OthersDigestantMassa Medicata Fermentata

Shen Qu (Medicated Leaven)

Q: What is Shen Qu? Are Liu Shen Qu, Chao Shen Qu, Jiao Shen Qu and Jian Shen Qu the same?

Shen Qu (神曲), also called Liu Shen Qu or Liu Qu , is a fermented cake of fresh Polygonum, Artemisia, Xanthium, bitter apricot kernel and adzuki bean mixed with wheat flour or bran—not a single plant. The usual Latin name is Massa Medicata Fermentata . Chao Shen Qu is stir-fried: less dispersing, better to fortify the Spleen and harmonize the Stomach. Jiao Shen Qu is scorch-fried: stronger to disperse food and stop diarrhea. Jian Shen Qu (Fujian qu) uses a different recipe and also releases the exterior and transforms damp—not an equal swap. It contains wheat bran; do not use in wheat allergy. Write Shen Qu, Chao Shen Qu or Jiao Shen Qu.

Q: What are the TCM properties and traditional uses of Shen Qu?

Traditional sources record Shen Qu as sweet, acrid and warm , entering the Spleen and Stomach channels, acting to disperse food and harmonize the Stomach, fortify the Spleen and regulate the middle . It is used for food stagnation, epigastric-abdominal fullness, poor appetite, vomiting and diarrheal dysentery, and pediatric food accumulation. Sweet-acrid-warm, it disperses food while fortifying the Stomach—suited to middle-jiao food accumulation, not to Spleen-Yin vacuity, Stomach fire or vacuity without accumulation.

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

The usual decoction dose is 6–15 g . It is not a four-season “Shen Qu digestive tea.” Vacuity fire without accumulation only suffers more when dispersed. Food accumulation with fullness needs a practitioner to name fried or scorched and a short course. Hyperacidity and ulcer should not take large long courses. Do not combine it with antibiotics.

Q: How do you choose and store Shen Qu?

Choose intact dry cakes, aged without mold or moths, aromatic, with a fermented porous fracture . Fried pieces are pale yellow; scorched pieces are brown-yellow on the outside with a toasted aroma. Moldy, wormy, sour and scentless lots are discarded. Store in a dry container, airy against moths. Buy identifiable Liu Shen Qu in the named processed form; do not replace it with anonymous “digestive qu” or an equal weight of Jian Qu.

A practical guide to Shen Qu: 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	Massa Medicata Fermentata
Chinese Name & Pinyin	神麴 · Shen Qu
Medicinal Part	Others
The item	Shen Qu is a fermented medicated mass. Mai Ya, Gu Ya, and Shan Zha are different food-dispersing herbs. Common forms: raw, dry-fried, and scorched.
Nature and channels	Sweet, acrid, warm. Enters the Spleen and Stomach. Sweetness harmonizes the middle. Acridity moves stagnation. Warmth assists transport.
Actions and indications	Disperses food and harmonizes the stomach. Used for food accumulation, epigastric and abdominal fullness, and poor appetite.
Pattern cues	Fullness. Sour belching. No desire to eat. Post-meal focal distention.
In this article	Shen Qu versus Mai Ya, Shan Zha, and Gu Ya. Raw versus scorched. Why there must be accumulation. Who should skip it.

What Is Shen Qu?

Shen Qu (神曲; Shén Qū; Latin: Massa Medicata Fermentata; English: medicated leaven) is a fermented mass made from wheat flour, rice bean, and bitter apricot kernel mixed with juices of Artemisia, Xanthium, and Polygonum. In Chinese medicine it is a food-dispersing herb. It is sweet, acrid, and warm, enters the Spleen and Stomach channels, and its core action is to disperse food and harmonize the stomach. It is not a single plant. It is not a probiotic capsule or brewer’s yeast. The “qu” on a prescription means this fermented block. It is not Mai Ya. Barley sprout is better for flour-type food and can also reduce lactation. It is not Shan Zha. Hawthorn leans toward meat accumulation and also dispels stasis. Shen Qu covers a wider range of food stagnation and is traditionally used when food stagnation sits with an exterior pattern. It is a wheat ferment. Tell the practitioner if you are gluten-sensitive.

It is used most often for three patterns:

Food accumulation — epigastric and abdominal fullness, sour belching, no desire to eat
Spleen deficiency with leftover food stagnation — poor appetite, fullness after meals
Food stagnation plus an exterior pattern — pairing belongs with a practitioner, not a DIY “cold leaven”

Raw Shen Qu disperses food more gently. Dry-fried and scorched Shen Qu are stronger at dispersing accumulation. The usual decoction dose is 6–15 g. A weak middle with no accumulation, and Stomach-yin deficiency, should not be over-dispersed. Sweet, acrid, warm, and digestant, it is not a daily “enzyme block.”

After greasy or irregular meals, fullness and sour belching are common. Shen Qu is sweet, acrid, and warm. It disperses and harmonizes, which is why it appears in Bao He Wan. It disperses more than it tonifies. A weak middle with no accumulation, or a red tongue with little fluid, becomes weaker if more dispersing is added.

Shen Qu is not a catch-all digestive. Dispersing when there is no accumulation, or when damp-heat has turned to fire and Stomach yin is already injured, can consume qi and yin. Raw or scorched should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Shen Qu: Materia Medica Profile

Identification & Quality Standard

Massa Medicata Fermentata

Botanical Origin

A fermented preparation of wheat flour with Artemisia, Xanthium, Polygonum and other adjuncts (Massa Medicata Fermentata).

Production Regions

Produced in many provinces; traditionally well known from Fujian, Jiangsu and Beijing workshops.

Quality Requirements

Superior medicinal material is thoroughly fermented, aromatic, and free of moldy or putrid smell.

Macroscopic Features

Squared or irregular cakes, 2~4cm thick; externally yellowish-brown to dark brown, rough, with white or grey mycelial traces; aromatic, sour-fermented odor.

Origin and Quality Identification

Historically, the highest quality Shen Qu comes from Quanzhou (Fujian) and Guangdong.

Appearance: A high-quality piece is an irregular, rough block. It has grayish-white mycelial (fungal) spots on the surface, a crisp texture, and a yellowish-brown interior.
Aroma and Taste: It features a distinct, mild fermented aroma and a slightly bitter, spicy taste.
Processed Differences: The raw version has no scorch marks, the stir-fried version is slightly yellow, and the charred version has obvious dark brown spots and is much crispier.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Sweet, Acrid; WarmSpleenStomach

1. Historical Records

Yao Xing Lun: Stated that it digests trapped food, clears stagnation, and warms the stomach.
Ri Hua Zi Ben Cao: Noted its ability to clear phlegm and assist with postpartum recovery.
Ben Cao Gang Mu: Highlighted its power to aid digestion, relieve bloating, and stop diarrhea, while also noting its use in postpartum care.
De Pei Ben Cao: Emphasized its role in invigorating the Spleen, opening the appetite, and relieving abdominal pain caused by overeating.

2. Evolution of TCM Understanding

Over centuries, different masters highlighted specific strengths of this ferment:

Some, like Li Shizhen, focused on its powerful ability to break down heavy food stagnation.
Others focused on its gentle Spleen-strengthening properties for those who are physically weak but suffering from poor digestion.
Because of its strong "moving" and "breaking" nature regarding stagnation, historical texts frequently advise caution for pregnant women. It is a specialized tool for digestive traffic jams, not a daily supplement.

Core Efficacies & Traditional Applications

Traditional Functions

Reduces food accumulation, harmonizes the stomach, and aids digestion. Apply to epigastric fullness, poor appetite, and diarrhea from food stagnation.

1. Primary Focus: Digesting Food and Harmonizing the Stomach

Traditional Function: Shen Qu (Six Divine Ferment) is highly valued for helping the Spleen and Stomach break down stagnant, undigested food, restoring normal digestive function.
Target Symptoms: It is ideal for the aftermath of overeating—bloating, loss of appetite, a greasy taste in the mouth, loose stools with undigested food, or a thick, greasy tongue coating.
Common Pairings: Frequently combined with Shan Zha (Hawthorn Fruit) and Mai Ya (Barley Sprout) to boost digestive power. If the Spleen is weak, it is paired with Bai Zhu (Atractylodes Rhizome) and Fu Ling (Poria) to protect the digestive system.
When to Avoid: Do not use on its own if you have "Yin Deficiency" (marked by stomach burning and a dry mouth) or "Damp-Heat" (marked by a bitter taste and constipation). Professional guidance is needed here.

2. Secondary Focus: Invigorating the Spleen and Assisting Digestion

Traditional Function: It helps the Spleen and Stomach process fluids and food, improving overall digestive capacity to stop stagnation from coming back.
Target Symptoms: Great for chronic weak digestion, where even a small meal causes bloating, accompanied by fatigue, loose stools, and a thin, white, greasy tongue coating.
Common Pairings: Often matched with Qi-boosting herbs like Dang Shen (Codonopsis Root) and Bai Zhu (Atractylodes Rhizome), or Qi-moving herbs like Chen Pi (Tangerine Peel).
When to Avoid: Skip this approach if you are experiencing severe acute bloating with vomiting, or if you have an active fever from an external cold/flu.

3. Common Herb Pairings: The Synergistic Duo

A classic TCM pairing is Shen Qu (Six Divine Ferment) with Shan Zha (Hawthorn Fruit).

The Synergy: While Shen Qu handles general food stagnation and supports the Spleen, Shan Zha is a specialist at breaking down heavy meats and fats. Together, they clear out almost any type of food "traffic jam."
Safety Note: While effective, people with very weak digestion should not use this strong combination long-term without professional advice.

Modern Research

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

1. Main Chemical Components

Modern science reveals that Shen Qu contains various digestive enzymes, including amylase, lipase, and protease, alongside volatile oils, flavonoids, and organic acids (like succinic acid) produced during fermentation. While lab tests show these enzymes effectively break down starches, fats, and proteins, it is important to remember that test-tube results do not automatically equal human clinical outcomes.

2. Modern Pharmacological Focus

Current scientific research generally looks at two main areas:

Digestive Support: How the enzymes in the ferment help break down complex macronutrients, potentially easing the burden on the stomach.
Gut Motility: Animal studies suggest that extracts can stimulate smooth muscle contractions in the gut, helping to physically move food along and relieve bloating.

3. Limitations of Modern Research

While the science is promising, it has limits:

Lab vs. Life: Animal and cell studies do not perfectly mirror complex human digestion.
Format Differences: Modern studies often use highly concentrated extracts or isolated enzymes, which behave differently than brewing or consuming the traditional fermented block.
The Holistic Effect: TCM relies on the synergy of the whole fermented mixture. Pinpointing a single enzyme does not fully explain the comprehensive healing effect observed in traditional practice.

Comparing Similar Herbs

1. Shared Traits

Both Shen Qu (Six Divine Ferment) and Mai Ya (Barley Sprout) are famous for digesting food and harmonizing the stomach. Both treat bloating from overeating and are commonly found in Spleen-tonifying formulas or gentle dietary teas.

2. Core Differences

Nature: Shen Qu is neutral and safe for most body types. Mai Ya is slightly warm, which is great for cold digestion but can worsen internal heat if used long-term.
Core Strength: Shen Qu clears general food stagnation while actively boosting the Spleen. Mai Ya specializes in breaking down starches (rice, noodles, potatoes) and has a unique ability to stop breast milk production (lactation).
Action: Shen Qu naturally lifts energy, helping the body absorb nutrients. Mai Ya focuses more on smoothing out stagnant Qi to relieve gas and tightness.
When to Avoid: Avoid Shen Qu for Yin deficiency or Damp-Heat. Avoid Mai Ya if you run "hot" or if you are a nursing mother trying to maintain your milk supply.

3. A One-Sentence Summary

Shen Qu handles general food stagnation while gently supporting the Spleen, whereas Mai Ya specifically targets starchy food stagnation and helps regulate trapped digestive gas.

Classical Formulas Containing Shen Qu

Bao He Wan

保和丸Minister

Formula CategoryDigestive FormulasPrimary PatternFood StagnationPrimary FunctionPromote digestion, resolve food stagnationRelated ConditionsIndigestion·Bloating·Poor Appetite·Stomach Discomfort

View Formula Profile Read Complete Guide

Yue Ju Wan

越鞠丸Assistant

Formula CategoryQi-Regulating FormulasPrimary PatternQi StagnationPrimary FunctionRegulate Qi, resolve stagnation of the Six ConstraintsRelated ConditionsChest Tightness·Bloating·Emotional Depression·Poor Appetite

View Formula Profile Read Complete Guide

Zhi Shi Dao Zhi Wan

枳實導滯丸

Formula CategoryDigestive FormulasPrimary PatternFood StagnationPrimary FunctionGuide out stagnation, clear heat, drain dampRelated ConditionsBloating·Abdominal Pain·Diarrhea·Indigestion

View Formula Profile Read Complete Guide

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 and Drinks

Digestive Harmony Tea:
- Ingredients: 6g Shen Qu (Six Divine Ferment), 3g Chen Pi (Tangerine Peel), 3g Chao Mai Ya (Stir-fried Barley Sprout).
- Method: Rinse the herbs, place in a teapot, steep with boiling water for 10 minutes, and drink.
- Best For: Post-holiday bloating, a greasy mouth after heavy meals, or mild chronic indigestion.
- Not For: People with Yin deficiency (dry mouth, dry tongue) or constipation. Limit to 1–2 times a week. Do not use as a daily beverage.

2. Brewing and Processing Differences

Sheng Shen Qu (Raw) is best for mild stomach upset.
Chao Shen Qu (Stir-fried) is stronger for active food stagnation.
Jiao Shen Qu (Charred) is explicitly used for diarrhea caused by overeating. When making tea at home, you can simply steep it in hot water. Note that herbal extracts or capsules require different dosing than raw herbs—always follow product labels.

3. Dosage and Usage Cycle

Clinical doses range from 6–12g. For home dietary use, stick to a gentler 3–6g. Do not use Shen Qu continuously; stop after 3 days or once your symptoms improve. Children, the elderly, and those with very weak digestion should halve the dose and consult a professional first.

Contraindications & Safety Warnings

1. Who Should Avoid It

Yin Deficiency & Damp-Heat: Avoid if you have a burning stomach, dry mouth, red tongue, or if you suffer from bitter taste and constipation.
Special Populations: Pregnant and nursing women must be cautious due to a lack of safety data and its "moving" nature. Children and the elderly require adjusted doses.
Medical Conditions: People with liver or kidney impairment, those undergoing chemo/radiation, or anyone allergic to the raw ingredients (like wheat or almonds) should consult a doctor before use.

2. Drug Interactions and Dietary Notes

Interactions: The digestive enzymes in Shen Qu might alter how certain medications are absorbed, especially antibiotics, blood thinners, or diabetes drugs. Separate taking this herb and your prescription meds by 1 to 2 hours.
Dietary Notes: While using this herb to clear stagnation, avoid cold, raw, greasy, or heavily spicy foods, as they will only add to the stomach's burden and cancel out the herb's benefits.

3. Adverse Reactions and Overdose Risks

When used correctly, side effects are rare. However, taking too much can cause stomach upset, nausea, or vomiting. Allergic reactions (rash, itching) are possible due to the complex fermented ingredients. If you experience persistent vomiting, breathing difficulties, or severe allergic symptoms, stop immediately and seek medical care.

Frequently Asked Questions About Shen Qu

What is Shen Qu? Are Liu Shen Qu, Chao Shen Qu, Jiao Shen Qu and Jian Shen Qu the same?

Shen Qu (神曲), also called Liu Shen Qu or Liu Qu, is a fermented cake of fresh Polygonum, Artemisia, Xanthium, bitter apricot kernel and adzuki bean mixed with wheat flour or bran—not a single plant. The usual Latin name is Massa Medicata Fermentata. Chao Shen Qu is stir-fried: less dispersing, better to fortify the Spleen and harmonize the Stomach. Jiao Shen Qu is scorch-fried: stronger to disperse food and stop diarrhea. Jian Shen Qu (Fujian qu) uses a different recipe and also releases the exterior and transforms damp—not an equal swap. It contains wheat bran; do not use in wheat allergy. Write Shen Qu, Chao Shen Qu or Jiao Shen Qu.

What are the TCM properties and traditional uses of Shen Qu?

Traditional sources record Shen Qu as sweet, acrid and warm, entering the Spleen and Stomach channels, acting to disperse food and harmonize the Stomach, fortify the Spleen and regulate the middle. It is used for food stagnation, epigastric-abdominal fullness, poor appetite, vomiting and diarrheal dysentery, and pediatric food accumulation. Sweet-acrid-warm, it disperses food while fortifying the Stomach—suited to middle-jiao food accumulation, not to Spleen-Yin vacuity, Stomach fire or vacuity without accumulation.

How do you choose raw, stir-fried and scorch-fried Shen Qu?

Heavier food accumulation with an exterior pattern may use the raw cake. Spleen-vacuity poor appetite and epigastric fullness more often use Chao Shen Qu; Food-damage diarrhea and unresolved accumulation more often use Jiao Shen Qu. Break it into the decoction. Aged stock is traditionally preferred. Do not mix it with Jian Qu.

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

The usual decoction dose is 6–15 g. It is not a four-season “Shen Qu digestive tea.” Vacuity fire without accumulation only suffers more when dispersed. Food accumulation with fullness needs a practitioner to name fried or scorched and a short course. Hyperacidity and ulcer should not take large long courses. Do not combine it with antibiotics.

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

Unsuited to Spleen-Yin vacuity and exuberant Stomach fire; use caution in pregnancy (classics record that it “can drop the fetus”). Forbid in wheat or gluten allergy. Do not take long without food accumulation. Stop if dry mouth, clamoring Stomach and dry stool appear.

Can Shen Qu disperse food, stop diarrhea and open the appetite?

It can help middle-jiao food accumulation. Epigastric fullness from food stagnation joins crataegus, malt, radish seed, tangerine peel, Pinellia, Poria and Forsythia in Bao He Wan. It is especially suited to starchy and alcoholic accumulation—not a specific for every bloating, every diarrhea or every anorexia. Severe abdominal pain, high fever and bloody stool are emergencies.

Can Shen Qu be taken daily as a hangover or digestive snack?

Occasional food accumulation may enter a short formula; Yin-deficiency Stomach fire only grows drier. “Shen Qu sobers and digests” does not replace gastroenterology. Dispersing food and harmonizing the Stomach should name fried or scorched and a 6–15 g dose, and distinguish it from Jian Qu.

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

Medicated leaven is sweet-acrid-warm: disperses food and harmonizes the Stomach—leaning to flour and alcohol stagnation. Crataegus is sour-sweet and slightly warm: disperses food, transforms accumulation, moves Qi and dissipates stasis—leaning to meat and grease. Malt is sweet-neutral: moves Qi, disperses food and withdraws milk—leaning to rice and flour stagnation. Radish seed is acrid-sweet-neutral: disperses food, eliminates distention, directs Qi downward and transforms phlegm—stronger for bloating. Chicken gizzard lining is sweet-neutral: fortifies the Stomach, disperses food, astringes essence and transforms stones—for firmer accumulation. Flour-alcohol stagnation favors Shen Qu; meat accumulation favors Shan Zha; grain-flour stagnation favors Mai Ya; marked distention favors Lai Fu Zi. They may be paired; all are wrong as pure dispersing in Yin-deficiency Stomach fire, and Shen Qu contains wheat bran.

Which herbs is Shen Qu combined with? What are the representative formulas?

Food accumulation with epigastric fullness joins crataegus, dry-fried malt, radish seed, tangerine peel, Pinellia, Poria and Forsythia in Bao He Wan. Write Shen Qu, Chao Shen Qu or Jiao Shen Qu; do not dispense Jian Qu, and first confirm there is no wheat-bran allergy.

How do you choose and store Shen Qu?

Choose intact dry cakes, aged without mold or moths, aromatic, with a fermented porous fracture. Fried pieces are pale yellow; scorched pieces are brown-yellow on the outside with a toasted aroma. Moldy, wormy, sour and scentless lots are discarded. Store in a dry container, airy against moths. Buy identifiable Liu Shen Qu in the named processed form; do not replace it with anonymous “digestive qu” or an equal weight of Jian Qu.

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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.