Yi Gong San
Star异功散 (Extraordinary Merit Powder)
Source: Xiao Er Yao Zheng Zhi Jue — Qian Yi (1119)
Last updated October 1, 2026
Description
Yi Gong San (Extraordinary Merit Powder), from the Xiao Er Yao Zheng Zhi Jue (Craft of Medicinal Treatment for Childhood Disease Patterns) by Qian Yi — a variation of Si Jun Zi Tang.
Actions: Tonifies and regulates qi; Strengthens the Spleen; Harmonizes the Stomach.
Presentation: Spleen and Stomach deficiencies with qi stagnation: poor appetite, fullness and discomfort of the chest and epigastrium, vomiting, and diarrhea.
Composition: Si Jun Zi Tang plus Chen Pi. Source uses equal amounts; bracketed doses are modern suggestions.
Source: Chen JK, Chen TT. Chinese Herbal Formulas and Applications: Pharmacological Effects & Clinical Research. Art of Medicine Press, 2009, p. 525.
Composition
| Herb | Amount | % | Role | Function |
|---|---|---|---|---|
|
Ren Shen
dose printed as 6-9g; as printed: Ren Shen (Radix et Rhizoma Ginseng) [6-9g]
|
g | — | — | |
|
Bai Zhu
dose printed as 6-9g; as printed: Bai Zhu (Rhizoma Atractylodis Macrocephalae) [6-9g]
|
g | — | — | |
|
Fu Ling
dose printed as 6-9g; as printed: Fu Ling (Poria) [6-9g]
|
g | — | — | |
|
Gan Cao
dose printed as 3-6g; as printed: Gan Cao (Radix et Rhizoma Glycyrrhizae) [3-6g]
|
g | — | — | |
|
Chen Pi
dose printed as 6-9g; as printed: Chen Pi (Pericarpium Citri Reticulatae) [6-9g]
|
g | — | regulates qi |
Preparation
Grind equal amounts to powder; cook 6g with 5 slices Sheng Jiang and 2 Da Zao in a large bowl of water down to 70%; take warm before meals. Today decocted with bracketed doses.
Relationships
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Formula family
Full herb lists
- Xiang Sha Yang Wei Tang = this formula + Bai Dou Kou, Cang Zhu, Hou Po, Mu Xiang, Sha Ren and Xiang Fu
- Jian Pi Wan = this formula + Xiang Lian Wan + Mai Ya, Shan Yao, Shan Zha, Shen Qu, Rou Dou Kou and Sha Ren
Each entry reads as the larger formula written out: “+” adds its other catalogue cores, then the herbs none of them hold. A catalogue formula counts as a core only when at least 80% of its herbs are present, no more than 1 is absent, and the absent herb is not its chief.
Formula Network
Formulas that share herbs with this one — the closer to the centre, the stronger the match. Click a node to explore.
Similar Formulas by composition
Match score combines dosage-weighted composition (cosine, 70%) with shared-herb overlap (Jaccard, 30%).
Traditional formula information is for educational purposes only. Herbal formulas should be prescribed by a qualified practitioner — dosages and combinations are individualized and can interact with medications.
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