Herb Root (根 gēn)

Yin Chai Hu

Stellaria root · 银柴胡

Stellaria dichotoma L. var. lanceolata Bge. · Stellariae Radix

Also known as: Yin Hu (银胡), Starwort Root

Yin Chai Hu (Stellaria root) plant

Images shown are for educational purposes only

Stellaria root is a gentle cooling herb used in Chinese medicine to address persistent low-grade fevers and night sweats caused by the body's internal cooling reserves (Yin) being depleted. It is especially valued for treating childhood malnutrition with fever and is a key ingredient in Wu Ji Bai Feng Wan, one of the most widely used women's health formulas in China. Despite its name, Stellaria root (Yin Chai Hu) is completely unrelated to Bupleurum root (Chai Hu) and has very different uses.

Category Heat-clearing herbs Herbs that clear Deficiency Heat (清虚热药)
Therapeutic focus Low-Grade Fever Management Children's Health Hot Flashes and Night Sweats Menopausal support

TCM Properties

Temperature

Slightly Cool

Taste

Sweet (甘 gān)

Channels entered

Liver, Stomach

Parts used

Root (根 gēn)

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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 Yin Chai Hu does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Yin Chai Hu is primarily used to support these areas of health:

Low-Grade Fever Management Children's Health Hot Flashes and Night Sweats Menopausal support

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Yin Chai Hu performs to restore balance in the body:

Clears Deficiency Heat Clears Childhood Nutritional Impairment Heat Cools the Blood

How these actions work

'Clears deficiency Heat' means this herb addresses a specific type of low-grade, lingering fever that arises not from an infection, but from the body's own cooling reserves (Yin) being depleted. When Yin is insufficient, the body's warming functions go unchecked, producing symptoms like afternoon or evening fevers, feeling hot in the palms, soles, and chest (called 'five-centre heat'), night sweats, and a flushed face. Yin Chai Hu is considered a specialist for this type of Heat, particularly what classical texts call 'steaming bone disorder' (a deep-seated Heat felt in the bones). A key advantage of Yin Chai Hu is that it clears this Heat gently, without the harsh bitter-cold draining qualities of many other Heat-clearing herbs, making it less likely to further damage the already weakened Yin.

'Clears childhood malnutrition Heat' refers to a condition in Chinese paediatric medicine called 'gan ji' (疳积), where a child develops fever, irritability, thirst, abdominal distension, and emaciation due to poor nutrition or chronic digestive dysfunction. The Heat generated in this condition is a specific form of deficiency Heat, and Yin Chai Hu is considered one of the primary herbs for addressing it.

'Cools Blood' means that when Heat enters the Blood level of the body, it can cause the Blood to move recklessly outside its normal pathways, leading to various types of bleeding such as nosebleeds, blood in the urine, or abnormal uterine bleeding. Yin Chai Hu's gentle cooling action can help settle the Blood. Classical sources such as the Ben Jing Feng Yuan note that it 'not only clears Heat, but also cools Blood.'

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Yin Chai Hu is used to help correct these specific patterns.

Why Yin Chai Hu addresses this pattern

When Yin (the body's cooling, nourishing substances) becomes depleted, internal Heat arises unchecked. This leads to characteristic signs like afternoon or evening low-grade fever, night sweats, a sensation of heat in the palms and soles, and a thin rapid pulse. Yin Chai Hu is sweet and slightly cool, entering the Liver and Stomach channels. Its sweet flavour gently nourishes without further depleting Yin, while its cool nature directly addresses the deficiency Heat. Unlike bitter-cold herbs that can drain fluids and worsen Yin depletion, Yin Chai Hu clears Heat without damaging the body's reserves, making it ideal for this pattern. Classical texts describe it as able to 'clear Heat from the bone marrow' without the harsh draining effects of stronger cold herbs.

A practitioner would look for one or more of these signs

Night Sweats

Especially pronounced during sleep

Low Grade Fever

Afternoon or evening tidal fever

Menopausal Hot Flashes

Five-centre heat: palms, soles, and chest

Insomnia

Restlessness and irritability from internal Heat

Commonly Used For

These are conditions where Yin Chai Hu 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, the body's protective Qi (Wei Qi) moves inward. If Yin is insufficient and deficiency Heat is present, this inward movement of Qi causes Heat to push body fluids outward through the skin as sweat. The sweating typically stops upon waking because Wei Qi returns to the surface and re-establishes control. The pattern often involves the Liver and Kidney Yin being depleted, with Heat accumulating in the deeper layers of the body.

Why Yin Chai Hu Helps

Yin Chai Hu is slightly cool and sweet, entering the Liver and Stomach channels. It directly addresses the deficiency Heat that drives night sweats without the harsh bitter-cold draining action that could further deplete Yin. Its ability to clear Heat from deep within the body (what classical texts describe as clearing 'Heat from the bone marrow') makes it particularly suited for this type of sweating. It is frequently combined with herbs like Di Gu Pi (Lycium bark) and Qing Hao (Sweet Wormwood) for this purpose.

Also commonly used for

Low Grade Fever

Chronic or persistent low-grade fever from Yin Deficiency

Tuberculosis

Fever and wasting in tuberculosis (adjunctive use)

Malnutrition

Fever and emaciation from childhood malnutrition (gan ji)

Hematuria

Blood in urine from Blood Heat

Abnormal Uterine Bleeding

From Blood Heat patterns

Nosebleeds

Epistaxis from Blood Heat

Herb Properties

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

Temperature

Slightly Cool

Taste

Sweet (甘 gān)

Channels Entered

Liver Stomach

Parts Used

Root (根 gēn)

Dosage & Preparation

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

Standard dosage

3–10g

Maximum dosage

Generally not exceeding 10g in standard decoction. Some clinical references cite up to 15g under practitioner supervision for stubborn deficiency Heat, but this is not routine.

Dosage notes

Standard decoction dose is 3 to 10g. For mild Yin-deficiency Heat with low-grade afternoon fever, 3 to 6g is usually sufficient. For pronounced bone-steaming fever or childhood malnutrition Heat, 6 to 10g may be used. Yin Chai Hu clears Heat without bitter draining and is gentle on the Stomach, so it is suitable for patients with weak digestion who cannot tolerate strongly cold or bitter herbs. The processed form 'Bie Xue Yin Chai Hu' (鳖血银柴胡, turtle-blood-processed) enhances the herb's ability to enter the Yin level and clear deep deficiency Heat from the bones.

Preparation

No special decoction handling required. Decoct normally with other herbs. The root is typically sliced before decocting. For enhanced action on deep-level deficiency Heat, the turtle-blood-processed form (Bie Xue Yin Chai Hu, 鳖血银柴胡) may be used.

Common Herb Pairs

These ingredients are traditionally combined with Yin Chai Hu for enhanced therapeutic effect

Di Gu Pi
Di Gu Pi 1:1 (e.g. Yin Chai Hu 6g : Di Gu Pi 6g)

Yin Chai Hu and Di Gu Pi (Lycium bark) together form a powerful combination for clearing deficiency Heat. Yin Chai Hu specialises in clearing deep-seated Heat from the bones (bone-steaming Heat), while Di Gu Pi excels at descending Lung Heat and addressing deficiency Heat with sweating. Together they address deficiency Heat comprehensively from different angles.

When to use: Recurring afternoon fever from Yin Deficiency, especially when accompanied by night sweats and heat in the palms and soles.

Hu Huang Lian
Hu Huang Lian 1.5:1 (e.g. Yin Chai Hu 5g : Hu Huang Lian 3g, as in Qing Gu San)

Yin Chai Hu clears deficiency Heat gently from the Liver and Stomach without damaging Yin, while Hu Huang Lian (Picrorhiza) enters the Blood level to clear deeper-seated Heat. Together they clear deficiency Heat more powerfully than either alone, and both address childhood malnutrition Heat (gan ji). This is the core pairing in Qing Gu San.

When to use: Steaming bone disorder with pronounced tidal fever and night sweats, or childhood malnutrition with fever and emaciation.

Qing Hao
Qing Hao 1:1 (e.g. Yin Chai Hu 5g : Qing Hao 5g)

Yin Chai Hu clears deficiency Heat from within, while Qing Hao (Sweet Wormwood) has a unique ability to reach into the Yin level and vent Heat outward to the surface. The combination clears Heat both by cooling it internally and by venting it externally, making it more effective than either herb alone.

When to use: Chronic low-grade fever or tidal fever from Yin Deficiency, especially when Heat feels trapped deep inside the body.

Bie Jia
Bie Jia 1:1.5 (e.g. Yin Chai Hu 6g : Bie Jia 9g)

Yin Chai Hu clears deficiency Heat while Bie Jia (Turtle Shell) nourishes Yin and anchors floating Yang. Together they both clear the Heat and address its root cause (Yin Deficiency), providing a more complete therapeutic effect. Bie Jia also helps guide the cooling action deeper into the body.

When to use: Yin Deficiency with steaming bone Heat, dry skin, emaciation. The classical formula Yin Jia San pairs these two herbs for this purpose.

Key Formulas

These well-known formulas feature Yin Chai Hu in a prominent role

Qing Gu San 清骨散 King

The definitive formula showcasing Yin Chai Hu's core action. From the Zheng Zhi Zhun Sheng (Standards of Diagnosis and Treatment), Qing Gu San is the primary formula for steaming bone disorder from Yin Deficiency. Yin Chai Hu serves as King at the highest dose (5g vs 3g for others), demonstrating its central role in clearing deficiency Heat from the bones without damaging Yin.

Comparable Ingredients

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

Di Gu Pi
Yin Chai Hu vs Di Gu Pi

Both Yin Chai Hu and Di Gu Pi clear deficiency Heat and are classified together under 'deficiency Heat-clearing herbs.' Di Gu Pi is stronger at descending Lung Fire and is better suited when deficiency Heat manifests with cough or wheezing. It also has a Blood-cooling action for bleeding from Heat. Yin Chai Hu is more specialised for deep bone-steaming Heat and childhood malnutrition fever. Di Gu Pi is better when there are clear sweating symptoms; Yin Chai Hu is better when the focus is on bone-deep Heat. They can substitute for one another in many clinical situations and are often combined.

Chai Hu
Yin Chai Hu vs Chai Hu

Despite sharing a name, Yin Chai Hu (Stellaria root, Caryophyllaceae family) and Chai Hu (Bupleurum root, Apiaceae family) are completely different plants with different actions. Chai Hu is acrid and ascending, used to release exterior Heat, harmonise the Shao Yang, soothe Liver Qi stagnation, and raise sunken Yang. Yin Chai Hu has no dispersing or rising quality whatsoever, no ability to release the exterior or soothe the Liver. It only clears internal deficiency Heat. Using Chai Hu for Yin Deficiency Heat can worsen the condition by raising and scattering what little Yin remains.

Hu Huang Lian
Yin Chai Hu vs Hu Huang Lian

Both Yin Chai Hu and Hu Huang Lian clear deficiency Heat and childhood malnutrition Heat. The key difference is their nature: Yin Chai Hu is sweet and slightly cool, making it gentler and less likely to damage the Stomach; Hu Huang Lian is bitter and cold, giving it stronger Heat-clearing power but also a greater tendency to injure the Spleen and Stomach. Hu Huang Lian also clears Damp-Heat more effectively. When the patient is already weak with poor appetite, Yin Chai Hu is the safer choice.

Therapeutic Substitutes

Legitimate clinical replacements when Yin Chai Hu is unavailable, restricted, or contraindicated

Di Gu Pi

Di Gu Pi
Di Gu Pi 地骨皮
Chinese Wolfberry Root Bark

Covers: Covers Yín Chái Hú's primary action of clearing deficiency heat — including bone-steaming disorder, chronic low-grade fever, and tidal fever from Yin deficiency. Multiple Chinese clinical sources explicitly document that the two herbs can substitute for each other (二者可以互代) for this indication.

Does not cover: Dì Gǔ Pí has a stronger blood-cooling action and is traditionally preferred when deficiency heat is accompanied by spontaneous or night sweating. It also enters the Lung channel and can help with consumptive cough and hemoptysis, giving it a somewhat different profile. It does not cover Yín Chái Hú's action of clearing childhood nutritional accumulation fever (疳热). Note: Dì Gǔ Pí appears as a co-ingredient alongside Yín Chái Hú in Qīng Gǔ Sǎn — when that formula is the treatment strategy, Dì Gǔ Pí is a complement, not a substitute.

Use when: When Yín Chái Hú is unavailable or of poor quality, and the clinical picture is straightforward Yin-deficiency fever or bone-steaming disorder without a specific need to address childhood nutritional impairment. Particularly appropriate when there is an additional need to cool the Blood or address Lung-heat with cough.

Identity & Adulterants

Related species and common adulterations to be aware of when sourcing Yin Chai Hu

Several other Caryophyllaceae roots are commonly confused with or substituted for authentic Yin Chai Hu, collectively called 'Shan Yin Chai Hu' (山银柴胡, mountain Yin Chai Hu). These are considered inferior in quality. The main adulterants include: 1. Si Shi Zhu (丝石竹, Gypsophila oldhamiana): root is flattened, cylindrical, with bark removed showing brown-white striped patterns. Taste is bitter and numbing (authentic Yin Chai Hu tastes mildly sweet). 2. Zhui Hua Si Shi Zhu (锥花丝石竹, Gypsophila paniculata): cylindrical root with pale yellow surface. Taste is sweet. 3. Deng Xin Cao Zao Que (灯心蚤缀, Arenaria juncea): conical root with grey-brown surface and dense fine ring-like markings at the top. Cross-section shows white bark and yellow wood. Taste is slightly bitter and pungent. 4. Ying Zi Cao (蝇子草, Silene fortunei): mixed in as Yin Chai Hu in Shaanxi and Gansu provinces. Authentic Yin Chai Hu can be distinguished by: the characteristic 'Zhenzhupan' (pearl plate) at the root crown, 'Shayan' (sand eyes) on the surface, calcium oxalate sand crystals (not cluster crystals) visible microscopically, and a mildly sweet (not bitter or numbing) taste. It should also not be confused with Chai Hu (Bupleurum chinense or B. scorzonerifolium), which belongs to a completely different plant family (Apiaceae) with different properties.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Yin Chai Hu

Non-toxic

Yin Chai Hu is classified as non-toxic in the Chinese Pharmacopoeia and has no special toxicity warnings. It contains beta-carboline alkaloids, cyclic peptides, sterols, flavonoids, and phenolic acids. At standard therapeutic doses (3 to 10g in decoction), no significant adverse effects have been reported. No specific toxic components requiring special processing or dose limitation have been identified.

Contraindications

Situations where Yin Chai Hu should not be used or requires extra caution

Avoid

External pathogen (Wind-Cold or Wind-Heat) causing fever. Yin Chai Hu clears deficiency Heat only and has no exterior-releasing action. Using it for externally contracted fever would be ineffective and could potentially trap the pathogen inside.

Caution

Spleen and Stomach deficiency Cold with no signs of Yin-deficiency Heat. As a cool, Yin-directed herb, it may further weaken already-cold digestive function.

Caution

Blood deficiency without Heat signs. Although Yin Chai Hu cools the Blood, it does not nourish Blood. Using it in pure Blood deficiency without deficiency Heat may deplete the body further.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Yin Chai Hu is not listed among the 99 pregnancy-prohibited or pregnancy-caution herbs in the Chinese Pharmacopoeia. Its mild, sweet, and slightly cool nature makes it relatively safe in profile. However, because its primary action is clearing deficiency Heat and cooling Blood, and because systematic reproductive toxicity studies are lacking, pregnant women should use it only when clearly indicated and under practitioner guidance. There is no known specific mechanism of concern (no uterine-stimulating or teratogenic effects reported).

Breastfeeding

No specific safety data exists for Yin Chai Hu during breastfeeding. It is not listed as contraindicated during lactation in standard references. Its mild, sweet, slightly cool nature and non-toxic classification suggest a low risk profile. However, as with most herbs lacking specific lactation safety studies, it should be used only when clinically indicated and under practitioner supervision.

Children

Yin Chai Hu has a long traditional history of use in pediatric practice, particularly for childhood malnutrition fever (xiao er gan re, 小儿疳热). Children's doses should be reduced proportionally based on age and body weight, typically one-third to one-half of the adult dose for younger children. Its mild, sweet flavour and non-toxic classification make it relatively well-tolerated in pediatric use. Always use under practitioner guidance.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Yin Chai Hu

No well-documented pharmaceutical drug interactions have been established for Yin Chai Hu. Its primary active constituents include beta-carboline alkaloids, sterols, cyclic peptides, and flavonoids. While beta-carboline alkaloids have been shown to interact with monoamine oxidase (MAO) in laboratory settings, the concentrations present in standard decoctions of Yin Chai Hu are unlikely to reach pharmacologically significant levels. As a precautionary measure, individuals taking MAO inhibitors should consult their healthcare provider before using this herb.

No interactions with anticoagulants, antihypertensives, or other common drug classes have been specifically reported for this herb.

Dietary Advice

Foods and dietary considerations when taking Yin Chai Hu

When taking Yin Chai Hu for Yin-deficiency Heat, avoid hot, spicy, fried, or drying foods (such as chilli peppers, deep-fried foods, lamb, and strong alcohol), as these can aggravate internal Heat and counteract the herb's cooling action. Favour foods that nourish Yin and generate fluids, such as pears, lily bulbs, white fungus (tremella), and lean soups.

Botanical Description

Physical characteristics and morphology of the Yin Chai Hu source plant

Stellaria dichotoma L. var. lanceolata Bge. is a perennial herbaceous plant in the Caryophyllaceae (pink) family. The stem grows 15 to 60 cm tall, is branched and covered in fine hairs (pubescent). The leaves are small, up to 2.5 cm long and 1 cm wide, ovate to lanceolate-ovate in shape, pubescent on both surfaces. The inflorescence bears numerous small white flowers, each with five petals that are deeply notched at the tip. The fruit is a capsule containing 1 to 5 brownish-black, slightly compressed, round seeds.

The plant is extremely hardy, thriving in arid and semi-arid conditions at elevations of 1,250 to 3,100 metres. It grows naturally on rocky slopes, dry grasslands, and desert-steppe environments, tolerating temperatures as low as -30°C, annual rainfall below 200 mm, and poor sandy soils with very low organic content. The medicinal root is thick, cylindrical, and can reach 15 to 40 cm in length, developing characteristic features over 3 or more years of growth.

Sourcing & Harvesting

Where Yin Chai Hu is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Spring or summer when the plant first sprouts, or in autumn after the stems and leaves have withered. Cultivated plants are typically harvested in mid-September of the third year or mid-April of the fourth year after planting.

Primary growing regions

The traditional dao di (terroir) production region is the border area where Shaanxi, Inner Mongolia, and Ningxia provinces meet, as well as the central Ningxia arid sandy belt and areas to its north. The highest-quality herb has historically come from this region, originally associated with ancient Yin Province (银州, near modern Yulin, Shaanxi). Specifically, the key production counties in Ningxia include Taole, Yanchi, Lingwu, Zhongwei, Tongxin, and surrounding areas. The plant also grows wild in Gansu, Inner Mongolia, Liaoning, and Hebei. Ningxia is recognized as the primary dao di production region in national standards, and cultivated production has been expanding there since the 1980s.

Quality indicators

Good quality wild Yin Chai Hu root is cylindrical, 15 to 40 cm long and 0.5 to 2.5 cm in diameter, with a pale brownish-yellow surface showing twisted longitudinal wrinkles. Key identifying features include: (1) 'Zhenzhupan' (珍珠盘, 'pearl plate') at the root head, which is a cluster of densely packed, wart-like bud remnants; (2) 'Shayan' (砂眼, 'sand eyes'), small pitted or disc-shaped depressions on the surface from which fine sand grains can be seen when broken open. The cross-section should show alternating yellow and white radial striations, with a very thin bark layer. The texture is hard but brittle and breaks easily. The taste should be mildly sweet, with a faint aroma. Cultivated roots tend to be thinner (0.6 to 1.2 cm), with finer longitudinal wrinkles, fewer or no sand eyes, and a denser cross-section that is slightly powdery. Wild roots are traditionally considered superior due to higher total sterol and flavonoid content.

Classical Texts

Key passages from the classical Chinese medical texts that describe Yin Chai Hu and its therapeutic uses

《本经逢原》(Ben Jing Feng Yuan) by Zhang Lu, Qing Dynasty

Original: 银柴胡，其性味与石斛不甚相远。不独清热，兼能凉血。……凡人虚劳方中，惟银州者为宜，若用北柴胡，升动虚阳，发热喘嗽，愈无宁宇，可不辨而混用乎！

Translation: Yin Chai Hu has properties and flavour not far from those of Shi Hu (Dendrobium). It not only clears Heat but also cools the Blood. In formulas for consumptive deficiency, only the variety from Yin Province is appropriate. If one uses Bei Chai Hu (northern Bupleurum) instead, it will stir up deficient Yang, causing fever and panting cough with no relief. How can one fail to distinguish and use them interchangeably!

《本草便读》(Ben Cao Bian Du)

Original: 银柴胡，无解表之性。从来注《本草》者，皆言其能治小儿疳热，大人痨热，大抵有入肝胆凉血之功。

Translation: Yin Chai Hu has no exterior-releasing properties. Commentators on the materia medica have always said it can treat childhood malnutrition fever and adult consumptive fever. In general, it has the function of entering the Liver and Gallbladder channels to cool the Blood.

《本草正义》(Ben Cao Zheng Yi) by Zhang Shanlei

Original: 治虚热骨蒸，自有实效，断非北柴胡之升阳泄汗可比……退热而不苦泄，理阴而不升辟，固虚热之良药。

Translation: For treating deficiency Heat and steaming bone disorder, it has real efficacy, and is absolutely not comparable to Bei Chai Hu's Yang-raising and sweat-promoting action. It reduces fever without bitter draining, regulates Yin without ascending or dispersing. It is truly an excellent medicine for deficiency Heat.

《本草纲目》(Ben Cao Gang Mu) citing Pang Yuanying's 'Tan Sou'

Original: 此名劳疟，热从髓出……非柴胡不可。若得银柴胡，只须一服。

Translation: This is called consumptive malaria; the heat emerges from the marrow. Nothing but Chai Hu can treat it. If one obtains Yin Chai Hu, only a single dose is needed.

Historical Context

The history and evolution of Yin Chai Hu's use in Chinese medicine over the centuries

The name "Yin Chai Hu" (银柴胡, literally "silver Bupleurum") derives from Yin Province (银州), an ancient administrative region near modern Yulin in Shaanxi province. The earliest mention appears in the Lei Gong Pao Zhi Lun (雷公炮炙论, Southern Dynasties period, c. 420-470 CE), which noted that the best Chai Hu came from "Yin Province." For centuries, Yin Chai Hu and Chai Hu (Bupleurum) were used interchangeably or confused, as the name originally meant "Chai Hu from Yin Province" rather than a distinct drug.

The differentiation between the two herbs progressed through three historical phases. From the Tang through Yuan dynasties, they were mixed and used without clear distinction. During the Ming and Qing dynasties, physicians such as Miu Xiyong (缪希雍, author of Ben Cao Jing Shu) and Zhang Lu (张璐, author of Ben Jing Feng Yuan) began to argue forcefully that Yin Chai Hu was fundamentally different from Bei Chai Hu (northern Bupleurum) in both form and function. Zhang Lu, in particular, is credited with championing the separate use of the two herbs, warning that substituting Bei Chai Hu for Yin Chai Hu in consumptive deficiency formulas would dangerously stir up deficient Yang. The Ben Cao Gang Mu Shi Yi (本草纲目拾遗) by Zhao Xuemin of the Qing Dynasty definitively established Yin Chai Hu as a separate medicinal material.

In the modern era, the 1963 edition of the Chinese Pharmacopoeia formally listed Yin Chai Hu as an independent drug entry for the first time, confirming its botanical source as the Caryophyllaceae plant Stellaria dichotoma var. lanceolata, entirely distinct from Bupleurum. All subsequent editions have maintained this distinction. A popular folk story tells of a travelling physician who resolved a dispute by demonstrating that the white-rooted "silver" Chai Hu from Yin Province was suited for deficiency fever, while ordinary Chai Hu was better for exterior conditions, giving rise to the name.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Yin Chai Hu

1

Beta-Carboline Alkaloids with Antiallergic Activity from Stellaria dichotoma (In vitro/In vivo, 2004)

Morita H, Kayashita T, Kobata H, Gonda A, Takeya K, Itokawa H. J Nat Prod. 2004;67(10):1677-80.

This study isolated six new beta-carboline-type alkaloids (dichotomines A-D, dichotomides I-II) from the roots of Stellaria dichotoma. The extract demonstrated antiallergic effects in a mouse passive cutaneous anaphylaxis (PCA) model in vivo, and one compound (dichotomine C) showed inhibitory activity against beta-hexosaminidase release in mast cells (IC50 = 62 microM), as well as suppression of TNF-alpha and IL-4 release, which are mediators of late-phase allergic reactions.

PubMed
2

Beta-Carboline Alkaloids from Stellaria dichotoma var. lanceolata and Their Anti-inflammatory Activity (In vitro, 2011)

Zhou Y, Jiang SY, Ma TT, et al. J Nat Prod. 2011;74(5):1090-5.

Researchers isolated 21 beta-carboline alkaloids from the roots, including 13 new compounds. Five of the tested alkaloids significantly inhibited nitric oxide (NO) production in LPS-stimulated RAW 264.7 macrophage cells, with IC50 values ranging from 11.3 to 19.3 microM, demonstrating notable anti-inflammatory potential.

Link
3

Protective Effects of Stellaria dichotoma var. lanceolata Extract Against Mycobacterium abscessus Infection (Preclinical, 2018)

Bae M, Kim H, Moon K, et al. PLoS One. 2018;13(11):e0207696.

This study found that an ethanol extract of Stellaria dichotoma var. lanceolata roots showed significant anti-inflammatory activity in a mouse model of Mycobacterium abscessus infection, reducing inflammatory markers through suppression of NF-kB and MAPK signaling pathways. The findings support the traditional use of the herb for managing inflammatory conditions.

Link
4

Impact of Growth Years on Medicinal Material Characteristics and Metabolites of Stellaria dichotoma var. lanceolata (Metabolomics, 2023)

Li Z, Feng L, Wang H, et al. Molecules. 2023;28(13):4906.

Using UHPLC-Q-TOF MS metabolomics, this study compared roots of 1 to 5 year old cultivated plants. Results showed that medicinal material quality characteristics and metabolite accumulation increased with growth years, with the fastest development in the first 3 years, after which it slowed. This provides evidence for optimal harvest timing at 3 to 4 years.

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.