Herb

Chi Xiao Dou

Adzuki bean | 赤小豆

Also known as:

Rice Bean

Chi Xiao Dou

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Properties

Dampness-draining herbs (利水渗湿药) · Neutral

Traditionally supports*

Fluid Retention and Edema Skin Health Urinary Health Digestive 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

Adzuki bean is a gentle, food-grade herb widely used in Chinese medicine to reduce swelling and help the body shed excess water. It is especially helpful for puffy legs and ankles, mild jaundice, and skin infections like boils or abscesses. As both a medicine and a common food, it is mild enough for everyday use in soups and porridges.

Herb Category

Dampness-draining herbs (利水渗湿药) Water-draining and edema-reducing herbs (利水消肿药)

Main Actions

  • Promotes Urination and Reduces Edema
  • Clears Damp-Heat and Resolves Jaundice
  • Resolves Toxicity and Expels Pus
  • Invigorates Blood and Dispels Stasis

How These Actions Work

'Promotes urination and reduces edema' means Chi Xiao Dou helps the body get rid of excess fluid through urination. It has a natural downward-moving tendency that opens the water pathways and drains accumulated Dampness out of the body. This is why it is especially suited for swelling in the lower body, such as puffy legs, ankles, or feet, as well as more severe whole-body water retention. It can be used alone as a food remedy or combined with other water-draining herbs like Fu Ling (Poria) or Ze Xie (Alisma).

'Clears Dampness and relieves jaundice' refers to its ability to help resolve mild cases of Damp-Heat jaundice, where the skin and eyes turn yellow due to trapped moisture and heat obstructing normal bile flow. By draining Dampness downward through urination, Chi Xiao Dou helps clear the underlying cause of the yellowing. For jaundice, it is typically combined with herbs like Ma Huang (Ephedra) and Lian Qiao (Forsythia) in formulas such as Ma Huang Lian Qiao Chi Xiao Dou Tang.

'Resolves toxicity and expels pus' means it helps the body deal with hot, swollen, infected skin conditions like boils, abscesses, and carbuncles. It can be taken internally as a decoction or ground into powder and applied as a paste directly onto swollen, infected areas. This action relates to its ability to enter the Blood level and clear Heat toxins.

'Disperses Blood stasis' refers to a secondary action where Chi Xiao Dou gently moves stagnant Blood. This contributes to its effectiveness for conditions where blood and fluid stasis combine, such as intestinal abscesses with abdominal pain and bloody stool.

Patterns Addressed

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

Chi Xiao Dou enters the Heart and Small Intestine channels and has a strong downward-draining tendency. Its sweet and sour taste combined with its neutral temperature makes it effective at draining Dampness without being excessively cold. In Damp-Heat of the Lower Burner, fluids become trapped and stagnant, often complicated by Heat. Chi Xiao Dou promotes urination to drain this Damp-Heat downward and out of the body, addressing the root accumulation of pathogenic moisture in the lower body. This is why it works so well for conditions like urinary difficulty, lower limb edema, and stranguria associated with this pattern.

A practitioner would look for one or more of these signs

Edema

Especially lower limb edema

Urinary Difficulty

Scanty, dark urine

Jaundice

Mild Damp-Heat jaundice with yellow skin

TCM Properties

Temperature

Neutral

Taste

Sweet (甘 gān), Sour (酸 suān)

Channels Entered
Heart Small Intestine
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 Chi Xiao Dou (Vigna umbellata) seeds are oblong and slightly flattened, 5-8 mm long and 3-5 mm wide, with a dark purplish-red or brownish-red seed coat. The surface should have little or no luster. A key feature is the linear white hilum (seed scar) running along one side for about two-thirds of the seed length, with a sunken longitudinal groove in the center. The seeds should be plump, firm, and hard to break. When split open, the two cotyledons are milky white. The herb should have a very faint smell and a slightly sweet, bean-like taste. As Li Shizhen emphasized, the best medicinal quality is the small, compact, dark-colored variety. Larger, brightly colored pale-red beans (the common culinary red bean, Vigna angularis) are considered inferior for medicinal purposes.

Primary Growing Regions

Chi Xiao Dou (Vigna umbellata) is primarily distributed across southern China, including Guangdong, Guangxi, Jiangxi, Zhejiang, Hunan, Guizhou, and Yunnan provinces, where it grows both wild and cultivated. The related species used as food (Vigna angularis, adzuki bean) is more widely cultivated across China's northeast (Heilongjiang, Jilin, Liaoning), northern plains (Hebei, Henan), and Jiangsu-Anhui region. For medicinal purposes, the narrow, dark-colored Vigna umbellata from southern provinces (especially Guangdong, Guangxi, and Jiangxi) is traditionally considered superior. There is no single famous dao di production region, as the herb is widely grown, but southern Chinese material is traditionally preferred for medicinal use.

Harvesting Season

Autumn, when the pods are mature but have not yet split open. The whole plant is pulled up, sun-dried, and the seeds are threshed out.

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

9-30g

Maximum

Up to 60g in acute edema or when used as a food-therapy decoction with carp, under practitioner guidance. As a non-toxic food-grade herb, the upper limit is generous, but excessive long-term use depletes body fluids.

Notes

For general water-dampness conditions and mild edema, use the standard range of 9-15g in decoction. For more pronounced edema, jaundice, or as part of food therapy (e.g., cooked with carp or crucian carp), dosages of 15-30g or higher are common. For external application as a poultice on abscesses and sores, grind an appropriate amount into powder and mix with egg white or water to form a paste. When used alone as a therapeutic food (e.g., boiled to a porridge), larger amounts up to 30-60g may be used. Long-term use at high doses should be avoided to prevent over-draining of body fluids, which can cause dryness and weight loss.

Processing Methods

Processing method

Dry-fried in a wok over medium heat until the exterior darkens slightly and a fragrant aroma emerges, then removed and cooled.

How it changes properties

Stir-frying slightly warms the herb's nature and reduces its draining potency, making it gentler on the Spleen and Stomach. The processed form is less aggressive at draining fluids and slightly better at supporting digestion.

When to use this form

When Chi Xiao Dou is needed for Dampness but the patient has underlying Spleen deficiency or a weak digestive system that cannot tolerate strong draining. The raw form is preferred for acute edema or Damp-Heat conditions where strong drainage is needed.

Toxicity Classification

Non-toxic

Chi Xiao Dou is classified as non-toxic in the Chinese Pharmacopoeia and has an extensive history of safe use both as food and medicine. The main safety concern is not toxicity but rather the risk of over-draining fluids with prolonged or excessive use. Classical physicians warned that extended consumption depletes body fluids, leading to dryness, weight loss, and a sensation of bodily heaviness. This is a consequence of its strong diuretic and fluid-draining properties, not any inherent toxic component.

Contraindications

Caution

People with Yin deficiency and body fluid depletion without dampness should avoid this herb. Chi Xiao Dou has a strongly draining, downward-directing nature that can further deplete fluids in someone already dry and deficient.

Caution

Spleen and Stomach deficiency-cold without dampness. The herb's cool, draining nature can further weaken a cold, weak digestive system if there is no concurrent dampness to resolve.

Caution

Prolonged use in thin or emaciated individuals. Classical sources warn that long-term consumption causes the body to become thin and dried out. Tao Hongjing noted it 'drives out fluids' and the Shi Xing Ben Cao warns that prolonged use 'makes people thin.'

Caution

Frequent urination or polyuria without edema. Since Chi Xiao Dou promotes urination, it would worsen conditions where excessive urination is already a problem.

Caution

Snakebite patients within 100 days, according to the Sui Xi Ju Yin Shi Pu (随息居饮食谱).

Special Populations

Pregnancy

Generally considered safe during pregnancy at standard dietary and medicinal doses. Chi Xiao Dou is a food-grade herb without known uterine-stimulating properties. Classical texts do not list it among pregnancy-contraindicated herbs, and the Ben Cao Gang Mu even notes its use for difficult labor and expulsion of the placenta. However, because of its fluid-draining nature, excessive or prolonged use should be avoided during pregnancy to prevent unnecessary depletion of body fluids.

Breastfeeding

Considered safe and potentially beneficial during breastfeeding. Classical texts specifically note that Chi Xiao Dou promotes lactation (tong ru zhi, 通乳汁). The Ben Cao Gang Mu records its use for insufficient breast milk, and historical case literature describes cooking red beans and drinking the decoction to promote milk flow. No concerns about harmful transfer through breast milk have been documented.

Pediatric Use

Chi Xiao Dou is a food-grade herb considered safe for children. It is commonly included in pediatric diets in the form of porridge or soup. Classical literature records its use as a wash for childhood jaundice and skin sores. Dosage for children should be reduced proportionally by age and body weight: roughly one-third of the adult dose for young children (ages 3-6) and one-half to two-thirds for older children (ages 7-12). No specific age restrictions apply.

Drug Interactions

No well-documented serious drug interactions have been reported for Chi Xiao Dou in clinical literature. As a diuretic herb, it may theoretically have additive effects when combined with pharmaceutical diuretics (such as furosemide or hydrochlorothiazide), potentially enhancing fluid loss and electrolyte imbalance. Patients on diuretic medications should inform their healthcare provider before using Chi Xiao Dou in medicinal doses.

The herb's demonstrated alpha-glucosidase inhibitory activity in laboratory studies suggests a theoretical interaction with antidiabetic medications (such as acarbose or metformin), potentially enhancing blood-sugar-lowering effects. People taking diabetes medications should monitor blood glucose levels if using Chi Xiao Dou regularly in medicinal quantities.

Dietary Advice

When taking Chi Xiao Dou for its dampness-draining effects, it is best to avoid greasy, rich, or overly sweet foods that can generate more dampness and counteract the herb's action. Cold, raw foods should also be minimized if the person has underlying Spleen deficiency. The herb pairs well with bland, supportive foods like rice, millet porridge, and cooked vegetables. Classical food therapy combinations include Chi Xiao Dou cooked with carp (li yu) for edema, or with coix seed (yi yi ren) for general dampness.

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.