Natural Herb Library

Alum (Ming Fan)

Chinese
明矾
Pinyin
Ming Fan
Latin
Alumen
Scientific specimen plate of Alum (Ming Fan), Alumen, showing refined clear crystals, market lumps, calcined alum, powder, fracture surfaces, and diagnostic material details.
Botanical plate by Kodi . View print →

Known in TCM as Ming Fan (明矾), this sour and astringent, cold herb enters the Lung, Spleen, Large Intestine, and Liver. Traditionally, it dries Dampness and stops discharge, most often applied for dysentery, eczema, and uterine bleeding. Modern research has identified Potassium aluminum sulfate dodecahydrate among its active constituents.

Part used: Alum

TCM Properties

Taste
sour, astringent
Temperature
cold
Channels
Lung, Spleen, Large Intestine, Liver

Traditional Use

Primary Actions

  • Dries Dampness and stops discharge … excessive leucorrhea, diarrhea, dysentery, and sweating; astringent action through Al³⁺ ion binding to mucosal proteins; functionally identical to Bai Fan (herb #96) … same compound, same indications
  • Resolves toxicity and kills parasites … external use for tinea, scabies, trichomonas vaginitis, and infected skin ulcers; topical antiseptic and antifungal
  • Stops bleeding … haemostatic for haemoptysis, haematuria, and uterine bleeding from Heat patterns; astringent-cold action contracts bleeding surfaces
  • Transforms Phlegm and opens orifices … combined with Zhu Dan for Phlegm-type epilepsy; classical two-herb formula Bai Fan San shared between both names

Secondary Actions

  • Topical astringent for haemorrhoids … Ming Fan solution or Ku Fan (calcined form) powder applied to haemorrhoid tissue; contracts and desiccates prolapsed tissue
  • Gargle solution for throat and mouth … dilute Ming Fan solution used as astringent gargle for aphthous ulcers and pharyngitis; antiseptic and anti-inflammatory on mucous membranes

Classic Formulas

  • Bai Fan San (白矾散) … Ming Fan combined with Zhu Dan (pig bile) for Phlegm-type epilepsy; Ming Fan is the common commercial market name used interchangeably with Bai Fan in pharmacy dispensing
  • Ming Fan external wash … 3–5% Ming Fan solution used as topical soak or compress for tinea pedis, weeping eczema, and haemorrhoids; Ming Fan is the preferred name for topical preparations in contemporary Chinese pharmacy

Classical References

  • SYNONYM NOTE: Ming Fan (明矾, 'bright/clear alum') is the standard commercial market name for potassium aluminum sulfate KAl(SO₄)₂·12H₂O in modern Chinese pharmacy and food industry … synonymous with Bai Fan (白矾, 'white alum', herb #96); both names refer to the same mineral drug Alumen; the XLSX source filed both as separate entries reflecting two commonly used names; in clinical dispensing they are interchangeable; Ming Fan is the name typically used on commercial packaging and in food applications (where alum was historically used as a baking leavener and food firming agent), while Bai Fan is more common in TCM materia medica texts
  • Ben Cao Hui Yan (Ni Zhumo, 1624 CE): notes Ming Fan (明矾) as equivalent to Bai Fan in action … 'the name Ming (bright/clear) refers to the transparent crystals; the two names refer to the same stone with identical medicinal properties'

Modern Research

Active Compounds

  • Potassium aluminum sulfate dodecahydrate … KAl(SO₄)₂·12H₂O; identical to Bai Fan (herb #96)
  • Aluminum ion (Al³⁺) … astringent, antiseptic, protein-precipitating
  • Sulfate ion … desiccant, antibacterial

Studied Effects

  • Antimicrobial: identical to Bai Fan (herb #96); alum solutions inhibit dermatophytes, Candida, and common skin bacteria; mechanism: protein precipitation and pH reduction at treatment site
  • Astringent and haemostatic: Al³⁺ ions cross-link mucosal proteins causing vasoconstriction and reduced secretion; the mechanism is identical to Bai Fan and validated across multiple in vitro and clinical studies on alum preparations

Safety & Interactions

Contraindications

  • Spleen-Stomach Deficiency Cold … cold, astringent nature; avoid internal use in deficiency Cold patterns
  • Yin Deficiency without Damp accumulation … astringency inappropriate without pathological Dampness

Cautions

  • Standard internal dose: 0.6–1.5 g in pill or powder; short-term use only; avoid prolonged internal use due to aluminum accumulation risk
  • Ming Fan is also used as a food additive (E521 potassium alum) in fried dough and baked goods in China … dietary aluminum exposure from these sources adds to any therapeutic intake; consider cumulative exposure
  • External use is well-tolerated at 2–5% solutions; Ku Fan (calcined alum) powder used topically for skin conditions without significant systemic absorption
  • See Bai Fan (herb #96) for complete safety profile … identical substance

Conditions

Frequently Asked Questions

What is Alum (Ming Fan) used for?

Alum (Ming Fan) is traditionally used to Dries Dampness and stops discharge … excessive leucorrhea, diarrhea, dysentery, and sweating; astringent action through Al³⁺ ion binding to mucosal proteins; functionally identical to Bai Fan (herb #96) … same compound, same indications, Resolves toxicity and kills parasites … external use for tinea, scabies, trichomonas vaginitis, and infected skin ulcers; topical antiseptic and antifungal, Stops bleeding … haemostatic for haemoptysis, haematuria, and uterine bleeding from Heat patterns; astringent-cold action contracts bleeding surfaces, Transforms Phlegm and opens orifices … combined with Zhu Dan for Phlegm-type epilepsy; classical two-herb formula Bai Fan San shared between both names. Research has investigated its effects on: Antimicrobial: identical to Bai Fan (herb #96); alum solutions inhibit dermatophytes, Candida, and common skin bacteria; mechanism: protein precipitation and pH reduction at treatment site; Astringent and haemostatic: Al³⁺ ions cross-link mucosal proteins causing vasoconstriction and reduced secretion; the mechanism is identical to Bai Fan and validated across multiple in vitro and clinical studies on alum preparations.

Is Alum (Ming Fan) safe during pregnancy?

The safety of Alum (Ming Fan) during pregnancy has not been established. Consult a qualified healthcare provider before use.

What are the contraindications for Alum (Ming Fan)?

Alum (Ming Fan) should not be used in: Spleen-Stomach Deficiency Cold … cold, astringent nature; avoid internal use in deficiency Cold patterns; Yin Deficiency without Damp accumulation … astringency inappropriate without pathological Dampness. Consult a qualified practitioner before use.