Traditionally used for
- Cough & breathing
- Digestion
- Bowel health
- Menstrual & women's health
- Skin
- Liver & jaundice
Cautions & contraindications
- Young children
- Kidney conditions
- Toxic — professional use only
☯ TCM Properties
Kills Parasites and Resolves Toxicity; Dries Dampness and Stops Itching; Stops Bleeding; Stops Diarrhea; Dispels Wind-Phlegm; Absorbs Dampness and Heals Sores
Traditional Chinese Uses
Ming Fan (alum, potassium aluminum sulfate) is a cold, astringent mineral substance used in Chinese medicine primarily as an external treatment for skin conditions, oral sores, hemorrhoids, and vaginal infections. Internally, in small doses, it clears Phlegm-Heat from the Lungs and Stomach, treats jaundice from Damp-Heat, and stops bleeding from Blood Heat. Its powerful drying and astringent properties make it effective for conditions involving excessive moisture, discharge, or weeping of body surfaces.
Relationships
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Botanical Description
Ming Fan is potassium aluminum sulfate dodecahydrate, KAl(SO4)2·12H2O, commonly called potash alum or simply alum. It occurs as a colorless to white, transparent, octahedral crystalline mineral salt, obtained either by purification of the natural mineral alunite or by recrystallization from solutions of aluminum sulfate and potassium sulfate. The crystals are odorless, with a strongly astringent puckering taste, soluble in water giving an acidic solution. For pharmaceutical use the crystals are crushed, and a calcined form (Ku Fan, 'burnt alum') is prepared by gentle heating until the water of crystallization is driven off, leaving a porous white powder of anhydrous aluminum-potassium sulfate. In traditional Chinese medicine, Ming Fan is sour, astringent, and cold with slight toxicity, entering the lung, liver, spleen, and large intestine channels; it dries damp, kills parasites, stops bleeding and chronic diarrhea, transforms phlegm, and resolves toxicity, used externally for skin lesions, scabies, and eczema, and internally for chronic diarrhea, prolapse, hemoptysis, and epilepsy from phlegm.
Active Constituents
Potassium aluminium sulfate dodecahydrate (potash alum)
Hydrated double sulfate salt, refined from the sulfate mineral aluniteConcentration: The Chinese Pharmacopoeia monograph for Bai Fan requires not less than 99.0 percent KAl(SO4)2·12H2O. The pure dodecahydrate is 5.7 percent aluminium by mass, so the pharmacopoeial internal dose of 0.6-1.5 g delivers roughly 34-85 mg elemental aluminium per dose.
The whole drug. On contact with skin, mucosa or a wound bed it hydrolyses to give an acidic, protein-precipitating solution; the coagulation of surface protein is the entire mechanism behind the astringent, haemostatic, drying and antipruritic actions, and it is also why concentrated solutions are irritant to inflamed tissue.
Aluminium ion (Al3+)
Trivalent metal cation released on dissociationConcentration: 5.7 percent of the dodecahydrate by mass. For context, EFSA's tolerable weekly intake for aluminium from all dietary sources is 1 mg Al/kg body weight per week - about 60 mg a week for a 60 kg adult - so a single 1.5 g internal dose of Ming Fan exceeds a whole week's tolerable intake. The Food Safety Commission of Japan set a higher TWI of 2.1 mg Al/kg bw/week from the same rat developmental NOAEL of 30 mg Al/kg bw/day with a 100-fold factor; even against that figure the dose is close to a week's allowance.
Aluminium is the toxicologically governing species and the reason chronic or repeated internal use is the wrong way to use this drug. Only a fraction of a percent of ingested aluminium is normally absorbed, but the tolerable intakes are set on total dietary aluminium and already assume that low bioavailability; absorption rises steeply with citrate. Aluminium is cleared almost entirely by the kidney, accumulates in bone and brain when clearance fails, and produces the recognised triad of encephalopathy, osteomalacia and microcytic anaemia.
Sulfate ion
Inorganic anionConcentration: Two sulfate per formula unit, about 40 percent of the anhydrous salt by mass
Toxicologically unremarkable at these doses - the Food Safety Commission of Japan found no safety concern for the sulfate, potassium or ammonium ions of alum food additives and confined its assessment to aluminium. In quantity, sulfate contributes an osmotic and mildly cathartic effect in the gut, which is one reason large internal doses provoke vomiting and diarrhoea.
Ku Fan (calcined alum, anhydrous KAl(SO4)2)
Dehydrated form of the same double sulfate, prepared by dry calcination until crisp and friableConcentration: Loss of the twelve waters roughly halves the formula mass, so calcined alum is about 10.4 percent aluminium by mass - close to twice the aluminium density of raw Ming Fan for the same weight of powder
The Chinese Pharmacopoeia treats Ku Fan as a separate article, indicated for damp eczema, ear discharge, vaginal discharge, nosebleed, gum bleeding and nasal polyps - drier, more strongly absorbent and used almost entirely topically. The doubling of aluminium per gram is the point a practitioner must hold on to: a gram-for-gram substitution of calcined for raw alum roughly doubles the aluminium exposure.
Iron, lead, arsenic and other residues of the alunite ore
Trace metal and metalloid contaminants surviving refiningConcentration: Not verified. The Bai Fan monograph is controlled by a purity assay of not less than 99.0 percent rather than by published element-specific limits, and no As, Pb, Cd or Hg limit for this drug could be confirmed against the pharmacopoeial text. The general Chinese Pharmacopoeia figures often quoted for Chinese medicines - Pb 5, Cd 1, As 2, Hg 0.2 and Cu 20 mg/kg - are attached to designated herbal pieces and are not applied to refined mineral salts.
Refined alum is a recrystallised salt and is not a major heavy-metal carrier, but the negative should be stated as a negative: a purity assay bounds the impurities collectively without identifying any of them, and technical or industrial-grade alum, which is manufactured for water treatment and tanning rather than for medicine, carries no elemental guarantee at all.
⚠ Drug Interactions
Citrate in any form: calcium citrate, potassium citrate, citrus juice, effervescent and dispersible tablet formulations, citrated blood products
Citrate forms a soluble, absorbable aluminium citrate complex and dismantles the low gastrointestinal bioavailability on which every tolerable intake for aluminium is premised. Controlled human studies show calcium citrate markedly enhances aluminium absorption from aluminium hydroxide, orange juice enhances aluminium absorption from antacids, and 26Al tracer work in volunteers puts aluminium citrate well above aluminium hydroxide for bioavailability. Acute aluminium toxicity has been reported in patients taking oral citrate together with an aluminium-containing antacid.
Clinical note: Do not give Ming Fan internally with citrus juice, citrate salts, effervescent preparations or calcium citrate supplements, and separate them if internal use is unavoidable. This is the single most important interaction for this drug and it is easy to trigger accidentally.
Renal impairment, dialysis, and intravesical or large-area mucosal alum use in renal failure
Aluminium is excreted almost exclusively by the kidney, so falling glomerular filtration converts a tolerable intake into an accumulating body burden. The best-documented modern alum poisonings are iatrogenic and use exactly this drug: continuous intravesical alum irrigation for haemorrhagic cystitis has produced acute aluminium encephalopathy in patients with renal failure, reported by Perazella and Brown in 1993 and reviewed with a further case by Phelps and colleagues in 1999, and one such episode required combined intravenous deferoxamine and haemodialysis to reverse. Absorption across an inflamed, denuded urothelium or an ulcerated mucosa is far greater than across intact epithelium.
Clinical note: Absolute avoidance of internal Ming Fan in any degree of renal impairment, and no application to large denuded surfaces, bladder, rectum or ulcerated mucosa in such patients. Aluminium encephalopathy is treatable with deferoxamine plus dialysis but is easily mistaken for uraemic encephalopathy.
Aluminium-containing antacids, sucralfate, aluminium hydroxide phosphate binders, buffered aspirin, aluminium-adjuvanted preparations
Aluminium load is additive across sources and the health-based guidance value is weekly precisely because the metal accumulates. A patient on aluminium hydroxide phosphate binders or regular antacids may already be at or over the TWI before Ming Fan is added, and the two sources share the same absorption-enhancing interaction with citrate.
Clinical note: Ask specifically about antacids, sucralfate and phosphate binders. Where one is in use, restrict Ming Fan to external application and avoid internal dosing entirely.
Tetracyclines, fluoroquinolones, levothyroxine, oral iron, bisphosphonates and other polyvalent-cation-sensitive drugs
Al3+ is a hard trivalent cation that chelates the same drug functional groups as the aluminium in antacids, and it is delivered in a soluble, immediately available form. The chelation interaction is established for aluminium antacids and the mechanism transfers directly; it has not been studied for Ming Fan itself, which is why this is rated probable rather than established.
Clinical note: Separate internal Ming Fan from these drugs by at least two hours before and four to six hours after. For levothyroxine and antibiotics with narrow effective windows, prefer to avoid concurrent internal use.
Large internal doses, emetic use, and internal use in children
The astringency that makes the drug useful is protein coagulation, and at gram doses on gastric and intestinal mucosa that is chemical injury: vomiting, abdominal pain, haemorrhagic gastroenteritis and, in the reported lay-remedy poisonings, hepatic and respiratory failure with no specific antidote. The historical emetic use of alum operated by this mechanism rather than through any central action. A 20-month dietary study of aluminium potassium sulfate in mice found no tumorigenic or other toxic effect at up to 10 percent of the diet, so the hazard here is acute local injury and aluminium accumulation, not carcinogenicity.
Clinical note: Keep internal doses within the pharmacopoeial 0.6-1.5 g, keep courses short, and do not use the drug internally in children. Alum is one of the traditional remedies most often implicated in lay overdosing precisely because it is cheap and freely sold as a food and household chemical.
Peng Sha (borax) in traditional paediatric diarrhoea practice
Alum and sodium tetraborate have been used together as traditional antidiarrhoeal salts in children, and were given together in the only located clinical study of either, a 26-child preliminary trial in Burma reported by Aung and U in 1986 which found reduced oral rehydration requirements and no detected side effects. That study is far too small to detect anything, and it combines an aluminium load with a boron load in infants and young children, the group in which borate poisoning has historically been fatal.
Clinical note: Do not reproduce this combination. Oral rehydration solution is the established treatment for acute childhood diarrhoea and there is no case for adding either mineral to it.
Aluminium in food: alum as a firming agent, pickling salt and baking acidulant
Aluminium potassium sulfate is a permitted food additive in several jurisdictions - it is E 522 in the EU and is used in Japan as a firming and colour-fixing agent, which is why both EFSA and the Food Safety Commission of Japan have formally assessed it. Dietary exposure assessments of aluminium-containing additives show that some population groups, children in particular, already approach or exceed the tolerable weekly intake from food alone.
Clinical note: Where a patient's diet is high in alum-treated foods - pickles, certain fried dough and steamed products, alum-set bean starch noodles - treat the internal dose as adding to an already-loaded baseline and prefer external use.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction, or powder/pills | 0.6–1.5 g | Daily | — | — | 中国药典 2020 monograph 【白矾】【用法与用量】0.6～1.5g。外用适量，研末敷或化水洗患处。 【性味与归经】酸、涩，寒。归肺、脾、肝、大肠经。 — Matched by hand: Potassium alum KAl(SO4)2·12H2O; 明矾 and ChP 白矾 are the same substance. Chinese Pharmacopoeia 2020, quoted verbatim. |
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
Resolving toxicity and killing parasites combined with drying dampness and relieving itching, the pair treats toxic sores and damp, itching skin lesions when applied topically.
External application only. Xiong Huang contains arsenic; do not apply to large areas or for prolonged periods, and do not heat it.
Core pair of a classical formula — Er Wei Ba Du San, Yi Zong Jin Jian (Wu Qian)
The combination dissolves thick phlegm and clears the Heart while releasing constraint, opening orifices blocked by phlegm.
Phlegm obstructing the Heart orifices in mania and epilepsy.
Core pair of a classical formula — Bai Jin Wan (classical formula; attributions of the source text differ)
Thins and expels thick phlegm by inducing vomiting, clearing phlegm that obstructs the throat and orifices.
Emergency emetic for wind-stroke with phlegm rattling; strong and only for robust excess patterns.
Core pair of a classical formula — Xi Xian San, Sheng Ji Zong Lu
Evidence Tier
Moderate evidence · 5 studiesRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
0
Randomized controlled trial
0
Other clinical trial
2
2 verified · 0 unverified
Observational / case report
2
2 verified · 0 unverified
In vitro / animal
1
0 verified · 1 unverified
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Acute Aluminum Toxicity and Alum Bladder Irrigation in Patients With Renal Failure
Reports a patient with renal failure after bone marrow transplantation who developed acute encephalopathy from apparent aluminium intoxication following intravesical alum instillation for haemorrhagic cystitis, and identifies two further published cases of acute aluminium intoxication from alum in renal-failure patients who had received multiagent chemotherapy. The authors reject the prior claim that intravesical alum is safe in renal failure and recommend alternative therapies. This is direct human evidence that mucosal alum - the same salt as Ming Fan - can produce systemic aluminium toxicity when the surface is inflamed and renal clearance is impaired.
Encephalopathy after Bladder Irrigation with Alum: Case Report and Literature Review
A further case of encephalopathy following alum bladder irrigation, set against a review of the published cases. Together with Perazella and Brown it establishes intravesical and mucosal alum as a recognised route to acute aluminium neurotoxicity rather than an isolated curiosity, and it is the reason the drug should not be applied to large denuded mucosal surfaces in patients who cannot clear aluminium.
Calcium Citrate Markedly Enhances Aluminum Absorption From Aluminum Hydroxide
Controlled human study showing that calcium citrate produces a marked increase in aluminium absorption from co-administered aluminium hydroxide. It is the clearest demonstration of the citrate effect in people and is the basis for treating any citrate source as a major interaction with an ingested aluminium salt such as Ming Fan.
Chronic toxicity and tumorigenicity study of aluminum potassium sulfate in B6C3F1 mice
Twenty-month dietary study of aluminium potassium sulfate in B6C3F1 mice at 1.0, 2.5, 5.0 and 10.0 percent of the diet. Body weight gain fell at 10 percent, survival was not reduced in any treated group, and the incidence of hepatocellular carcinoma was if anything lower in treated males; the authors conclude that long-term administration does not exert tumorigenic or other toxic actions in this species. The honest reading is narrow: it argues against carcinogenicity for the exact salt in Ming Fan, and says nothing about acute mucosal injury or about aluminium accumulation in a patient who cannot excrete it.
The effect of sodium tetraborate and alum in the management of acute childhood diarrhoea
A small preliminary controlled observation in which alum and sodium tetraborate, both long-standing traditional remedies, were given to 26 children with acute diarrhoea; the authors report an appreciable reduction in oral rehydration fluid requirement and no side effects detected. It is recorded because it is the only located human trial of internal alum, and because its size, reporting and population make it evidence of practice rather than evidence of safety.
⚠ Safety & Contraindications
- Young children
- Kidney conditions
- Toxic — professional use only
Contraindications
Its use is prohibited in the weak or patients with weakness of the stomach, or without damp-heat and phlegm-fire.
Source: Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas. Academic Press/Elsevier, 2017, pp. 402–408.
Historical Texts
Shen Nong Ben Cao Jing (Divine Husbandman's Classic of Materia Medica), entry Fan Shi
Han, compiled by around 200 CEJin Gui Yao Lue (Essentials of the Golden Cabinet), Zhang Zhongjing - Xiao Shi Fan Shi San and Fan Shi Wan
Eastern Han, around 200 CEBen Cao Gang Mu (Compendium of Materia Medica), Li Shizhen
Ming, 1596References
- EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS); Younes M; Aggett P; Aguilar F; Crebelli R; Dusemund B; Filipic M; Frutos MJ; Galtier P; Gott D; Gundert-Remy U; Kuhnle GG. Re‐evaluation of aluminium sulphates (E 520–523) and sodium aluminium phosphate (E 541) as food additives . EFSA Journal (2018) [DOI]
- Food Safety Commission of Japan. Aluminium Ammonium Sulfate and Aluminium Potassium Sulfate (Food Additives) . Food Safety (2019) [DOI]
- Kirschbaum BB; Schoolwerth AC. Acute Aluminum Toxicity Associated with Oral Citrate and Aluminum-Containing Antacids . The American Journal of the Medical Sciences (1989) [DOI]
- Priest ND; Talbot RJ; Austin JG; Day JP; King SJ; Fifield K; Cresswell RG. The bioavailability of 26Al-labelled aluminium citrate and aluminium hydroxide in volunteers . BioMetals (1996) [DOI]
- Nakamura H; Rose PG; Blumer JL; Reed MD. Acute Encephalopathy Due to Aluminum Toxicity Successfully Treated by Combined Intravenous Deferoxamine and Hemodialysis . The Journal of Clinical Pharmacology (2000) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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