Herb

Fu Xiao Mai

Light wheat | 浮小麦

Also known as:

Light Wheat

Fu Xiao Mai

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Properties

Astringent / Stabilizing herbs (收涩药) · Cool

Traditionally supports*

Excessive Sweating Menopausal support Sleep Support Post-Illness Recovery

Parts Used

Fruit (果 guǒ / 果实 guǒ shí)

*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

Fu Xiao Mai is the light, shriveled grain of wheat that floats in water, used in Chinese medicine primarily to stop excessive sweating caused by underlying weakness. It gently nourishes the Heart and clears low-grade Heat from deficiency, making it especially helpful for night sweats, spontaneous sweating, and the kind of lingering warmth that comes with prolonged fatigue or recovery from illness.

Herb Category

Astringent / Stabilizing herbs (收涩药) Herbs that stabilize the Exterior and stop sweating (固表止汗药)

Main Actions

  • Consolidates the Exterior and Stops Sweating
  • Tonifies Qi
  • Clears Deficiency Heat

How These Actions Work

'Consolidates the exterior and stops sweating' means Fu Xiao Mai helps tighten the body's surface layer so that fluids (sweat) are not leaking out uncontrollably. In TCM, sweating that happens without physical exertion (spontaneous sweating) or during sleep (night sweats) signals that the body's defensive barrier is weak. Fu Xiao Mai enters the Heart channel, and since sweat is considered 'the fluid of the Heart,' it works by nourishing the Heart and anchoring its fluids. This is why it is used for both types of abnormal sweating, whether from Qi deficiency or Yin deficiency.

'Tonifies Qi' refers to Fu Xiao Mai's gentle ability to support the body's vital Qi, particularly Heart Qi and the defensive Qi (Wei Qi) at the body surface. It is a mild tonic rather than a powerful one, which makes it safe for long-term use and suitable even for children or those recovering from illness.

'Clears deficiency Heat' means it helps relieve the low-grade, lingering warmth that arises when the body's cooling Yin fluids are depleted. This is not the high fever of an acute infection, but rather the afternoon flushing, night sweats, and sensation of heat in the palms and soles that accompanies chronic exhaustion or what classical texts call 'bone-steaming Heat' (骨蒸劳热). Its cool nature gently clears this Heat without further damaging the body's resources.

Patterns Addressed

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

When the body's Qi is deficient, particularly Heart Qi and Lung Qi, the defensive barrier at the surface becomes weak and cannot hold fluids in properly. This leads to spontaneous sweating that worsens with exertion. Fu Xiao Mai is sweet and enters the Heart channel, directly nourishing Heart Qi and stabilizing the Heart's fluids. Its gentle Qi-tonifying nature supports the Wei Qi (defensive Qi) at the body surface, helping to close the pores and stop the leaking of sweat. Its cool temperature prevents it from adding unwanted Heat in an already weakened state.

A practitioner would look for one or more of these signs

Spontaneous Sweat

Sweating without exertion, worsening with activity

Eye Fatigue

Tiredness and shortness of breath

Palpitations

Heart palpitations from Qi deficiency

TCM Properties

Temperature

Cool

Taste

Sweet (甘 gān)

Channels Entered
Heart
Parts Used

Fruit (果 guǒ / 果实 guǒ shí)

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 Fu Xiao Mai grains should be uniformly sized, lightweight, and float readily when placed in water. The surface should be yellowish-white to pale brown in color, slightly wrinkled, with a clearly visible deep longitudinal groove on the belly side. The grains should be dry and brittle, with a white cross-section that has a starchy, powdery quality. They should have no discernible odor and a bland taste. Plump, heavy, fully developed wheat kernels that sink in water are NOT suitable for use as Fu Xiao Mai and should be rejected. Avoid grains that are moldy, insect-damaged, dark in color, or mixed with excessive chaff and soil.

Primary Growing Regions

Fu Xiao Mai is produced across all major wheat-growing regions of China and has no single dominant 'terroir' region. Wheat is one of the most widely cultivated crops in China, and Fu Xiao Mai is simply collected from the shriveled, lightweight grains during the normal wheat harvest. Major wheat-producing provinces include Henan, Shandong, Hebei, Anhui, Jiangsu, and Shaanxi. Winter wheat varieties are generally preferred for medicinal use.

Harvesting Season

Early to mid-summer (around the summer solstice), when the wheat crop reaches maturity. The shriveled, lightweight grains are separated during harvest by winnowing or water flotation.

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

15–30g

Maximum

Up to 60g in severe or persistent sweating conditions, under practitioner guidance. As a food-grade herb with very low toxicity risk, higher doses are generally well tolerated.

Notes

For stopping sweating (the primary use), dry-frying (炒) the grains lightly before decocting enhances the astringent effect. The standard decoction dose is 15–30g. When used as a powder (such as in Du Sheng San), the dose is typically 3–5g per serving, taken with rice water. Higher doses in the 30–60g range may be used for stubborn or severe sweating. For clearing deficiency Heat and bone-steaming disorder, it is typically combined with Yin-nourishing herbs such as Mai Dong, Sheng Di, and Di Gu Pi rather than used alone.

Processing Methods

Processing method

Stir-fried in a dry pan over gentle heat until the surface turns golden-brown (棕黄色), then removed and cooled.

How it changes properties

Stir-frying enhances Fu Xiao Mai's astringent, sweat-stopping action. The mild charring concentrates its binding quality, making it more effective at sealing the body surface and stopping perspiration. The thermal nature shifts slightly warmer, and the Qi-tonifying effect is mildly strengthened. The Heat-clearing action is somewhat reduced.

When to use this form

Use stir-fried Fu Xiao Mai when the primary goal is maximizing its sweat-stopping power, particularly for stubborn spontaneous sweating or night sweats. The raw form is preferred when deficiency Heat is prominent and its cooling, Heat-clearing action is also needed.

Toxicity Classification

Non-toxic

Contraindications

Avoid

Sweating due to exterior pathogenic invasion (external wind-cold or wind-heat patterns). Fu Xiao Mai is an astringent that stops sweating by consolidating the exterior. Using it when sweating is the body's appropriate response to expel a pathogen would trap the pathogen inside and worsen the condition.

Avoid

Profuse sweating from Qi collapse (prostration sweating, or 'abandoned yang' syndrome). This is an emergency requiring immediate rescue of Yang, not gentle astringent therapy. Fu Xiao Mai's mild astringent action is entirely inadequate here and could delay proper treatment.

Avoid

Wheat allergy or celiac disease. Although Fu Xiao Mai is shriveled and immature wheat grain, it is still Triticum aestivum and contains wheat proteins. People with known wheat allergy or gluten sensitivity should avoid it.

Caution

Diabetes patients should use with caution due to starch content that may affect blood sugar levels.

Special Populations

Pregnancy

Generally considered safe at standard doses during pregnancy. Fu Xiao Mai is a mild, food-grade herb (shriveled wheat grain) with no known uterine-stimulating or teratogenic properties. It is commonly used in dietary therapy in China, including for pregnant and postpartum women with sweating disorders. However, as with all herbs during pregnancy, use should follow practitioner guidance.

Breastfeeding

Generally considered safe during breastfeeding. Fu Xiao Mai is a food-grade medicinal substance (shriveled wheat grain) with no known harmful components that would transfer through breast milk. It has been used traditionally in postpartum dietary recipes in China. No special concerns have been reported.

Pediatric Use

Fu Xiao Mai is considered safe and gentle for pediatric use. It is commonly included in children's formulas and proprietary medicines (such as Xu Han Ting Ke Li / 虚汗停颗粒) for childhood sweating disorders. Dosage should be reduced proportionally by age and body weight. For young children, roughly one-third to one-half of the adult dose (5–15g) is typical. It can also be prepared as a simple food-style decoction with red dates for easier administration.

Drug Interactions

No significant drug interactions have been reported in clinical literature. As a food-grade herb composed primarily of starch, protein, and small amounts of vitamins and lipids, Fu Xiao Mai has very low pharmacological potency and minimal interaction potential. However, because it has mild blood-lipid-lowering effects reported in animal studies, theoretically it could have an additive effect with lipid-lowering medications, though this is not clinically established.

Dietary Advice

When taking Fu Xiao Mai for sweating disorders, avoid excessively spicy, pungent, and sweat-promoting foods such as raw ginger, chili peppers, and black pepper, as these work against the herb's astringent action. Warm, easily digestible foods that support the Spleen and Qi are preferred, such as congee, red dates, and well-cooked grains. Cold and raw foods should also be limited if there is underlying Qi deficiency.

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.