Si Wu Tang

What Si Wu Tang is for

This is the formula for skin that is pale, dry and thin, with a dull complexion, slow healing and numbness, where the Blood that gives the skin its colour and substance is insufficient. Four herbs build the Blood and keep it moving, so the nourishment reaches the surface without stagnating. The change on the skin comes over weeks rather than days.

The skin looks under-filled. It is pale and dry, thin rather than plump, and the complexion is dull; hair thins, healing slows, and patches of skin go numb or tingle because Blood is not reaching the surface. There is no redness, no heat and no swelling, only a surface that has lost colour and substance. This is the depleted picture rather than the congested one, and it develops slowly, usually in someone who is already thin or run down.

Shu Di Huang nourishes Blood and Yin deeply and supplies the substance the skin is missing. Dang Gui nourishes and moves the Blood, Bai Shao nourishes and astringes so what is built is held in the tissue, and Chuan Xiong moves it so the richness does not sit still. Three herbs nourish and one moves: that balance is why a rich formula can be taken without congesting the skin, and why colour and texture return gradually.

It suits plain depletion rather than stasis or heat. Fixed discolouration with pain, hot or damp eruptions with redness and weeping, and a digestion too weak to absorb rich herbs all call for a different approach, because a rich tonic would feed the congestion or sit unabsorbed. It is also not for the acute hot phase of a skin condition, where cooling is needed, and unexplained pallor with slow healing needs medical assessment rather than a tonic.

Actions

• Nourishes and builds Blood
• Regulates the Blood
• Gentle movement without stagnation
• Supports the skin, hair and tissue

Properties

• Taste and temperature: Predominantly sweet and pungent with a slightly bitter note. Sweet nourishes Blood, pungent moves it, bitter and sour soften and astringe.
• Organs: Heart, Liver, Spleen
• Channels: Heart, Liver, Spleen

The pattern behind it

The pattern is Blood deficiency. Blood nourishes the skin, hair, sinews and organs, and when it is thin those tissues lose their substance: the skin dries and pales, hair thins, numbness appears and healing slows. The formula builds the Blood and keeps it moving, which is why it is used for the depleted picture rather than for stasis or heat.

Composition

The herbs in Si Wu Tang, with their role and dose.

Patterns it treats

How the formula is built

Three herbs nourish and one moves. That is the whole design: Shu Di Huang, Dang Gui and Bai Shao build the Blood, and Chuan Xiong circulates it so the result does not sit still. It is the foundation on which the Blood formulas are built.

Skin conditions it is used for

Where this formula appears in the skin conditions of the library.

Preparation and use

Decocted in water and taken warm, in two divided doses.

Modifications

• If stasis is present, Tao Ren and Hong Hua are added to make Tao Hong Si Wu Tang.
• If Qi is also deficient, Ba Zhen Tang is used.
• If Heat is present, cooling herbs are added.
• If the digestion is weak, the rich herbs are reduced and support added.

Timing

Taken warm in two divided doses.

Duration

Two to four weeks per course, often taken from after menstruation for five to seven days in gynaecological practice.

Diet while taking it

Nourishing cooked food; avoid cold raw food that weakens the Spleen's ability to make Blood.

Safety

Interactions

Dang Gui may add to anticoagulant effects. No other major interaction is recorded in the reference.

Pregnancy

Use with caution in pregnancy. The formula contains Chuan Xiong and Dang Gui, which move Blood.

Breastfeeding

Considered acceptable under professional guidance.

Children

Used in children with reduced dose for Blood deficiency.

Before you use it

Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription, and unexplained pallor or fatigue needs 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.

• Comparative efficacy of Chinese herbal medicines for dialysis patients with uremic pruritus: A systematic review and network meta-analysis.. Frontiers in pharmacology, 2023. PMID: 36733503.

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, 12th century, developing the earlier Danggui Shaoyao San tradition.

Si Wu Tang became the foundational Blood tonic after it was recorded in the Song imperial formulary, and almost every later Blood formula is built from it: add moving herbs for stasis, add Qi tonics for deficiency of both. On the skin it is the baseline for the pale, dry, depleted picture.

Classical record

Related formulas

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.