Herb

Sha Yuan Zi

Astragalus seed | 沙苑子

Also known as:

Sha Yuan Ji Li

Sha Yuan Zi

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Properties

Yang-tonifying herbs (补阳药) · Warm

Traditionally supports*

Kidney Health Reproductive Health Eye Health and Vision Urinary Health

Parts Used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

*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

Shā Yuàn Zǐ is a gentle warming herb used to support Kidney and Liver health. It is best known for helping with lower back pain, frequent urination, involuntary seminal emission, and blurry vision caused by Kidney weakness. Its mild nature makes it suitable for sustained use, and it is a core ingredient in the classical formula Jīn Suǒ Gù Jīng Wán for stabilizing Essence.

Herb Category

Yang-tonifying herbs (补阳药)

Main Actions

  • Tonifies Kidney Yang
  • Secures Essence and Stops Enuresis
  • Nourishes the Liver and Brightens the Eyes

How These Actions Work

'Tonifies the Kidneys and assists Yang' means Shā Yuàn Zǐ gently warms and strengthens Kidney function. The Kidneys in TCM govern reproduction, growth, and the lower back. When Kidney Yang is depleted, people may experience low back pain, fatigue, low libido, or impotence. Shā Yuàn Zǐ provides a mild, non-drying warmth that supports Kidney Yang without being overly heating, making it suitable for people who need gentle, sustained supplementation rather than strong stimulation.

'Secures Essence and reduces urination' refers to the herb's astringent quality. In TCM, the Kidneys store Essence (Jīng), the fundamental substance responsible for reproduction and vitality. When the Kidneys are weak, Essence can 'leak' out, manifesting as involuntary seminal emission, frequent urination, urinary incontinence, or excessive vaginal discharge. The sweet and astringent nature of Shā Yuàn Zǐ 'tightens' this leakage, helping the body hold onto its Essence. This is the herb's most distinctive strength compared to other Kidney-tonifying herbs.

'Nourishes the Liver and brightens the eyes' reflects the TCM principle that the Liver opens into the eyes, meaning that when the Liver and Kidneys are well-nourished, vision is clear. For people with blurry vision, diminished visual acuity, or dizziness due to Liver and Kidney deficiency rather than acute eye disease, Shā Yuàn Zǐ supports the underlying organ systems that maintain healthy eyesight. It is often combined with Gǒu Qǐ Zǐ (goji berry) and Tù Sī Zǐ (dodder seed) for this purpose.

Patterns Addressed

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

Shā Yuàn Zǐ is sweet and warm, entering the Kidney channel, which makes it directly suited to warming Kidney Yang. When Kidney Yang is depleted, the lower back loses its support, reproductive function declines, and the body's ability to hold onto fluids weakens. Shā Yuàn Zǐ provides gentle Kidney Yang tonification combined with an astringent quality that secures Essence and reduces fluid leakage. Unlike stronger Yang-tonifying herbs such as Bǔ Gǔ Zhī or Xiān Líng Pí, Shā Yuàn Zǐ warms without being drying or overly stimulating, making it appropriate for mild to moderate Kidney Yang Deficiency.

A practitioner would look for one or more of these signs

Lower Back Pain

Dull, chronic lower back pain that worsens with fatigue

Premature Ejaculation
Frequent Urination

Especially nocturnal urination from Kidney weakness

Eye Fatigue

Accompanied by cold limbs and weak knees

TCM Properties

Temperature

Warm

Taste

Sweet (甘 gān), Astringent (涩 sè)

Channels Entered
Liver Kidneys
Parts Used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

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 Sha Yuan Zi seeds are kidney-shaped and slightly flattened, about 2–2.5 mm long, 1.5–2 mm wide, and approximately 1 mm thick. The surface should be smooth and greenish-brown or greyish-brown in colour. One edge should have a slight indentation with a visible round hilum (seed scar). The seeds should be hard and difficult to crush. When split open, two pale yellow cotyledons are visible with a curved radicle about 1 mm long. Good seeds are plump and full, not shrivelled. There should be no odour; when chewed, they have a mild bean-like flavour. Avoid seeds that are dark or blackened, excessively lightweight, or mixed with obvious foreign seeds. Note that freshly harvested seeds may not meet pharmacopoeia standards for complanatoside content until they have been aged (chen hua) for 1.5 to 3 years.

Primary Growing Regions

The recognized dao di (terroir) region for Sha Yuan Zi is Dali County (大荔县) in Weinan, Shaanxi Province, which produces over 80% of China's commercial supply. The herb's name literally refers to the Sha Yuan (沙苑, Sandy Pasture) area of Tongzhou (modern-day Dali), where it was historically harvested wild. In the Ming-Qing period, the Tongguan (潼关) area of Shaanxi was also famous, giving rise to the alias Tong Ji Li (潼蒺藜). Other producing regions include Inner Mongolia, Hebei, Shanxi, Gansu, Liaoning, Jilin, Ningxia, Henan, and Sichuan, though quality from these areas is generally considered secondary to the Shaanxi product.

Harvesting Season

Late autumn to early winter (approximately November), when the seed pods are mature but have not yet split open.

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

9–15g

Maximum

Up to 20g in decoction for adults, as referenced in some Materia Medica sources. No specific toxicity threshold has been established.

Notes

Use the lower range (9–10g) for mild Kidney deficiency with eye symptoms or as a supporting herb. Use the higher range (15–20g) for more pronounced Kidney deficiency with seminal emission, frequent urination, or excessive vaginal discharge. For brightening the eyes and nourishing the Liver, use the herb raw (sheng yong). For securing essence, reducing urination, and stopping discharge, the salt-processed form (yan sha yuan zi) is preferred, as salt directs the herb's action downward into the Kidney channel.

Processing Methods

Processing method

The clean seeds are sprayed with salt water, mixed evenly, then stir-fried in a pan over gentle heat until dry. The standard ratio is 2 jin of salt dissolved in boiling water per 100 jin of herb.

How it changes properties

Salt processing directs the herb's action more strongly into the Kidney channel, enhancing its Kidney-tonifying and Essence-securing effects. The thermal nature remains warm. The taste gains a slight saltiness, which in TCM theory guides medicinal action downward to the Kidneys. The astringent, Essence-fixing quality becomes more pronounced.

When to use this form

Use the salt-processed form when the primary treatment goal is securing Essence and reducing urination, such as for involuntary seminal emission, premature ejaculation, frequent urination, or vaginal discharge from Kidney deficiency. This is the preferred form for the formula Jīn Suǒ Gù Jīng Wán.

Toxicity Classification

Non-toxic

Sha Yuan Zi is classified as non-toxic in the Ben Cao Gang Mu, which states it is "甘，温，无毒" (sweet, warm, non-toxic). It has no known toxic components at standard dosages. However, pharmacological research has identified uterine-contracting activity and platelet aggregation-inhibiting effects, which warrant caution in pregnancy and bleeding disorders rather than indicating toxicity per se. Some Astragalus species are known to accumulate selenium in selenium-rich soils, but this is not a documented concern with cultivated A. complanatus at standard medicinal doses.

Contraindications

Caution

Yin deficiency with vigorous Fire (阴虚火旺): Sha Yuan Zi is warm and tonifying in nature, which can aggravate Heat signs in those with underlying Yin deficiency. Symptoms such as night sweats, hot flashes, and a red tongue with little coating indicate this pattern.

Caution

Hyperactive ministerial Fire with easy erection (相火炽盛，阳强易举): Classical texts specifically warn against using this herb when sexual arousal is excessive due to pathological Fire rather than true deficiency.

Caution

Heat in the Kidney and Bladder (肾与膀胱偏于热者): As noted in the Ben Jing Feng Yuan, this warm herb should not be used when the urogenital system shows signs of Heat, such as burning urination, dark scanty urine, or urinary tract infections.

Caution

Difficult urination or urinary retention (小便不利): Because Sha Yuan Zi has an astringent, urine-reducing quality, it should be avoided when urination is already blocked or insufficient.

Caution

Active bleeding disorders: Pharmacological research has shown that Sha Yuan Zi can inhibit platelet aggregation. People with bleeding conditions or a tendency to bleed should use it cautiously.

Caution

Hypotension: Sha Yuan Zi has demonstrated blood-pressure-lowering effects in animal studies. People with already low blood pressure should avoid large or prolonged doses.

Special Populations

Pregnancy

Use with caution during pregnancy. Pharmacological studies have demonstrated that Sha Yuan Zi has uterine-contracting (oxytocic) activity, which could theoretically stimulate premature contractions. While it is not classified as absolutely contraindicated in pregnancy in classical texts, the demonstrated uterine-stimulating effect means it should be avoided or used only under close practitioner supervision during pregnancy, particularly in the first trimester or in women with a history of miscarriage.

Breastfeeding

No specific classical or modern contraindications for breastfeeding have been established. However, given the herb's warm, tonifying nature and its demonstrated pharmacological activities (including blood pressure lowering and platelet aggregation inhibition), it is prudent to use only at standard doses and under practitioner guidance during breastfeeding. There is no specific data on whether active constituents transfer into breast milk.

Pediatric Use

Sha Yuan Zi is a gentle, non-toxic Kidney-tonifying herb that is not commonly used in pediatric practice, as Kidney deficiency patterns requiring essence-securing treatment are predominantly adult conditions. If used in children (for example, for bedwetting due to Kidney deficiency), dosage should be proportionally reduced based on age and body weight, typically to one-third to one-half of the adult dose. It should only be prescribed by a qualified practitioner who has confirmed the appropriate pattern diagnosis in the child.

Drug Interactions

Antihypertensive medications: Sha Yuan Zi has demonstrated blood-pressure-lowering effects in animal studies, acting in part through the renin-angiotensin system. It could theoretically potentiate the effects of ACE inhibitors, angiotensin receptor blockers (ARBs), or other antihypertensive drugs, increasing the risk of hypotension.

Anticoagulant and antiplatelet drugs: Research has shown that Sha Yuan Zi can inhibit platelet aggregation. Concurrent use with blood-thinning medications such as warfarin, heparin, aspirin, or clopidogrel could increase bleeding risk. Patients on these medications should consult their healthcare provider before using this herb.

Oxytocic medications: Given the demonstrated uterine-contracting activity, concurrent use with drugs that stimulate uterine contractions (such as oxytocin or misoprostol) should be avoided.

Dietary Advice

When taking Sha Yuan Zi for Kidney deficiency, favour warm, cooked foods that support the Kidney and Spleen, such as black beans, walnuts, lamb, and warm grains. Avoid excessive cold, raw foods and iced beverages, which can impair the warming, consolidating action of the herb. Since Sha Yuan Zi is warm in nature, those who tend toward Yin deficiency Heat should moderate intake of spicy, heating foods (chilli, alcohol, fried foods) to avoid aggravating internal warmth.

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.