The Formula Kitchen 方剂
逍遥散 xiāo yáo sàn
Free and Easy Wanderer Powder · from Taiping Huimin Heji Ju Fang, c. 1107
“The prescription for being wound too tight. When stress knots the qi and the knot starts wearing out the body, this is the tradition's most famous answer.”
— Lao Xinglin
What's in the pot
| Herb | Role | Classical amount |
|---|---|---|
| 柴胡 chái hú | Chief — courses the liver, unknots constraint | 30 g |
| 当归 dāng guī | Deputy — nourishes and moves the blood | 30 g |
| 白芍 bái sháo | Deputy — preserves yin, softens the liver | 30 g |
| 白术 bái zhú | Assistant — strengthens the spleen | 30 g |
| 茯苓 fú líng | Assistant — drains damp, calms the middle | 30 g |
| 炙甘草 zhì gān cǎo | Envoy — harmonizes the whole | 15 g |
| 薄荷 bò he | Envoy — a breath of dispersal | small amount |
| 煨姜 wēi jiāng | Envoy — warms the middle | small amount |
The pattern it treats
Nine hundred years ago, an imperial pharmacy manual recorded a powder for people whose liver qi had become constrained — stuck by stress and emotion — while the digestion weakened underneath and the blood ran thin[1]. The picture it paints is instantly recognizable: irritability and low mood, sighing, tight flanks and temples, poor appetite, fatigue, and, in women, menstrual irregularity. The name is the prescription's promise: to wander free and easy again, like the carefree sage of Zhuangzi's famous chapter.
How the team works
Chai hu unknots; dang gui and bai shao feed and soften what the unknotting strains; bai zhu and fu ling shore up the digestion; licorice, mint, and a sliver of roasted ginger harmonize and disperse[1]. It is the tradition's most elegant lesson in treating the person around the symptom.
What the research says
Xiao Yao San (and its "augmented" sibling Jia Wei Xiao Yao San) is among the most-studied classical formulas for mood. A 2023 systematic review and meta-analysis found it effective for anxiety symptoms with a good safety profile across included trials — while, as usual, calling for larger and better-blinded studies[2].
Deep dive
This formula has an entire dedicated reference of its own: xiaoyaosan.com — ingredient monographs, evidence, safety, variants, and history, from the same grove.
References
- Scheid, Bensky, Ellis & Barolet, Chinese Herbal Medicine: Formulas & Strategies, 2nd ed., Eastland Press, 2009. ↩
- Wang Y, Chen X, Wei W, et al. Efficacy and safety of the Chinese herbal medicine Xiao Yao San for treating anxiety: a systematic review with meta-analysis and trial sequential analysis. Front Pharmacol. 2023;14:1169292. PMID 37905203. https://pubmed.ncbi.nlm.nih.gov/37905203/ ↩
Reviewed 2026-08-25