What Shen Ling Bai Zhu San is for
This is the formula for tissue that looks pale, puffy and slow to mend because the Spleen is too weak to turn food into Qi and fluid. Instead of being transformed, the fluid gathers as Dampness, so the skin holds water and repairs itself badly. The formula strengthens the Spleen and drains the Dampness together, since doing one without the other leaves the problem in place.
The surface looks waterlogged rather than inflamed. It is pale, soft and slightly puffy, often around the face and limbs, and it marks easily and heals slowly. Instead of a red weeping rash there may be a stubborn itch or a patch that will not close, and the puffiness gives the tissue a doughy feel under the fingers. The tongue is pale and swollen with a white coat. This sits at the deficient, damp end of the skin spectrum rather than the hot end.
Ren Shen, Bai Zhu, Shan Yao and Lian Zi strengthen the Spleen so it starts producing Qi again; Fu Ling leads by leaching the accumulated Dampness out; Bai Bian Dou and Yi Yi Ren drain what has already formed; Sha Ren keeps the tonics from sitting heavily; Jie Geng lifts Qi to the Lungs, which the tradition treats as the upper source of moisture for the skin; Gan Cao harmonises. Tonics and draining herbs are given together so the tissue is supplied and cleared at once.
It is mild by design and can be taken for weeks, which suits the slow, chronic quality of this skin picture. It is the wrong formula where Heat or Yin deficiency has reddened and dried the tissue, since the warming tonics and the draining herbs would consume the moisture that is left. It also does not suit a greasy, flushed, weeping eruption, which is Damp-Heat rather than deficiency and needs a cooling approach instead.
Actions
- Tonifies Qi
- Strengthens the Spleen
- Drains Dampness
- Stops diarrhoea
- Tonifies Lung Qi
- Harmonises the Stomach
Properties
- Taste and temperature: Predominantly sweet and bland. Sweet tonifies Spleen Qi and nourishes the middle; bland leaches Dampness without harsh drying; Sha Ren adds a light aromatic note that awakens the Stomach.
- Organs: Spleen, Stomach, Lungs, Large Intestine
- Channels: Spleen, Stomach, Lung
The pattern behind it
The root is a Spleen too weak to transform food and fluid. That produces two results at once: too little Qi, so the person tires and the skin looks pale and heals slowly; and too much leftover fluid, so the stools loosen and the tissues feel heavy and puffy. The formula strengthens the Spleen and drains the Dampness together, because doing only one of those leaves the other in place.
Composition
The herbs in Shen Ling Bai Zhu San, with their role and dose.
| Role | Herb | Dose | Properties | Why it is there |
|---|---|---|---|---|
| Ren Shen | 9 to 15 g | Slightly warm, Sweet, slightly bitter | Strengthens Spleen and Lung Qi, addressing the underlying depletion. | |
| Bai Zhu | 9 to 15 g | Warm, Bitter, sweet | Strengthens the Spleen and dries Dampness, the core of the middle-strengthening action. | |
| King | Fu Ling | 9 to 15 g | Neutral, Sweet, bland | Leaches Dampness out through the urine while supporting the Spleen; the leading herb here. |
| Shan Yao | 9 to 15 g | Neutral, Sweet | Tonifies the Spleen gently and firms the stool with a mild astringing quality. | |
| Lian Zi | 6 to 9 g | Neutral, Sweet, astringent | Tonifies the Spleen and Kidney and astringes, helping stop chronic loose stools. | |
| Bai Bian Dou | 9 to 12 g | Slightly warm, Sweet | Tonifies the Spleen and drains Dampness, particularly useful in summer heat with diarrhoea. | |
| Yi Yi Ren | 6 to 9 g | Cool, Sweet, bland | Drains Dampness and supports the Spleen without being harsh. | |
| Sha Ren | 3 to 6 g | Warm, Pungent | Aromatic and warming, it awakens the Stomach and prevents the tonics from causing fullness. | |
| Envoy | Jie Geng | 3 to 6 g | Neutral, Bitter, pungent | Guides Qi upward to the Lungs, which is why the formula also supports Lung Qi. |
| Gan Cao | 3 to 6 g | Neutral, Sweet | Harmonises the formula and supports the middle. |
Patterns it treats
Spleen Qi Deficiency
Pale, puffy, doughy skin that marks easily, itches without erupting and heals slowly. The tissue looks waterlogged rather than inflamed and repairs itself badly.
How the formula is built
The formula is a gentle team rather than one strong action. The tonics restore the Spleen's ability to transform, the bland draining herbs remove the Dampness that accumulated while it was weak, Sha Ren keeps the whole thing moving so it does not sit heavily, and Jie Geng links the middle to the Lungs. That balance is why it can be taken for weeks, and why it is used for depleted damp skin as well as for the gut.
Skin conditions it is used for
Where this formula appears in the skin conditions of the library.
Preparation and use
Traditionally taken as a powder mixed with warm water or as a decoction, in two or three divided doses through the day.
Modifications
- If diarrhoea dominates, the astringing and drying herbs are increased.
- If appetite is very poor, aromatic herbs to awaken the Stomach are added.
- If Cold is present, warming herbs are added.
- If the Lungs are involved with a weak cough, Lung-supporting herbs are increased.
Timing
Taken in two or three divided doses through the day, usually with warm water.
Duration
Commonly two to eight weeks for chronic digestive complaints, then reassessed; it may be continued for months under guidance because it is mild.
Diet while taking it
Avoid cold, raw and greasy food while taking it, as these burden the Spleen the formula is trying to strengthen.
Safety
Contraindications
Avoid where there is Yin deficiency with Heat signs such as a dry mouth, night sweats and a red tongue with little coating, since the warming tonics and draining herbs can consume Yin further.
Interactions
Gan Cao is the main interaction concern: glycyrrhizin can cause potassium loss and raise blood pressure, and it interacts with diuretics, digoxin and corticosteroids. Ren Shen may also affect blood sugar and anticoagulant therapy.
Pregnancy
Generally considered safe in pregnancy under professional guidance, because the herbs are gentle tonics and mild draining agents with nothing harsh. Caution is still warranted because Ren Shen is a strong tonic.
Breastfeeding
Considered acceptable under professional guidance.
Children
Frequently used in children with reduced dose for weak digestion.
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.
- Chinese herbal formula shen-ling-bai-zhu-san to treat chronic gastritis: Clinical evidence and potential mechanisms.. World journal of gastroenterology, 2022. PMID: 36156925.
- Shen-Ling-Bai-Zhu-San alleviates Crohn's disease-like colitis by modulating fatty acid degradation via the peroxisome proliferation-activated receptor pathway: An integrated approach combining network pharmacology, microbiomics, metabolomics, proteomics, and experimental validation.. Journal of ethnopharmacology, 2025. PMID: 40848907.
Origin and history
Tai Ping Hui Min He Ji Ju Fang (太平惠民和剂局方, Formulas from the Imperial Pharmacy), Song dynasty, compiled in the 12th century.
The formula comes from the Tai Ping Hui Min He Ji Ju Fang, the Song government's official formulary, which collected and standardised the formulas in use at the time. Its classical description is unusually practical: it lists poor intake, drowsiness, middle fullness, palpitations, breathlessness, vomiting and diarrhoea, and notes that the formula is balanced and not heating, suitable for longer use to nourish Qi and improve the complexion.
Classical record
治脾胃虚弱，饮食不进，多困少力，中满痞噎，心忪气喘，呕吐泄泻及伤寒咳噫。此药中和不热，久服养气育神，醒脾悦色，顺正辟邪。
It treats Spleen and Stomach weakness, with food not being taken in, much drowsiness and little strength, fullness and blockage in the middle, palpitations and breathlessness, vomiting and diarrhoea, and cough with hiccup after cold damage. The formula is balanced and not heating; taken over time it nourishes Qi and the spirit, awakens the Spleen, improves the complexion and supports what is correct while repelling what is pathogenic.
Tai Ping Hui Min He Ji Ju Fang (太平惠民和剂局方, Formulas from the Imperial Pharmacy), Song dynasty.
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
Why is a digestive formula used for skin?
Because the Spleen produces the Qi and Blood that repair the skin. When it is weak, the skin looks pale, puffy and slow to heal, and the same Dampness that loosens the stool shows in the tissue.
How is it different from Si Jun Zi Tang?
Si Jun Zi Tang is the small four-herb tonic for pure deficiency. This formula adds draining and astringing herbs, so it suits deficiency that has already produced loose stools and puffiness.
Can it be taken for a long time?
Yes, it is designed to be mild and is often used for weeks or months under guidance. It is still reassessed periodically.
Who should avoid it?
Anyone with Yin deficiency and Heat signs such as a dry mouth, night sweats and a red dry tongue, because its warming and draining qualities can consume Yin further.