Herb

Yu Zhu

Solomon's seal rhizome | 玉竹

Also known as:

Polygonatum Rhizome , Fragrant Soloman Seal

Yu Zhu

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Properties

Yin-tonifying herbs (补阴药) · Slightly Cool

Traditionally supports*

Respiratory Health Digestive Health Skin Hydration Blood Sugar Support

Parts Used

Rhizome (根茎 gēn jīng)

*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

Yu Zhu is a gentle, moistening herb from the Solomon's seal plant, prized for replenishing the body's fluids when dryness is the main problem. It is commonly used for dry cough, dry or sore throat, persistent thirst, and skin dryness, and is mild enough to be used in everyday soups and teas as well as in medicinal formulas.

Herb Category

Yin-tonifying herbs (补阴药)

Main Actions

  • Nourishes Yin and Moistens Dryness
  • Generates Fluids and Relieves Thirst
  • Extinguishes Wind and Stops Spasms

How These Actions Work

'Nourishes Yin and moistens dryness' means Yu Zhu replenishes the body's cooling, moistening fluids, particularly in the Lungs and Stomach. When these organs become too dry (from illness, dry weather, or chronic fluid loss), symptoms like dry cough with little phlegm, dry throat, and a parched mouth appear. Yu Zhu's sweet, moist, slightly cool nature gently restores this moisture. It is notably gentle and non-cloying, meaning it nourishes without creating sluggish digestion, making it suitable for longer-term use and for people with delicate constitutions.

'Generates fluids and quenches thirst' refers to Yu Zhu's ability to promote the body's own production of healthy fluids. This is especially relevant in conditions where excessive internal heat burns up fluids, causing intense thirst, excessive hunger despite eating, and a dry mouth. In TCM, this pattern closely relates to what is called Xiao Ke (wasting and thirsting), which overlaps significantly with diabetes in modern terms. Yu Zhu is frequently combined with herbs like Shi Gao, Zhi Mu, and Tian Hua Fen when this pattern involves strong Stomach Heat.

'Extinguishes Wind and softens the sinews' means that when fluids are severely depleted, the body's tendons and muscles lose their nourishment, leading to stiffness, cramping, spasms, or dizziness. By restoring fluids from within, Yu Zhu indirectly calms this type of internally generated Wind. This action also makes Yu Zhu useful in people with underlying Yin deficiency who catch a Wind-Heat or Wind-Warmth illness, as it supports the body's fluids while other herbs expel the pathogen, without trapping the illness inside.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Yu zhu 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 Yu zhu addresses this pattern

When the Lungs lack sufficient Yin (the cooling, moistening aspect), they become dry and irritated, producing a persistent dry cough with little or no phlegm, a scratchy or sore throat, and a hoarse voice. Yu Zhu enters the Lung channel and is sweet and slightly cool in nature. Its sweet taste nourishes and generates fluids, while its cool nature gently clears residual Heat without being too cold. This directly replenishes the Lung's lost moisture, calming the dry cough and soothing the irritated airways. Compared to stronger Yin tonics like Mai Dong or Tian Dong, Yu Zhu is less cloying, so it nourishes without creating digestive stagnation.

A practitioner would look for one or more of these signs

Dry Cough

Dry cough with little or no phlegm

Sore Throat

Dry, scratchy throat

Hoarseness

Hoarse or weak voice

Dry Mouth

Dry mouth and lips

TCM Properties

Temperature

Slightly Cool

Taste

Sweet (甘 gān)

Channels Entered
Lungs Stomach
Parts Used

Rhizome (根茎 gēn jīng)

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 Yu Zhu rhizome slices should be long, thick, and fleshy, with a yellowish-white to pale golden colour and a semi-transparent, lustrous appearance. The texture should be firm when dry but become pliable when slightly moistened. The taste should be distinctly sweet and sticky when chewed (嚼之发黏). The aroma should be mild and clean. Avoid pieces that are dark, wrinkled, or dry and brittle (indicating poor processing), excessively white (suggesting sulphur fumigation), or thin and hollow. The best grade (Xiang Yu Zhu from Hunan) shows a waxy, translucent cross-section with a horn-like quality.

Primary Growing Regions

The premier terroir (道地药材) region for Yu Zhu is Shaoyang, Hunan Province (especially Liuze Township in Shaodong), where the cultivated product known as 'Xiang Yu Zhu' (湘玉竹) has been produced for over 200 years. This region's unique dry-heat microclimate within otherwise humid Hunan, combined with loose sandy yellow soil, produces rhizomes that are especially thick, lustrous, and high in polysaccharide content. Other important producing regions include Zhejiang, Jiangsu (Haimen, known as 'Jiangbei Yu Zhu'), Anhui (Anqing and Tongling, known as 'An Yu Zhu'), Hebei (Fengrun, Yutian), and the northeastern provinces of Heilongjiang, Jilin, and Liaoning (collectively known as 'Guan Yu Zhu'). Wild Yu Zhu also grows across temperate Eurasia, from Europe through Siberia to East Asia.

Harvesting Season

Autumn (also spring in some regions). The rhizome is typically harvested after 3 years of growth, when polysaccharide content is highest.

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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Traditional Dosage Reference

Standard

6-12g

Maximum

Up to 15-30g in cases of severe Yin Deficiency with marked dryness, under practitioner guidance. Some classical sources suggest that for chronic use as a tonic, larger amounts may be taken in pill or paste form over extended periods.

Notes

Use raw Yu Zhu (生玉竹) at standard doses of 6-12g for clearing Heat and nourishing Yin in conditions with more pronounced Heat signs. Steamed or prepared Yu Zhu (制玉竹/蒸玉竹) is preferred for pure tonification of Yin without significant Heat. For chronic Yin-deficiency patterns, prepared pills or pastes using larger amounts are traditionally recommended for sustained effect, as the herb's action is gentle and cumulative. When used in the Jia Jian Wei Rui Tang formula for exterior Wind-Warmth with Yin Deficiency, a dose of 6-9g is typical. For Stomach Yin Deficiency with significant thirst, doses toward the higher end of the range (10-12g) are preferred.

Processing Methods

Processing method

The washed rhizome is placed in a steamer and steamed 2 to 3 times until the interior and exterior are uniformly black in color, then dried to half-dry, sliced, and fully dried.

How it changes properties

Steaming shifts the herb's nature from slightly cool toward neutral or slightly warm, and enhances its tonifying and nourishing properties while reducing its Heat-clearing capacity. The steamed form becomes more purely a Yin tonic, focused on deep nourishment rather than clearing Heat.

When to use this form

Choose steamed Yu Zhu (Zhi Yu Zhu) for chronic consumptive conditions, recovery from prolonged illness, and cases of Yin deficiency without significant active Heat. It is better suited for long-term tonification of the Middle Burner and replenishing fluids in later stages of warm-febrile diseases.

Toxicity Classification

Non-toxic

Yu Zhu is classified as non-toxic in the Chinese Pharmacopoeia and has a long history of safe use as both medicine and food (it is on the official 'medicine-food dual use' list). At standard dosages there are no significant toxic concerns. Overdose may occasionally cause mild gastrointestinal discomfort such as nausea or loose stools due to its moistening nature. The berries and above-ground parts of the plant are not used medicinally and may be mildly toxic if consumed in large quantities.

Contraindications

Caution

Phlegm-Dampness obstruction of the Stomach or Spleen (痰湿气滞). Yu Zhu is a moistening, Yin-nourishing herb that can worsen conditions where Dampness or Phlegm is already accumulating. People with a thick greasy tongue coating, bloating, or loose stools due to Dampness should avoid it.

Caution

Spleen-Yang Deficiency with diarrhea. The slightly cold nature of Yu Zhu can further impair weak digestive function, potentially worsening loose stools and poor appetite in people with cold, weak digestion.

Caution

Internal Cold from Yin patterns (阴病内寒). As stated in the Ben Cao Chong Yuan: 'For Yin-type diseases with internal Cold, this is greatly contraindicated.' Yu Zhu's cooling, moistening nature is inappropriate when the body is already cold and deficient.

Caution

Wind-Cold exterior patterns without Yin Deficiency. Yu Zhu is only appropriate for exterior conditions when there is an underlying Yin Deficiency component. Using it for simple Wind-Cold invasion may trap the pathogen by adding moisture without releasing the exterior.

Classical Incompatibilities

Yu Zhu does not appear on the Eighteen Incompatibilities (十八反) or Nineteen Mutual Fears (十九畏) lists. The Ben Cao Bei Yao notes that Yu Zhu 'fears salty brine' (畏咸卤), which is a traditional processing-related caution rather than a formal incompatibility.

Special Populations

Pregnancy

Generally considered safe at standard dosages during pregnancy. Yu Zhu is a gentle, non-toxic Yin-nourishing herb with no known uterine-stimulating or teratogenic properties. It has historically been used without specific pregnancy warnings in classical texts. However, its slightly cold and moistening nature means it should be used cautiously in pregnant women with Spleen-Yang Deficiency or loose stools, as it may worsen digestive symptoms.

Breastfeeding

No specific contraindications during breastfeeding have been recorded in classical or modern sources. Yu Zhu is classified as a food-medicine dual-use herb (药食两用) by China's health authorities and is widely consumed in dietary soups and teas. Its gentle, non-toxic nature suggests a low risk profile during lactation. Standard dosages are unlikely to cause adverse effects in nursing infants. Women with weak digestion or loose stools should still exercise caution due to its moistening, slightly cold nature.

Pediatric Use

Yu Zhu is generally safe for children. As a gentle, non-toxic herb classified for food-medicine dual use, it is commonly included in paediatric dietary soups in southern China. Dosage should be reduced proportionally based on age and body weight, typically one-third to one-half of the adult dose for young children. It is best avoided in infants and toddlers with immature digestive systems or those with loose stools, as its moistening nature may impair digestion.

Drug Interactions

Yu Zhu's known pharmacological activities suggest several theoretical drug interactions, though none are extensively documented in clinical studies:

  • Hypoglycaemic medications: Yu Zhu contains compounds (including homoisoflavanones and polysaccharides) that have demonstrated blood glucose-lowering effects in animal studies. Concurrent use with insulin, metformin, or sulfonylureas may theoretically increase the risk of hypoglycaemia. Blood sugar levels should be monitored.
  • Cardiac glycosides (e.g. digoxin): Yu Zhu rhizome contains convallamarin and convallarin, cardiotonic glycosides related to those found in lily of the valley. Concurrent use with digoxin or other cardiac glycosides could theoretically potentiate cardiac effects and should be approached with caution.
  • Anticoagulant/antiplatelet drugs: Some Polygonatum steroidal glycosides have shown tissue factor-inhibiting activity. While clinical significance is unclear, concurrent use with warfarin or similar drugs warrants monitoring.

Dietary Advice

Avoid excessive consumption of cold, raw, greasy, or heavy foods while using Yu Zhu, as these can generate Dampness and counteract the herb's Yin-nourishing benefits. Light, easily digestible foods that support Stomach Yin (such as congee, pears, lily bulb, and tremella mushroom) are complementary. The Ben Cao Bei Yao cautions against combining Yu Zhu with salty or briny substances (畏咸卤).

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.