anticoagulant and antiplatelet drugs: Trichosanthin has been associated with effects on coagulation in the context of its placental tissue-damaging mechanism. Though this is primarily relevant to injected forms, caution is theoretically advised with warfarin, heparin, or similar drugs.

Immunosuppressants: Trichosanthin has demonstrated immunomodulatory activity. Patients taking immunosuppressive medications should use this herb with caution, as unpredictable immune interactions may occur.

Dietary Advice

Foods and dietary considerations when taking Tian Hua Fen

When taking Tian Hua Fen for Heat patterns with thirst or dry cough, favour light, cooling, and fluid-rich foods such as pears, watermelon, cucumber, and congee. Avoid spicy, greasy, fried, and excessively warming foods (lamb, chilli, ginger in large amounts, spirits) as these may counteract the herb's Heat-clearing and fluid-generating actions. Avoid excessively cold or raw foods if the patient has any underlying digestive weakness, as the herb's cold nature combined with cold foods may further impair Spleen function.

Botanical Description

Physical characteristics and morphology of the Tian Hua Fen source plant

Trichosanthes kirilowii Maxim. is a perennial herbaceous climbing vine of the Cucurbitaceae (gourd) family that can grow up to 10 metres in length. The stems are robust and multi-branched with longitudinal ridges, covered in white spreading hairs. The leaves are papery, roughly circular in outline (5–20 cm across), and typically 3 to 5-lobed (sometimes up to 7 lobes), with a heart-shaped base. The plant produces tendrils for climbing.

Flowering occurs from May to August, with distinctive white flowers. The fruit is a globose or oblong berry (the Gua Lou fruit) that ripens to orange-red or golden-yellow in autumn. The medicinal root (Tian Hua Fen) is a thick, fleshy, cylindrical tuber that grows deep underground, rich in starch, and pale yellowish-brown on the outside. The plant thrives in warm, moist environments at elevations of 200–1,800 metres, preferring deep, well-drained sandy loam soils. It is found growing on hillsides, in forest understories, among shrubs, in grasslands, and at field edges.

Sourcing & Harvesting

Where Tian Hua Fen is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Autumn and winter (best in late autumn, after the plant has stored starch in the root). Spring harvesting is also possible but produces lower quality with more fibre and less starch.

Primary growing regions

The most renowned terroir (dao di yao cai) for Tian Hua Fen is Henan Province, particularly the Anyang region, where it has long been known as "Anyang Hua Fen" (安阳花粉) and is recognised as a famous regional specialty herb with high output and superior quality. Hebei Province (especially Anguo) is another major producing area, where it is one of the "Eight Qi Herbs" (八大祁药). Other significant production regions include Anhui (Bozhou), Shandong, Jiangsu (Nantong, Yancheng), Guizhou, and Guangxi. The plant is widely distributed across most of China and is both wild-harvested and extensively cultivated.

Quality indicators

Good quality Tian Hua Fen root pieces are white to yellowish-white in colour, with a solid, heavy feel and high starch content (described as having good "powder quality" or fen xing). The cross-section should display a clearly visible radial pattern of vascular bundles sometimes described as a "chrysanthemum pattern" (ju hua wen). The texture should be firm and dense, difficult to break. Taste should be bland initially, then slightly bitter. The aroma is faint. Superior grade material is pure white, fine-textured, plump, and heavy with abundant starch. Inferior material is brownish in colour, fibrous, and lacking starchiness. Root harvested in autumn has better starch content than summer-harvested root, which tends to be more fibrous.

Classical Texts

Key passages from the classical Chinese medical texts that describe Tian Hua Fen and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

Chinese: 主消渴，身热，烦满，大热，补虚安中，续绝伤。

English: It treats wasting-thirst (xiao ke), body heat, vexation and fullness, great heat; it supplements deficiency, calms the centre, and mends severed injuries.

Ben Cao Gang Mu (《本草纲目》) — Li Shizhen

Chinese: 栝楼根，味甘微苦酸，酸能生津，故能止渴润枯，微苦降火，甘不伤胃，昔人只言其苦寒，似未深察。

English: The root of Gua Lou is sweet, slightly bitter, and sour. The sour flavour generates fluids, hence it stops thirst and moistens dryness. The slight bitterness directs fire downward, while the sweetness does not harm the Stomach. Past writers spoke only of its bitter and cold nature, which seems not to have been a thorough examination.

Ben Cao Hui Yan (《本草汇言》)

Chinese: 天花粉，退五脏郁热……乃治渴之要药也。

English: Tian Hua Fen clears depressed heat from the five Zang organs. When the Heart fire is exuberant causing dry tongue and mouth, when Lung fire causes sore throat, when Spleen fire causes mouth and gum swelling, when phlegm-fire causes incessant cough... it is a key medicinal for treating thirst. Combined with tonifying herbs it treats deficiency-thirst; with cooling herbs, fire-thirst; with Qi-regulating herbs, constraint-thirst; with Blood herbs, vexation-thirst.

Jing Yue Quan Shu (《景岳全书》)

Chinese: 最凉心肺，善解热渴，大降膈上热痰，消乳痈肿毒痔瘘疮疖，排脓生肌长肉……

English: It most cools the Heart and Lung, excellently resolves heat and thirst, powerfully descends hot phlegm above the diaphragm, disperses breast abscess, toxic swellings, haemorrhoids, fistulae, and sores, and expels pus while promoting tissue regeneration and flesh growth.

Historical Context

The history and evolution of Tian Hua Fen's use in Chinese medicine over the centuries

Tian Hua Fen has one of the longest recorded histories of any Chinese medicinal herb. Its earliest known documentation is in the Shen Nong Ben Cao Jing (circa 1st–2nd century CE), where the root was listed under its original name Gua Lou Gen (栝楼根) as a treatment for wasting-thirst and body heat. The name "Tian Hua Fen" (天花粉, literally "Heavenly Flower Powder") became the mainstream designation from the Song dynasty onward, following the Ben Cao Tu Jing. An older alias, "Bai Yao" (白药, "White Medicine"), appeared in the same Song-era text, while Li Shizhen in the Ben Cao Gang Mu added the poetic name "Rui Xue" (瑞雪, "Auspicious Snow"), referring to the pure white starchy powder extracted from the root.

Historically, the name "Tian Hua Fen" originally referred to the actual starch powder washed and precipitated from the fresh root, a labour-intensive process described in Sun Simiao's Qian Jin Fang (7th century). This powder, sometimes called "Yu Lu Shuang" (玉露霜, "Jade Dew Frost"), was prized for medicinal and cosmetic use. By later dynasties, as noted in the Ben Cao Zheng Yi, the term came to refer to dried root slices used directly in decoction: "there is the name of powder, but not the substance of powder."

One of the most remarkable chapters in this herb's history is its modern development as an abortifacient. Beginning in the 1960s in China, trichosanthin (the purified protein from the root) was developed into injectable preparations for inducing mid-term abortion, with a success rate reported around 95%. This research led to the purification of crystalline trichosanthin in 1982, which earned the Second Prize of China's National Invention Award. In 1989, trichosanthin drew international attention when it was found to inhibit HIV-1 replication, leading to clinical trials in the United States under the name "GLQ-223" or "Compound Q."

Modern Research

3 published studies investigating the pharmacological effects or clinical outcomes of Tian Hua Fen

1

A Sixty-Year Research and Development of Trichosanthin, a Ribosome-Inactivating Protein (Review, 2022)

Lu JQ, Wong KB, Shaw PC. Toxins (Basel). 2022;14(3):178.

A comprehensive review spanning 60 years of trichosanthin research. The paper traces the development from traditional use of Tian Hua Fen as an abortifacient, through protein purification in the 1970s-80s, to the discovery of anti-HIV activity in 1989 and anti-cancer potential. Trichosanthin functions as an rRNA N-glycosylase that inactivates ribosomes. Clinical studies showed over 95% success rate for mid-term abortion induction. Anti-HIV clinical trials were conducted in the US under the name GLQ-223/Compound Q, though antigenicity and short half-life limited further development.

2

Structural and Functional Investigation and Pharmacological Mechanism of Trichosanthin, a Type 1 Ribosome-Inactivating Protein (Review, 2018)

Shi WW, Wong KB, Shaw PC. Toxins (Basel). 2018;10(8):335.

This review details the molecular structure and pharmacological mechanisms of trichosanthin, a 27 kDa protein from the root of Trichosanthes kirilowii. It summarises evidence for abortifacient activity via selective destruction of placental trophoblast cells, anti-HIV activity through multiple mechanisms including inhibition of viral integration, and anti-tumour potential against several cancer cell lines. The paper also discusses immunomodulatory properties and ongoing challenges for clinical development.

3

Trichosanthin, a potent HIV-1 inhibitor, can cleave supercoiled DNA in vitro (Laboratory study, 1991)

Li XD, Chen WF, Liu WY, Wang GH. Nucleic Acids Research. 1991;19(22):6309-6312.

This study demonstrated that trichosanthin possesses DNA-cleaving activity in addition to its known ribosome-inactivating properties. The protein was shown to nick supercoiled double-stranded DNA, converting it to circular and linear forms. The paper confirmed trichosanthin contains one calcium ion per molecule, likely related to its endonucleolytic activity. This work helped elucidate additional mechanisms beyond ribosome inactivation that may contribute to the protein's antiviral effects.

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.