Herb

Yin Chai Hu

Stellaria root | 银柴胡

Also known as:

Yin Hu (银胡) , Starwort Root

Yin Chai Hu

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Properties

Heat-clearing herbs · Slightly Cool

Traditionally supports*

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

Parts Used

Root (根 gēn)

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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About This Herb

Traditional Chinese Medicine background and properties

Herb Description

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.

Herb Category

Heat-clearing herbs Herbs that clear Deficiency Heat (清虚热药)

Main Actions

  • 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 that reveal what's out of balance in the body. Yin Chai Hu is traditionally associated with these specific patterns.

The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.

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

TCM Properties

Temperature

Slightly Cool

Taste

Sweet (甘 gān)

Channels Entered
Liver Stomach
Parts Used

Root (根 gēn)

This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page

Product Details

Manufacturing, supplier, and product specifications

Product Type

Granules

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Botanical & Sourcing

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.

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.

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.

Supplier Information

Treasure of the East

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Miscellaneous Info

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Usage & Safety

How to use this herb and important safety information

Important Medical Disclaimer

The information provided here is for educational purposes only and is not intended as medical advice or to replace consultation with a qualified healthcare professional. This herb is a dietary supplement and has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease.

Always consult with a qualified healthcare provider, particularly if you are pregnant, nursing, have a medical condition, or are taking other medications. Discontinue use and consult your healthcare provider if you experience any adverse reactions.

Recommended Dosage

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Instructions for safe storage and consumption

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Traditional Dosage Reference

Standard

3–10g

Maximum

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.

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.

Toxicity Classification

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

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

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.

Pediatric Use

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

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

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.

Cautions & Warnings

Although this formula is typically safe for most individuals, it may cause side effects in some people. Pregnant women, nursing mothers, postpartum women, and those with liver disease should use the formula with caution.

As with any Chinese herbal remedy, it is advisable to seek guidance from a qualified TCM practitioner before beginning treatment.