TCM Skin CompendiumEducational reference

Classical formula

Sheng Mai San

生脉散 shēng mài sǎn also known as Sheng Mai Powder, Generate the Pulse Powder

In skin practice, Sheng Mai San is used where the picture is oily sweat, dry scalp, cyanosis, breast blister.

Ren Shen restores the spent Qi that drives the pulse and holds the surface, Mai Dong nourishes Yin and generates the fluids the tissue lacks, and Wu Wei Zi astringes so the sweat does not keep draining what the other two build. It suits the dry, depleted convalescent stage and is held back while a fever, chill or active infection is unresolved, since the astringent quality can trap the pathogen.

3Herbs
4Actions
1Patterns
4Conditions
2Related
Powder (San)Qi-tonifying formulasYin-nourishing formulas

What Sheng Mai San is for

This is the formula for skin gone thin and dry with a surface that no longer holds its moisture. Sweating continues after the least effort and the tissue looks depleted rather than inflamed, often after an illness or a long stretch of overwork. Restoring Qi, rebuilding fluid and closing the leak are done in one movement.

The surface reads as dry, thin and easily flushed, and it does not hold what it is given: moisture seems to pass straight through, and sweating carries on after exertion or in the heat. The flush comes and goes with effort rather than staying fixed, and the tissue has a tired, undernourished look instead of a red inflamed one. This is skin that has been running on empty and leaking at the same time, so it never catches up.

Ren Shen restores the Qi that drives the pulse and holds the surface closed; Mai Dong nourishes Yin and generates the fluids the tissue lacks; Wu Wei Zi astringes, so the sweat does not keep draining away what the other two build. Without the astringent herb the moisture would be lost as fast as it was replaced, which is why the three are given together and not as separate remedies.

It waits until the acute illness has settled. While a fever, chill or active infection is still running, the astringent quality can hold the pathogen in, so the formula is used only once the exterior is clear. It is also not for skin that is greasy, puffy or weeping, where Dampness or Phlegm is the problem rather than leakage, and an astringent formula would make that worse.

Actions

  • Tonifies Qi
  • Generates fluids
  • Nourishes Yin
  • Astringes and prevents loss of fluids

Properties

  • Taste and temperature: Predominantly sweet and sour. Sweet from Ren Shen and Mai Dong tonifies Qi and nourishes Yin; sour from Wu Wei Zi astringes and prevents further loss.
  • Organs: Heart, Lungs
  • Channels: Heart, Lung

The pattern behind it

The pattern is Qi and Yin deficiency with leakage. Qi is exhausted so the pulse weakens and breathing shortens; Yin and fluids are depleted so the mouth dries and heat appears; and the surface is not held so sweat continues. The formula restores both and closes the leak.

Composition

The herbs in Sheng Mai San, with their role and dose.

RoleHerbDosePropertiesWhy it is there
King Ren Shen 9 to 15 g Slightly warm, Sweet Strongly tonifies Qi, restoring the force that drives the pulse and holds the surface.
King Mai Dong 9 to 15 g Slightly cold, Sweet, bitter Nourishes Yin and generates fluids, addressing the dryness and the thirst.
Wu Wei Zi 3 to 6 g Warm, Sour Astringes the Qi and fluids so the sweat and the depletion do not continue.

Patterns it treats

Yin Deficiency

Dry, thin skin that flushes with effort and never seems to hold its moisture, with sweating that continues after the least exertion. The surface looks depleted rather than inflamed.

How the formula is built

Three herbs with three jobs that depend on each other: Ren Shen restores the Qi, Mai Dong restores the fluid, and Wu Wei Zi closes the leak so both stay. Without the astringent herb the person would continue to sweat away what the first two built.

Skin conditions it is used for

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

Oily sweat

Where sweating is excessive with a depleted, dry picture rather than heat alone.

 Dry scalp

Dryness on a Qi and Yin deficiency base with fatigue and sweating.

 Cyanosis

Only as supportive care after medical assessment: discolouration needs a diagnosis first.

 Breast blister

Slow healing in a depleted person rather than an acute infective picture.

Preparation and use

Taken as a powder in warm water, or decocted, in two or three divided doses.

Modifications

  • If the sweating is severe, the astringing herb is increased.
  • If dryness dominates, moistening herbs are added.
  • If the pulse is very weak, Qi support is increased.
  • Where heat remains after a febrile illness, gentle cooling is added.

Timing

Taken in two or three divided doses through the day.

Duration

Three to seven days for acute depletion after heat or fever, and two to four weeks for chronic Qi and Yin deficiency.

Diet while taking it

Warm fluids in small sips; avoid alcohol and excessive sweating from heat or exercise while recovering.

Safety

Contraindications

Avoid while an external pathogen is unresolved: with fever, chills or an active infection, the astringent quality can trap it. Avoid in Dampness or Phlegm with a greasy coat.

Interactions

Ren Shen may affect blood sugar and anticoagulant therapy, and can interact with stimulants. Wu Wei Zi may affect liver enzymes and drug metabolism.

Pregnancy

Generally considered safe in pregnancy under professional guidance, as none of the three herbs is classified as contraindicated, though Ren Shen is strong.

Breastfeeding

Considered acceptable under professional guidance.

Children

Used in children with reduced dose for depletion after illness.

Before you use it

Recorded from the classical record and rewritten in this project's own words. Educational only: not a prescription, and severe depletion or collapse needs urgent medical care.

General safety references

General references for herbal hepatotoxicity and herb-drug interactions; they are not specific to this formula.

Selected PubMed records

Traditional use

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.

Origin and history

Yi Xue Qi Yuan (医学启源, The Source of Medical Learning) by Zhang Yuansu, Jin dynasty, 12th century.

Zhang Yuansu recorded the formula in the 12th century for deficiency of original Qi in the Lungs. Its later name, generate the pulse, shows how it came to be understood: it is the formula for the exhausted patient whose pulse is weak and who continues to sweat, and it is still used in that setting after fever, heat exposure or prolonged strain.

Classical record

补肺中元气不足。

It supplements the deficiency of original Qi in the Lungs.

Yi Xue Qi Yuan (医学启源, The Source of Medical Learning), Zhang Yuansu, Jin 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

What does the name mean?

Generate the pulse. It restores the Qi and fluids that give the pulse its strength and fullness.

When is it used after illness?

Once the acute fever has settled but the person is left exhausted, sweating, dry and breathless. It is not used while an infection is still active.

Can it be taken long term?

Short courses are typical. Longer use is guided by a practitioner for chronic Qi and Yin deficiency.

Is it safe with other medicines?

Ren Shen can affect blood sugar and blood clotting, so medical advice is needed in diabetes or on anticoagulants.