Rongtong Dictionary · Formula

Xiaoyao Powder: Origins, the Logic of Harmonizing Liver and Spleen, the Danzhi-Xiaoyao Lineage, and Modern Depression Evidence

Published and reviewed 2026-07-09

Xiaoyao (Free Wanderer) Powder comes from the Song-dynasty Taiping Huimin Heji Jufang and is the representative formula for 'harmonizing liver and spleen, coursing the liver and resolving constraint, nourishing blood and fortifying the spleen.' Its name borrows the Daoist idea of carefree ease, evoking a constrained liver set free. Descended from Zhang Zhongjing's Sini San liver-coursing method and built from bupleurum, angelica, white peony, atractylodes, poria, and licorice with roasted ginger and mint, it is both a model of 'treating liver and spleen together, tending qi and blood alike' and — because modern research often applies it to depression and anxiety — a textbook case for insisting that a traditional 'liver constraint' pattern is not a modern psychiatric diagnosis, which must be assessed and treated by mental-health professionals.

Origin: the meaning of 'free wanderer' and the Sini San roots

Xiaoyao Powder appears in the Song government formulary Taiping Huimin Heji Jufang. 'Xiaoyao' is a Daoist term from the Zhuangzi's 'Free and Easy Wandering,' meaning carefree, unfettered ease; medicine borrows it to evoke a constrained, depressed liver qi set free to flow so that body and mind return to ease — hence the name. The classical indication is broad: blood-deficiency taxation fatigue, five-center vexing heat, aching limbs, dizzy heavy head, and, where blood-heat contends, irregular menses, abdominal distension and pain, and malaria-like chills and fever.

In formula evolution, Xiaoyao Powder descends from Zhang Zhongjing's Sini San (bupleurum, white peony, bitter orange, licorice) liver-coursing method, adding blood-nourishing and spleen-fortifying agents to develop from 'venting the pathogen and resolving constraint' into 'treating liver and spleen together, tending qi and blood alike.' The classical composition is bupleurum, angelica, white peony, atractylodes, and poria one liang each, and honey-fried licorice half a liang, decocted with a little roasted ginger and mint; the pill form is 'Xiaoyao Wan.' This page identifies the entity only and offers no dose conversion or preparation procedure.

Composition: how 'liver and spleen together, qi and blood alike' is achieved

Eight ingredients: bupleurum (Bupleuri Radix, sovereign), angelica (Angelicae Sinensis Radix, minister), white peony (Paeoniae Radix Alba, minister), atractylodes (Atractylodis Macrocephalae Rhizoma), poria (Poria), honey-fried licorice (Glycyrrhizae Radix), roasted ginger (Zingiberis Rhizoma), and mint (Menthae Herba).

In the textbook reading, bupleurum courses the liver and resolves constraint so liver qi flows freely, as sovereign; angelica nourishes and harmonizes blood and white peony nourishes blood and softens the liver, together aiding bupleurum to supplement the liver's substance and regulate its function, as ministers — addressing both the 'constraint' and the 'blood deficiency.' Because wood-constraint readily impairs spleen transport, atractylodes, poria, and licorice fortify the spleen and boost qi, both 'banking the earth to resist the wood's insult' and providing a source for blood generation; mint disperses constraint and vents liver-channel heat, and roasted ginger warms the stomach and, being aromatic, frees constraint, as assistants; licorice also harmonizes as envoy. The Qing scholar Zhang Bingcheng captured it: the liver 'is firm by nature yet loves free flow, requiring water to moisten it and earth to bank it,' so angelica and peony 'moisten the liver,' poria-atractylodes-licorice 'bank its root,' and bupleurum-mint-ginger, acrid and rising, 'follow the liver's nature so it does not become constrained.' Liver and spleen are treated together, qi and blood alike.

Pattern, not disease: 'liver constraint' is not 'depression'

The textbook core mechanism is 'liver constraint, blood deficiency, spleen weakness.' The liver governs free coursing and stores blood; emotional non-flow constrains liver qi and impairs coursing, so qi stagnates and the flanks ache; constraint reaching the blood, plus spleen-deficient under-generation, yields blood deficiency that fails to nourish the head and eyes, hence headache, dizziness, and dry mouth and throat; failed spleen transport brings fatigue and poor appetite; because a woman's thoroughfare and conception vessels depend on liver and spleen, this pattern disorders them, hence irregular menses and breast distension; the pulse is wiry and weak. The method is 'course the liver, resolve constraint, nourish blood, fortify the spleen.'

A crucial caution: 'liver' and 'liver constraint' are traditional functional constructs — the 'liver' is not the anatomical liver, and 'liver constraint' is emphatically not a synonym for depression, anxiety disorder, bipolar disorder, or any modern psychiatric diagnosis. Modern research often applies the formula to 'depressed' populations, which easily breeds the misreading 'liver constraint = depression.' In fact, depression and anxiety are conditions that mental-health professionals must assess and manage against diagnostic criteria, and are absolutely not a matter for 'home self-treatment.' A traditional 'liver constraint' pattern and a modern depression diagnosis answer different classification questions; similar symptoms do not imply the same pattern or diagnosis.

Historical development: from coursing the liver to clearing heat and nourishing blood

Xiaoyao Powder is the pivot of the 'Xiaoyao' family and of the whole liver-coursing method. Its most famous modification is Ming physician Xue Ji's Jiawei Xiaoyao San (Danzhi-Xiaoyao-San) — adding moutan bark and gardenia to course the liver and fortify the spleen while clearing heat and cooling blood, for constraint transforming into fire with irritability, tidal fever, night sweats, and irregular menses; this is an important derivative separately evaluated in modern depression research. Removing mint and roasted ginger and adding rehmannia yields Hei-Xiaoyao San, strengthening blood nourishment for heavier liver-constraint blood deficiency.

Traced upstream, Xiaoyao Powder joins Sini San and Chaihu Shugan San as bupleurum-based liver-coursing formulas, forming a clear 'course the liver, resolve constraint' lineage: Sini San as the vent-and-resolve base, Xiaoyao adding blood-nourishing and spleen-fortifying, Danzhi-Xiaoyao further adding heat-clearing and blood-cooling. It is also combined with other formulas — with Siwu Decoction to strengthen blood nourishment and regulate menses, with Jinlingzi San to move qi and relieve pain in liver-constraint flank pain. Physicians across internal, gynecological, and ophthalmic medicine used it for liver-constraint-blood-deficiency-spleen-weakness patterns. This 'one formula as pivot, modified and combined into a system' evolution is why it is a classic of formula studies.

Active constituents: saikosaponins, paeoniflorin, and network-pharmacology exploration

In modern terms, the material basis decomposes into each herb's actives: bupleurum's saikosaponins, white peony's paeoniflorin, angelica's ferulic acid and ligustilide, and licorice's glycyrrhizin and flavonoids. Reviews note that white peony and bupleurum are the two most frequently occurring herbs across the depression-related 'liver constraint' formulas. Preclinical work largely uses the chronic-unpredictable-mild-stress (CUMS) depression model: a preclinical meta-analysis of 25 studies and 569 animals (2023) found that Xiaoyao san improved food intake and body weight, restored sucrose preference, and reduced immobility in forced swimming, suggesting involvement of the HPA axis, monoamine neurotransmitters, and hippocampal neuroplasticity.

Network-pharmacology and metabolomics studies further sketch a 'multi-component, multi-target' antidepressant-mechanism hypothesis. The caveat stands: these are largely animal-model and computational prediction — mechanistic exploration, and the 'antidepressant' effect is observed in specific animal models, which cannot be equated with proven efficacy in human depression, and certainly not a basis for using the formula as a 'natural antidepressant' on one's own.

Evidence: how a systematic review is both 'effective' and 'limited'

Xiaoyao Powder is an excellent case for 'a positive signal amid limited quality.' A 2012 systematic review (PMC3159992) included 26 randomized controlled trials totaling 1,837 depression patients: Xiaoyao Powder combined with antidepressants outperformed antidepressants alone on comprehensive effect and on Hamilton (HAMD) and SDS scores; Xiaoyao alone was also superior to antidepressants on HAMD, though not different from placebo on SDS; no adverse effects of Xiaoyao were reported. But the authors stated plainly that the methodological quality of most included trials was low, and the potential benefit needs confirmation by rigorously designed high-quality trials. A separate meta-analysis of Danzhi-Xiaoyao-San (PMID 34968660) likewise concluded 'similar to antidepressants, but larger high-quality RCTs are needed.'

How to state it correctly? First, the most robust positive signal comes from 'Xiaoyao plus antidepressants versus antidepressants alone' — an adjunctive/combination scenario, which cannot be extrapolated to 'Xiaoyao can replace antidepressants.' Second, included studies often used modified formulas (Danzhi-Xiaoyao, Jiawei Xiaoyao capsule), with limited sample size and blinding and high heterogeneity (one review reported I2 = 76.3%). Third, the diagnosis and first-line treatment of depression remain the responsibility of mental-health professionals. The defensible statement is that, as combination therapy, it showed a signal of improving depressive symptoms in specific studies, but the evidence quality is limited and needs high-quality RCT confirmation — not that Xiaoyao is proven to treat depression.

Quality standards, patent medicines, and the Western-drug context

Bupleurum, angelica, white peony, atractylodes, poria, licorice, and mint are all Chinese Pharmacopoeia (2020) materials (white peony by paeoniflorin, bupleurum by saikosaponins). The market offers Xiaoyao Wan, Jiawei Xiaoyao Wan (Danzhi-Xiaoyao Wan), Jiawei Xiaoyao capsule, and more; but 'Xiaoyao Wan' and 'Jiawei Xiaoyao Wan' differ in positioning (the latter also clears liver heat) and are not interchangeable — a distinction easily confused in self-medication.

As contextual overlap (relationship only, not an efficacy comparison): the formula's modern research settings (depression, anxiety, premenstrual tension, menopausal syndrome) correspond at the Western-drug level to categories such as selective serotonin reuptake inhibitors (SSRIs), tricyclic antidepressants, and anxiolytics — indeed, the comparators and co-therapies in the systematic review above were SSRIs and tricyclic or tetracyclic antidepressants. This is adjacency of research setting and comparator only, never equivalence of constituents or efficacy; more importantly, if a patient is on antidepressants, any combination must be assessed by a psychiatrist and pharmacist (for interaction risks such as serotonin syndrome), and antidepressants must never be self-added or self-stopped.

Safety boundaries: mental-health problems are not for 'home self-treatment'

First and foremost: depression, anxiety, and related mental-health problems require professional assessment and management against diagnostic criteria. Persistent low mood, loss of interest, or changes in sleep and appetite — and above all any thought of self-harm or suicide — call for immediate mental-health help or a local crisis line, not self-administered 'liver-coursing.' Never self-stop or self-substitute an antidepressant you are taking.

As for the formula itself: use with caution in yin-deficiency-with-fire; angelica and white peony have some blood-moving action, so pregnant women should use it only under medical guidance; bupleurum and mint may interact with some drugs, and licorice at high prolonged doses may affect blood pressure and electrolytes. Keep an even mood and avoid raw, cold, and greasy food during use. Xiaoyao Powder is an excellent model for the wisdom of 'treating liver and spleen together' and for the pattern-versus-diagnosis distinction, but its clinical use belongs to professional differentiation, and the proper diagnosis and treatment of psychiatric illness must be left to specialists.

A checklist for reading any formula article

1. Composition and preparation: does a stated effect come from the canonical Xiaoyao, from Danzhi-Xiaoyao (Jiawei Xiaoyao Wan), or from Jiawei Xiaoyao capsule? Their heat-clearing power differs and they must not be conflated.
2. Pattern versus disease: has 'liver constraint' been equated directly with depression, anxiety disorder, or another psychiatric diagnosis?
3. Evidence tier and scenario: is the positive result 'monotherapy' or 'combined with antidepressants,' and a human RCT or an animal CUMS model — with what trial quality and heterogeneity?
4. Safety and interactions: does it stress that psychiatric illness needs specialist assessment, that antidepressants must not be self-changed, and the interaction risks of combination?
5. Dose and procedure: responsible education identifies the entity and stops short of individual dosing and modifications — for mood problems, seek professional mental-health help.

Educational and academic reference only. It does not provide a diagnosis, prescription, dosage, or treatment recommendation. Depression, anxiety, and related problems require professional assessment and treatment and are not for home self-treatment; if you have persistent low mood or any thought of self-harm, seek professional mental-health help or a local crisis line immediately, never self-change an antidepressant, and consult a licensed physician and pharmacist for any prescription.