What Yu Ping Feng San is for
The name means jade windscreen: a screen across the surface rather than an attack on anything. The skin picture is a surface that does not hold. It reacts to wind and draughts, flares in the same way again and again, and looks pale and thin rather than red.
The skin looks under-defended rather than inflamed. It is pale, thin and slightly cool, and it reacts to wind, draughts and changes of temperature with weals, blotches or a flush that fades as quickly as it appeared. Between reactions it can look almost normal, which is the point: nothing is fixed in the tissue, only the readiness to react is out of proportion. That is why the pattern is read as a surface that is weak and leaky rather than one under attack, and why a reaction can arrive after a draught when there is no other trigger in sight.
The same weakness shows in the tissue as a loss of tone: the skin does not hold its own moisture and can feel clammy at rest. Huang Qi consolidates the exterior and stops that leak, Bai Zhu strengthens the Spleen that produces the Qi which holds the surface, and Fang Feng dispels Wind lightly without prising the surface open. A Wind herb inside a consolidating formula is the design's cleverness: a small amount of dispersion keeps the tonics from stagnating and lets them hold the surface more firmly.
Because it builds rather than suppresses, the change in the skin is slow. It is taken between flares, over weeks, so that reactions become less frequent and less ready; it is not a treatment for an eruption that is already under way. It is paused during an active infection, when tonics could hold the pathogen in, and it is not for skin that is red, hot and weeping, which is a different direction entirely.
Actions
- Tonifies Qi
- Consolidates the exterior
- Stops spontaneous sweating
- Dispels Wind gently
Properties
- Taste and temperature: Predominantly sweet and slightly pungent. Sweet tonifies and consolidates, pungent dispels Wind lightly without opening the surface.
- Organs: Lungs, Spleen
- Channels: Lung, Spleen
The pattern behind it
The root is Qi deficiency of the Lungs and Spleen, which leaves the surface weak and the pores poorly controlled. The result is a body that leaks sweat and admits pathogens easily. The formula tonifies the Qi and consolidates the surface, which is why it reduces recurrence rather than treating an established eruption.
Composition
The herbs in Yu Ping Feng San, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| Deputy | Huang Qi | 15 to 30 g | Slightly warm, Sweet | Consolidates the exterior and stops spontaneous sweating, the main action of the formula. |
| King | Bai Zhu | 15 to 30 g | Warm, Bitter, sweet | Strengthens the Spleen, the source of the Qi that builds the surface defence. |
| Fang Feng | 6 to 10 g | Slightly warm, Pungent, sweet | Dispels Wind lightly without weakening the surface, which is why it is included in a consolidating formula. |
Patterns it treats
Protective Qi Deficiency
Pale, thin skin that reacts to wind and draughts, breaking into weals or blotches that recur in the same way and then fade. The surface is weak and leaky rather than inflamed, so no fixed lesion forms and the reaction comes and goes with the weather.
How the formula is built
Two tonics and one dispersing herb. The tonics build and hold the surface; Fang Feng prevents the tonics from becoming too cloying and helps them work by dispersing whatever Wind is already there. That is why a formula for a weak surface contains a Wind herb, and why it reduces recurrence rather than suppressing an eruption.
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 decocted, in two or three divided doses.
Modifications
- If sweating is marked, the astringing action is increased.
- If allergies dominate, herbs that dispel Wind are added.
- If the Spleen is weak, digestive support is increased.
- During an acute infection, the formula is paused until it clears.
Timing
Taken in two or three divided doses.
Duration
Two to four weeks per course, often repeated over one to three months, with periodic reassessment.
Diet while taking it
Warm cooked nourishing food; avoid cold and raw food that weakens the Spleen.
Safety
Contraindications
Avoid during an active exterior pattern: with fever, chills or an acute infection, the tonics can hold the pathogen in, so the formula is paused and resumed afterwards. Avoid in Damp-Heat or Yin deficiency with Heat.
Interactions
Huang Qi can affect blood sugar and immune function, so medical advice is needed in diabetes or on immunosuppressants.
Pregnancy
Generally considered safe in pregnancy, as none of the three herbs has abortifacient or uterine-stimulating properties, though professional guidance is appropriate.
Breastfeeding
Considered acceptable under professional guidance.
Children
Frequently used in children for recurrent colds, in reduced dose.
Before you use it
Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription, and recurrent infections or unexplained sweating need medical assessment.
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.
- Yu-Ping-Feng-San alleviates inflammation in atopic dermatitis mice by TLR4/MyD88/NF-κB pathway.. Journal of ethnopharmacology, 2024. PMID: 38604509.
- Chinese medicine Yu-Ping-Feng-San attenuates allergic inflammation by regulating epithelial derived pro-allergic cytokines.. Chinese journal of natural medicines, 2019. PMID: 31514984.
Origin and history
Yi Fang Kao (医方考, Investigations of Medical Formulas) by Wu Kun, Ming dynasty, 1584.
Wu Kun named the formula in 1584, and its image of a jade screen has made it one of the best-known preventive formulas in the tradition. It is used between illnesses rather than during them, with the aim of reducing how often the surface is breached, which is why it fits recurrent urticaria and repeated colds.
Classical record
Wu Kun recorded the three herbs as a formula for a weak surface that sweats spontaneously and admits Wind easily, describing it as a screen that protects rather than attacks.
Yi Fang Kao (医方考, Investigations of Medical Formulas), Wu Kun, Ming dynasty, 1584.
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
Can it be taken during a flare?
It is a preventive formula and is paused during an acute infection or flare, then resumed afterwards once the surface has settled.
Why does a tonifying formula contain Fang Feng?
A small amount of Wind dispersion prevents the tonics from stagnating and helps them consolidate the surface more effectively.
How long does it take to work?
Weeks, because it builds the defence rather than suppressing symptoms. Courses of two to four weeks are typical, repeated over months.
Can it help chronic hives?
For the recurrent pattern on a weak surface, yes, used between episodes. Hives with an identified trigger need that trigger addressed.