What Dan Zhi Xiao Yao San is for
This powder is for skin that flares when stress runs high and has started to show heat: flushing, burning, boils or a scalp that dries and tightens. It moves the constrained Liver Qi and clears the Heat that long constraint has generated, so the surface stops being pushed into angry red flares.
The skin picture is heat on top of tension. Flushing comes and goes with strain, the surface may feel hot to the touch without much swelling, and itching or burning can appear where nothing obvious is visible. Boils and small inflamed spots erupt when the heat finds a weak point, the scalp dries and tightens, and cracked skin at the breast or nipple reopens under the same strain. The colour is often redder at the edges of the face, and the whole picture worsens when life does.
Constraint that lasts long enough generates Heat, and Heat that has no outlet pushes towards the surface. Chai Hu frees the Liver Qi, Mu Dan Pi and Zhi Zi clear the Heat the constraint produced, Dang Gui and Bai Shao nourish the Blood so the surface has something to hold moisture with, and Bai Zhu with Fu Ling support the Spleen so that Dampness does not join the picture. The formula cools and moves at once.
It suits constraint with heat on a base that is not simply depleted. Where there is no stagnation, and the skin is dry because the Blood and Yin are low, the cooling herbs are not the main need and a nourishing approach does better. Where skin is hot, swollen and spreading, or a boil is large and painful, medical care comes first and the formula is supportive at most.
Actions
- Courses the Liver and resolves constraint
- Clears Heat and cools the Blood
- Strengthens the Spleen
- Nourishes Blood
- Settles the spirit
Properties
- Taste and temperature: Predominantly bitter and pungent with sweet underlying tones. Bitter and pungent clear Heat and move stagnant Qi; sweet tonifies the Spleen and harmonises.
- Organs: Liver, Spleen, Heart
- Channels: Liver, Spleen, Heart
The pattern behind it
The root is Liver Qi stagnation that has persisted long enough to generate Heat, on a base of Spleen and Blood deficiency. The stagnation produces the irritability, the tension and the stress-linked flares; the Heat produces the flushing, the bitter taste and the burning. The formula moves the Qi, clears the Heat and supports the Spleen, which is why it addresses both the emotional trigger and the skin response.
Composition
The herbs in Dan Zhi Xiao Yao San, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| King | Chai Hu | 6 to 9 g | Slightly cool, Pungent, bitter | Frees Liver Qi, addressing the stagnation that started the whole picture. |
| Mu Dan Pi | 6 to 9 g | Slightly cold, Bitter, pungent | Clears Heat and cools the Blood, added to the original formula for the heat component. | |
| Zhi Zi | 6 to 9 g | Cold, Bitter | Clears Heat and drains it downward, addressing irritability, flushing and restlessness. | |
| Dang Gui | 9 to 12 g | Warm, Sweet, pungent | Nourishes Blood so the Liver has substance to work with. | |
| Bai Shao | 9 to 12 g | Slightly cold, Bitter, sour | Nourishes Liver Blood and softens the tension that accompanies constraint. | |
| Bai Zhu | 9 to 12 g | Warm, Bitter, sweet | Strengthens the Spleen, which constraint has been disrupting. | |
| Fu Ling | 9 to 12 g | Neutral, Sweet, bland | Supports the Spleen and prevents Dampness from forming. | |
| Bo He | 3 to 6 g | Cool, Pungent | Courses Liver Qi and clears the head, with a light cooling action. | |
| Envoy | Sheng Jiang | 3 to 6 g | Slightly warm, Pungent | Warms the middle and helps the formula sit well in the digestion. |
| Gan Cao | 3 to 6 g | Neutral, Sweet | Harmonises the formula and supports the middle. |
Patterns it treats
Liver Qi Stagnation
Flushing, burning, boils or a dry tight scalp that flare when stress rises, with heat sitting on top of constraint. The Qi is stuck and the Heat it has generated is pushing at the surface.
How the formula is built
The original Xiao Yao San does three things: it frees the Liver Qi, it nourishes the Blood and it strengthens the Spleen. Adding Mu Dan Pi and Zhi Zi adds a fourth: it clears the Heat that prolonged constraint produces. That is why the formula suits the person whose skin flares with stress and who also feels hot, irritable and flushed.
Skin conditions it is used for
Where this formula appears in the skin conditions of the library.
Preparation and use
Taken as a powder in warm water, or as prepared pills, two to three times a day.
Modifications
- If the Heat is marked, the cooling herbs are increased.
- If the Spleen deficiency is marked, the tonics are increased.
- If the Blood deficiency dominates, nourishing herbs are added.
- Where the Heat has become Damp-Heat, draining herbs are added.
Timing
Taken in two or three divided doses through the day.
Duration
Often four to eight weeks for chronic patterns, with one to two weeks sufficient for an acute flare of Liver-Heat symptoms.
Diet while taking it
Reduce alcohol, caffeine and spicy food, and eat at regular times, since irregular eating aggravates the Spleen side of the pattern.
Safety
Contraindications
Caution in Yin deficiency with vigorous Fire where there is no Liver Qi stagnation: the warming and moving herbs can aggravate dryness. Use care in Damp-Heat without adding draining herbs.
Interactions
Gan Cao may interact with diuretics, digoxin and corticosteroids. The formula may add to the effects of sedatives because of the spirit-settling action.
Pregnancy
Use with caution in pregnancy; Chinese patent medicine labelling lists pregnancy as a caution for this formula.
Breastfeeding
Use only under professional guidance.
Children
Used only with professional supervision.
Before you use it
Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription.
General safety references
General references for herbal hepatotoxicity and herb-drug interactions; they are not specific to this formula.
- Review article: Herbal hepatotoxicity - an update on traditional Chinese medicine preparations. Alimentary Pharmacology & Therapeutics, 2014. PMID: 24844799.
- Interactions between herbal medicines and prescribed drugs: an updated systematic review. Drugs, 2009. PMID: 19719333.
- Warfarin and food, herbal or dietary supplement interactions: a systematic review. British Journal of Clinical Pharmacology, 2021. PMID: 32478963.
Selected PubMed records
Real PubMed records for the modern, non-TCM discussion of this formula. They are references, not a claim that the formula is proven for any skin condition.
- Anxiolytic and neuroprotective effects of the Traditional Chinese Medicinal formulation Dan-zhi-xiao-yao-san in a rat model of chronic stress.. Molecular medicine reports, 2016. PMID: 27279479.
Origin and history
Nei Ke Zhai Yao (内科摘要, Internal Medicine Summary) by Xue Ji, Ming dynasty, 1548, as a modification of Xiao Yao San.
Xue Ji added Mu Dan Pi and Zhi Zi to Xiao Yao San in the 16th century, creating the standard formula for Liver constraint that has produced heat. It became especially used in gynaecology and in stress-related conditions, and it fits the skin picture where flares follow emotion and the person is hot and irritable.
Classical record
Xue Ji recorded the modification of Xiao Yao San with Mu Dan Pi and Zhi Zi for constraint that has generated heat, with irritability, flushing, a bitter taste and a wiry pulse.
Nei Ke Zhai Yao (内科摘要, Internal Medicine Summary), Xue Ji, Ming dynasty, 1548.
Evidence note
No controlled trial of this treatment in skin conditions was identified for this entry. What is described here rests on the classical and later materia medica record and on traditional clinical use, not on controlled trial evidence, and it is not a prediction of benefit. Where skin-specific research does exist it is linked above.
Common questions
How is it different from Xiao Yao San?
It is Xiao Yao San plus two cooling herbs, for when the stress has started to produce heat: flushing, irritability, a bitter taste.
Can it help stress-related skin flares?
Yes, for the pattern where flares clearly follow emotional strain and heat signs are present. It is not a general anti-stress formula.
How long does it take?
One to two weeks may settle an acute flare; chronic patterns usually need four to eight weeks with reassessment.
Is it safe in pregnancy?
It is treated as a caution in pregnancy, so professional guidance is needed.