Fruits and seedsDigestantFructus Hordei Germinatus

Mai Ya (Barley Sprout)

Q: What is Mai Ya? Are Sheng Mai Ya, Chao Mai Ya, Jiao Mai Ya and Gu Ya the same?

Official Mai Ya (麦芽) is the germinated then dried ripe fruit of Hordeum vulgare . The pharmacopoeial name is Hordei Fructus Germinatus . Raw Mai Ya fortifies the Spleen, harmonizes the Stomach and courses Liver Qi—Spleen deficiency with poor appetite and milk accumulation favor it. Dry-fried Mai Ya moves Qi, reduces food and returns milk—food stagnation and weaning favor it. Scorched Mai Ya reduces food and transforms stagnation—epigastric-abdominal distending pain favors it. Gu Ya is germinated rice: gentler to reduce food, a little stronger to fortify the Spleen. Do not swap in ungerminated barley or brewing malt. Write raw, fried or scorched.

Q: What are the TCM properties and traditional uses of Mai Ya?

According to the Chinese Pharmacopoeia, Mai Ya is sweet and neutral , enters the Spleen and Stomach channels, and acts to move Qi and reduce food, fortify the Spleen and open the appetite, and return milk to reduce distention . It is used for untransformed food accumulation, epigastric-abdominal distending pain, Spleen deficiency with little food intake, accumulated milk, breast distending pain, weaning, Liver-constraint rib-side pain, and Liver-Stomach Qi pain. Sweet-neutral reducing—especially for rice, flour, potato and taro stagnation, not for those without accumulation, those already too weak in Spleen and Stomach, or nursing mothers who wish to continue milk (large fried doses).

Q: What is the usual dosage? Can it be drunk daily as a digestive tea?

The pharmacopoeial decoction is 10–15 g ; fried, 60 g to return milk . Food stagnation may join hawthorn and medicated leaven for a short course, not a four-season “Stomach tea.” Long use without accumulation can consume Qi. Nursing mothers who wish to keep milk must not take large fried doses.

Q: How do you choose and store Mai Ya?

Choose large plump grains with intact sprouts, a yellow color and a slightly sweet taste . Mold, moth, broken sprouts, overgrown sprouts or ungerminated grain are inferior. Fried lots are brown-yellow and aromatic; scorched lots are burnt-brown. Store ventilated and dry, protected from moth. Buy pharmacopoeial Mai Ya in the named processed form; do not replace it with ungerminated barley or anonymous barley flakes.

A practical guide to Mai Ya: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

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Last reviewed Oct 13, 2026

Quick Facts

Latin Name	Fructus Hordei Germinatus
Chinese Name & Pinyin	麥芽 · Mai Ya
Medicinal Part	Fruits and seeds
The herb	Mai Ya is sprouted, dried barley. Common forms: raw, dry-fried, and scorched. Gu Ya and Shen Qu are different food-dispersing herbs.
Nature and channels	Sweet, neutral. Enters the Spleen and Stomach. Sweetness harmonizes the middle. The sprouted qi disperses food and courses the Liver.
Pharmacopoeia line	Moves qi and disperses food. Strengthens the spleen and opens the appetite. Reduces lactation and swelling. Used for food accumulation, epigastric and abdominal distention and pain, spleen deficiency with poor appetite, accumulated milk, breast distention and pain, and weaning.
Pattern cues	Abdominal distention and pain. Sour belching and poor appetite. Distended painful breasts. Accumulated milk.
In this article	Raw versus fried versus scorched Mai Ya. How it differs from Gu Ya, Shen Qu, and Shan Zha. Why weaning is not a home protocol. Who should skip it.

What Is Mai Ya?

Mai Ya (麦芽; Mài Yá; Latin: Hordei Fructus Germinatus; English: germinated barley / malted barley) is the ripe fruit of Hordeum vulgare L. that has been sprouted and dried. In Chinese medicine it is a food-dispersing herb. It is sweet and neutral, enters the Spleen and Stomach channels, and its core actions are to move qi and disperse food, strengthen the spleen and open the appetite, and reduce lactation and swelling. It is not brewing malt extract. Beer malt and the official piece do not share the same processing, dose, or indications. It is not Gu Ya (rice sprout) or Shen Qu (medicated leaven). Gu Ya disperses grain food more gently. Shen Qu also releases the exterior and transforms dampness. Mai Ya is especially used for wheat- and flour-type accumulation. It also enters Liver qi and can course the Liver and ease distention.

It is used most often for three patterns:

Food accumulation that will not move — abdominal distention and pain, sour belching, no desire to eat
Spleen deficiency with poor appetite — weak transport, fullness after meals
Milk accumulation / reducing lactation — breast distention and pain; weaning must be decided by a practitioner, including the processed form and the dose

Raw Mai Ya courses the Liver and disperses food more gently. Dry-fried Mai Ya leans toward dispersing food and harmonizing the middle. Scorched Mai Ya is stronger at dispersing accumulation. Traditionally, a larger dose of the scorched form is used to reduce lactation. The usual food-dispersing dose is 9–15 g. The weaning dose and processing are different. Do not raise scorched Mai Ya on your own while breastfeeding. If the aim is to keep milk flowing, scorched Mai Ya is the wrong direction. A weak middle with no accumulation should not be over-dispersed.

After too much flour food, or when constraint fills the epigastrium, Mai Ya’s sweet neutrality disperses and moves. That is why it is often paired with Shan Zha and Shen Qu. It disperses more than it tonifies. A weak middle with no accumulation becomes weaker if more dispersing is added.

Mai Ya is not a catch-all digestive, and it is not a do-it-yourself weaning formula. Dispersing when there is no accumulation, or choosing the wrong processed form while nursing, can injure the spleen and stomach or affect milk. Raw or scorched should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Mai Ya: Materia Medica Profile

Identification & Quality Standard

Fructus Hordei Germinatus

Botanical Origin

The dried sprouted fruit of Hordeum vulgare L.(Poaceae)

Production Regions

Primarily produced all over China.

Quality Requirements

Superior medicinal material is pale yellow, intact germ.

Macroscopic Features

Fusiform shape, 8~12mm long, 3~4mm diameter. Externally pale yellow, back side is the outer surrounding husk, with 5 veins, apex has a long broken awn; front side is the inner surrounding husk; when the husk is removed, the front side has one longitudinal groove; base of the radicle grows the tender sprout and rootlets. The tender sprout has a long lanceolate shape, about 0.5cm long, and the rootlets are numerous, fibrous, thin and curved. Fractured surface is white, powdery. faint odor, slightly sweet taste.

Origin and Quality Identification

Traditionally, the best barley for this herb comes from North and East China, though quality heavily depends on the harvest timing and processing methods.

Identifying Premium Quality: Good Mai Ya (Barley Sprout) is spindle-shaped, about 8 to 12 millimeters long, and pale yellow. It should have its outer husk intact, a visible groove on the belly, and tiny rootlets. It is hard, and the inside is white and powdery.
Processed Looks: Raw sprouts are simply dried. Stir-fried sprouts are slightly yellow with occasional scorch marks, while charred sprouts are dark brown and carry a distinct roasted aroma.
Common Imposters: It is sometimes confused with Xiao Mai Ya (Wheat Sprout). However, wheat sprouts are generally thinner and have much thinner husks.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Sweet; NeutralSpleenStomach

1. Historical Records

Ming Yi Bie Lu (Miscellaneous Records of Famous Physicians): Noted that it helps digest food, clear cold trapped in the digestive tract, and relieve bloating in the abdomen.
Ben Cao Gang Mu (Compendium of Materia Medica): Expanded its uses, stating it is highly effective at digesting stagnant starchy foods (like rice and noodles) and fruits.
De Pei Ben Cao (Materia Medica of Combinations): Highlighted a unique use, mentioning its ability to reduce breast engorgement and stop lactation, showing its power to clear blockages.

2. Evolution of TCM Understanding

Over centuries, TCM doctors have viewed Mai Ya (Barley Sprout) through slightly different lenses. Some relied on it purely as a digestive aid for overeating. Others appreciated its gentle Spleen-strengthening properties, using it for people with weak digestion who easily get bloated. Still, others focused on its ability to soothe Liver energy and relieve postpartum breast engorgement. These variations highlight its versatility, though it is always used tailored to specific conditions.

Core Efficacies & Traditional Applications

Traditional Functions

Moves qi, digest food, promotes spleen, opens appetite, returns milk, eliminates swelling. Apply to food accumulation and indigestion, abdominal swelling and pain, deficiency of spleen and little food intake, stagnation of milk and sweat, distention and pain of the breast, ablactation. Unprocessed mai ya can promote spleen and harmonizes stomach and frees mammary. Apply to deficiency of spleen and little food intake, stagnation of mammary and sweat.

1. Primary Focus: Relieving Food Stagnation

Mai Ya (Barley Sprout) is traditionally used to help the Spleen and Stomach process stagnant food. It effectively relieves bloating, acid reflux, and poor appetite caused by overeating, especially after consuming too many starchy foods, grains, or heavy meats.

Common Pairings: It is often combined with Shan Zha (Hawthorn Fruit) or Shen Qu (Medicated Leaven) to enhance the digestion of meat and starches. It is also paired with Chen Pi (Tangerine Peel) to regulate Qi and relieve gas.
Caution: If your poor appetite is due to a weak Spleen rather than actual food accumulation, avoid using it on its own, as over-stimulating digestion can further weaken the Spleen.

2. Secondary Focus: Stopping Lactation and Relieving Breast Engorgement

This herb is uniquely capable of clearing blockages in the milk ducts, helping to reduce milk production and alleviate the pain of swollen breasts.

Common Uses: It is widely used for women who are weaning their babies or dealing with painful milk stasis.
Common Pairings: For this purpose, it is often paired with Shen Qu (Medicated Leaven) or Qing Pi (Green Tangerine Peel) to disperse nodules and regulate energy.
Caution: Do not use this if you are currently breastfeeding and wish to maintain your milk supply.

3. Common Herb Pairings

A classic combination is Mai Ya (Barley Sprout) and Shan Zha (Hawthorn Fruit).

Mai Ya specializes in breaking down starches like rice and noodles.
Shan Zha excels at breaking down greasy foods and meats. Together, they provide a comprehensive solution for mixed-meal indigestion. Always consult a practitioner to confirm actual food stagnation before using.

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. Key Chemical Components

Modern analysis shows that Mai Ya (Barley Sprout) is rich in digestive enzymes, including amylase, protease, and lipase. It also contains B vitamins, amino acids, dietary fiber, and trace amounts of flavonoids and polysaccharides.

Lab Observations: In test tubes, the amylase in the sprouts successfully breaks down complex starches into smaller sugars (like maltose).
Animal Studies: Mice given the extract showed improved gastrointestinal motility and increased digestive enzyme activity.
Note: Human clinical data is still limited, though small studies suggest drinking barley sprout water can mildly relieve bloating after a heavy, starchy meal.

2. Pharmacological Directions

Current research focuses mainly on the herb's digestive enzyme activity and its physical effect on gut movement. Interestingly, modern studies confirm that temperature matters: roasting or stir-frying the sprouts significantly reduces their natural enzyme activity. While it shows promise in improving digestion in lab settings, more human trials are needed to confirm exact dosages and effects.

3. Limitations of Modern Research

Lab vs. Real Life: Results in a petri dish or a mouse do not perfectly mimic the complex human digestive system.
Extracts vs. Whole Herbs: Modern labs often use highly concentrated extracts or isolated enzymes. This is very different from traditional herbal teas, which rely on the whole plant.
Holistic Synergy: TCM believes that all the components in Mai Ya (Barley Sprout)—the enzymes, vitamins, and fibers—work together. Isolating just one chemical cannot fully explain the herb's traditional healing power.

Comparing Similar Herbs

1. Shared Traits with Similar Herbs

Mai Ya (Barley Sprout) is frequently compared to Shen Qu (Medicated Leaven).

Both relieve food stagnation, bloating, and poor appetite.
Both treat Spleen and Stomach discomfort caused by overeating.
Both require dosage control for people with weak digestion to prevent over-exhausting the Spleen.

2. Core Differences

Properties: Mai Ya is neutral and mild. Shen Qu is warm, making it better for those with a "cold" stomach.
Focus of Action: Mai Ya excels at digesting starches and gently strengthening the Spleen. Shen Qu is better for greasy meats and can help fight off mild external cold (like catching a chill while overeating).
Energy Direction: Mai Ya helps lift Spleen Qi upward to restore clear digestion, while Shen Qu focuses purely on harmonizing the middle without a strong upward or downward push.

3. A One-Sentence Summary

Mai Ya (Barley Sprout) is best for starchy food stagnation and stopping lactation, while Shen Qu (Medicated Leaven) is better suited for greasy food accumulation and mild cold symptoms.

Classical Formulas Containing Mai Ya

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鎮肝熄風湯Assistant

Formula CategoryLiver-Wind Extinguishing FormulasPrimary PatternLiver FirePrimary FunctionSedate Liver Yang, extinguish internal wind, nourish YinRelated ConditionsDizziness & Vertigo·Headache

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Formulas vs. Single Herbs

Synergy is Key: A formula is a balanced team. The healing power comes from how the herbs interact, so a single herb cannot simply replicate a full formula's effects.
Holistic Balance: The exact dosage and combination in a formula affect the entire body. Never try to mix or alter these formulas at home based on internet articles.

Diet & Daily Home Use

1. Home Herbal Teas

Mai Ya and Shan Zha Tea:
- Ingredients: 10g Sheng Mai Ya (Raw Barley Sprout), 5g Shan Zha (Hawthorn Fruit), 3g Chen Pi (Tangerine Peel).
- Method: Rinse the herbs, place them in a cup, and steep with boiling water for 10 minutes. You can refill the water until the taste fades.
- Best For: Mild bloating or acid reflux after eating too much meat or starchy food.
- Frequency: 1-2 times a week. Not for long-term daily use. Ensure you buy medicinal-grade herbs from a pharmacy, not standard agricultural barley.

2. Processing Differences and Brewing

Sheng Mai Ya (Raw): Simply dried after sprouting. It retains more natural digestive enzymes and is excellent for digestion.
Chao Mai Ya (Stir-fried): The heat reduces enzyme activity, making it milder and better suited for stopping lactation and relieving engorgement.
Brewing: There are no complex rules for home brewing; simply boil it with other ingredients for 15-20 minutes.

3. Dosage and Usage Cycle

Dosage: Traditional clinical doses range from 10-15g (higher for lactation purposes under a doctor's care). For home dietary use, 5-10g is sufficient.
Cycle: Do not use continuously for more than one week. Prolonged use can negatively impact normal digestive function.

Contraindications & Safety Warnings

1. Who Should Avoid It

Weak Digestion (Without Stagnation): If your Spleen is weak but you have no actual food built up, using this can make you weaker.
Breastfeeding Mothers: Unless you are actively trying to wean, avoid it to prevent a drop in milk supply.
Pregnant Women: Due to a lack of definitive safety data, self-administration is not advised.
Allergies: Strictly avoid if you are allergic to barley or related plants.

2. Drug Interactions and Dietary Notes

Blood Sugar and Blood Thinners: Mai Ya (Barley Sprout) contains polysaccharides that may slightly influence blood sugar levels. Diabetics and those on anticoagulants should monitor themselves and consult a doctor.
Absorption: It may reduce the absorption efficiency of certain medications. Always take it at least 1-2 hours apart from Western medicines.

3. Adverse Reactions and Overdose Risks

When used in standard doses, it is highly safe.

Mild Upset: Taking too much might cause minor bloating or acid reflux.
When to Seek Help: If you experience any allergic reactions, continuous vomiting, breathing difficulties, or a sudden worsening of symptoms, stop use immediately and seek medical attention.

Frequently Asked Questions About Mai Ya

What is Mai Ya? Are Sheng Mai Ya, Chao Mai Ya, Jiao Mai Ya and Gu Ya the same?

Official Mai Ya (麦芽) is the germinated then dried ripe fruit of Hordeum vulgare. The pharmacopoeial name is Hordei Fructus Germinatus. Raw Mai Ya fortifies the Spleen, harmonizes the Stomach and courses Liver Qi—Spleen deficiency with poor appetite and milk accumulation favor it. Dry-fried Mai Ya moves Qi, reduces food and returns milk—food stagnation and weaning favor it. Scorched Mai Ya reduces food and transforms stagnation—epigastric-abdominal distending pain favors it. Gu Ya is germinated rice: gentler to reduce food, a little stronger to fortify the Spleen. Do not swap in ungerminated barley or brewing malt. Write raw, fried or scorched.

What are the TCM properties and traditional uses of Mai Ya?

According to the Chinese Pharmacopoeia, Mai Ya is sweet and neutral, enters the Spleen and Stomach channels, and acts to move Qi and reduce food, fortify the Spleen and open the appetite, and return milk to reduce distention. It is used for untransformed food accumulation, epigastric-abdominal distending pain, Spleen deficiency with little food intake, accumulated milk, breast distending pain, weaning, Liver-constraint rib-side pain, and Liver-Stomach Qi pain. Sweet-neutral reducing—especially for rice, flour, potato and taro stagnation, not for those without accumulation, those already too weak in Spleen and Stomach, or nursing mothers who wish to continue milk (large fried doses).

How do you choose raw, fried and scorched Mai Ya? Is a special decoction needed?

Course the Liver and fortify the Spleen, or milk accumulation, with raw Mai Ya; reduce food and return milk with fried Mai Ya; food stagnation with distending pain with scorched Mai Ya. It goes in the pot with the rest. Returning milk needs a large fried dose—completely different from everyday digestant amounts; do not raise a food-therapy pinch on your own.

What is the usual dosage? Can it be drunk daily as a digestive tea?

The pharmacopoeial decoction is 10–15 g; fried, 60 g to return milk. Food stagnation may join hawthorn and medicated leaven for a short course, not a four-season “Stomach tea.” Long use without accumulation can consume Qi. Nursing mothers who wish to keep milk must not take large fried doses.

What are the contraindications? Can it be used in pregnancy and lactation?

Nursing mothers who wish to continue milk should avoid large doses (especially 60 g fried Mai Ya for returning milk); use caution when there is no accumulation or the Spleen and Stomach are already too weak. Pregnancy is not an absolute ban, but reducing-guiding herbs should not run long at high dose. Returning milk needs a practitioner’s confirmation that weaning is intended. Stop if appetite fails, fatigue appears, or milk drops unexpectedly.

Can Mai Ya reduce food, course the Liver and return milk?

It can help. Rice-flour food accumulation joins hawthorn, medicated leaven, tangerine peel and radish seed in Bao He Wan-type formulas. Liver-Stomach disharmony with rib-side distention and poor appetite may join Bupleurum and white peony. Weaning and breast distention use large-dose fried Mai Ya, often with raw hawthorn. It reduces food stagnation and milk distention—not a specific for every stomachache, every mammary hyperplasia or every infertility. Acute cholecystitis and mastitis need a physician.

Can Mai Ya be drunk daily as a slimming, sugar-lowering or weaning tea?

Food accumulation may be reduced for a short course; without accumulation, reducing only empties. Returning milk is a short, large fried dose—not a daily “weaning tea” or a meal-replacement slimming drink. “Malt lowers sugar and slims” does not replace endocrine and nutrition care. Reducing food or returning milk should name raw versus fried and a dose.

How do you choose among Mai Ya, Gu Ya, Shan Zha, Shen Qu and Ji Nei Jin?

Germinated barley is sweet-neutral: reduces rice, flour, potato and taro, and also courses the Liver and returns milk. Germinated rice is sweet-warm: reduces food, harmonizes the middle and fortifies the Spleen more gently. Hawthorn is sour-sweet and slightly warm: reduces meat and greasy food, moves Qi and dissipates stasis. Medicated leaven is acrid-sweet-warm: reduces food and harmonizes the Stomach, also releasing the exterior and transforming stagnation. Chicken gizzard lining is sweet-neutral: reduces food, moves the Spleen, astringes essence and is dedicated to transforming stones. Rice-flour accumulation favors Mai Ya and Gu Ya; meat accumulation favors Shan Zha; concurrent exterior pattern favors Shen Qu. They may be paired; all are wrong as long reducing without accumulation. Returning milk favors large-dose fried Mai Ya—do not substitute an equal weight of Gu Ya.

Which herbs is Mai Ya combined with? What are the representative formulas?

Food accumulation joins hawthorn, medicated leaven, Pinellia, Poria, tangerine peel, forsythia and radish seed in Bao He Wan-type formulas. Liver-Stomach Qi stagnation joins Bupleurum, white peony and Cyperus. Weaning starts from 60 g fried Mai Ya, sometimes with raw hawthorn. Write Sheng, Chao or Jiao Mai Ya; do not mix the returning-milk dose with the digestant dose.

How do you choose and store Mai Ya?

Choose large plump grains with intact sprouts, a yellow color and a slightly sweet taste. Mold, moth, broken sprouts, overgrown sprouts or ungerminated grain are inferior. Fried lots are brown-yellow and aromatic; scorched lots are burnt-brown. Store ventilated and dry, protected from moth. Buy pharmacopoeial Mai Ya in the named processed form; do not replace it with ungerminated barley or anonymous barley flakes.

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Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.