Shen Qu (神曲) — TCM Digestive Herb | Fermented Massa Medicata

At a Glance

• Herb: Shen Qu
• Chinese name: 神曲 (Shén Qǔ)
• Latin name: Massa Medicata Fermentata
• Nature: Warm
• Taste: Sweet / Acrid
• Meridian: Spleen / Stomach
• Category: Herbs that Relieve Food Stagnation
• Introduction: Shen Qu (神曲, Massa Medicata Fermentata) is a fermented preparation made from a mixture of wheat flour, bran, and various herbal juices — typically including those of Xing Ren (杏仁), Chi Xiao Dou (赤小豆), Qing Hao (青蒿), Cang Er (苍耳), and Liao (蓼). This fermentation process creates an herbal mass whose combined digestive, aromatic, and qi-moving properties make it one of the most versatile digestants in the classical materia medica. First catalogued systematically in the Ming dynasty, Shen Qu has been a mainstay of Chinese herbal formulas addressing food stagnation with concurrent exterior conditions or digestive weakness.

Action

• Reduces food stagnation and strengthens the Stomach: Shen Qu is especially effective for stagnation of grains, starches, and alcohol. Its warm, acrid nature disperses accumulation while its sweet quality supports Stomach qi. 2. Harmonizes the Middle Jiao: Relieves epigastric fullness, belching, and nausea arising from food stagnation or digestive weakness. 3. Facilitates digestion of minerals and heavy substances: Classically combined with mineral-containing pills to aid their absorption and prevent injury to the Stomach. 4. Mildly releases the exterior: Its acrid dispersing quality provides gentle relief of mild wind-cold accompanying interior food stagnation.

Clinical Application

• Shen Qu is indicated for food stagnation presenting with epigastric distension, fullness, lack of appetite, belching with food odour, and loose stools or diarrhea. It is particularly suited when stagnation involves starchy foods, grains, or alcohol. In clinical practice it is often combined with Shan Zha for meat and fat stagnation and Mai Ya for grain stagnation, forming the classic ‘three immortals’ trio (三仙) with Lai Fu Zi or separately as Jiao San Xian. Shen Qu is also routinely added to formulas containing heavy minerals (e.g., magnetite Ci Shi, realgar Xiong Huang) to protect the Stomach and aid assimilation.

Precautions

• Use with caution in patients with Spleen-Stomach yin deficiency presenting with heat signs (dry mouth, burning epigastrium). Charred Shen Qu (Jiao Shen Qu) is preferred when stagnation is accompanied by loose stools or diarrhea. Avoid high doses in pregnancy. Gluten-containing substrate — consider in patients with wheat sensitivity.

Formula

• Jiao San Xian (焦三仙): Charred Shen Qu, Shan Zha, and Mai Ya in equal parts — classical digestive trio for comprehensive food stagnation.
• Jian Pi Wan (健脾丸): Contains Shen Qu with Bai Zhu, Fu Ling, and other tonics — for chronic Spleen deficiency with food stagnation.
• Zhi Shi Dao Zhi Wan (枳实导滞丸): Contains Shen Qu with Zhi Shi, Da Huang, and Huang Lian — for damp-heat food stagnation with constipation.

Combinations

• Shen Qu + Shan Zha + Mai Ya (三仙 / Jiao San Xian): The classical trio for comprehensive food stagnation — grains, meats, and fats. Source: Danxi’s Experiential Therapy (丹溪心法).
• Shen Qu + Bai Zhu + Fu Ling: Strengthens the Spleen while reducing stagnation; used when digestive weakness underlies food retention. Source: Beneficial Formulas from the Taiping Imperial Pharmacy (太平惠民和剂局方).
• Shen Qu + Cang Zhu + Hou Po: For damp-stagnation with epigastric fullness and loose stools. Source: Revised Popular Guide (重订通俗伤寒论).
• Shen Qu + Zhi Shi: Moves qi and dissolves accumulation; addresses hard epigastric masses from combined qi stagnation and food retention. Source: Formulas from the Discussion of Cold Damage (伤寒论方).

Pharmacological Effects

• Amylase and protease components significantly
  • Digestive enzyme activity: enhance the breakdown of starches and proteins in vitro and in animal models
• Extracts
  • Prokinetic effects: promote gastric emptying and intestinal peristalsis in rodent studies
• Anti-diarrheal action
  • Fermentation metabolites have shown mild antimicrobial activity against common enteropathogens
• Ergosterol and B-vitamin content may
  • Hepatoprotective effects: support liver metabolism of ingested fats and alcohol

Classic Description

• 《本草纲目》(Bencao Gangmu, 1596): ‘神曲，消食下气，化痰逆，除烦闷，回食野鸡病。健脾暖胃，消谷化水，治赤白痢，疟疾，产后血晕，小儿腹坚。’ (Shen Qu disperses food, descends qi, transforms phlegm counterflow, eliminates vexation and oppression, and treats regurgitation. It fortifies the Spleen, warms the Stomach, digests grain and water, and treats red-white dysentery, malaria, postpartum blood dizziness, and abdominal hardness in children.)
• 《药性论》(Yaoxing Lun, Tang dynasty): ‘神曲，化水谷宿食，癥结积滞，健脾暖胃。’ (Shen Qu transforms water-grain accumulation, chronic food retention, and concretion-conglomeration; it fortifies the Spleen and warms the Stomach.)
• 《本草经疏》(Bencao Jingshu, 1625): ‘神曲乃酒糵之属，其气味甘辛温，能开胃消食，化积滞而健脾。’ (Shen Qu belongs to the category of fermented leaven. Its qi and flavour are sweet, acrid, and warm, capable of opening the Stomach, dispersing food, transforming accumulation, and fortifying the Spleen.)