Traditionally used for
- Skin
Cautions & contraindications
- Pregnancy
- Kidney conditions
- Toxic — professional use only
☯ TCM Properties
Relieves Itching and Treats Sores; Warms the Ming Men Fire; Purges Cold Accumulation
Traditional Chinese Uses
Liu Huang (硫黄), Sulfur, is native sulfur, purified before use. It is sour and hot and toxic, entering the Kidney and Large Intestine channels. Applied externally it kills parasites, relieves itching and treats sores; taken internally, in its processed form only, it warms the Kidneys and supplements the Fire of the Gate of Vitality (Ming Men) and frees Cold accumulation.
Externally it is the classical specific for scabies, and is used for tinea, chronic eczema and itching skin lesions, ground and mixed into an ointment or a wash. Internally — as processed sulfur, 1.5 to 3 g in pills or powder, never in decoction — it is given for Kidney Yang exhaustion with aversion to cold and cold limbs, for wheezing from Kidney failure to grasp the Qi, and notably for the constipation of the cold, deficient elderly, where it warms rather than purges.
Raw sulfur is for external use only. It is hot and drying and is contraindicated in Yin deficiency with Heat signs and in pregnancy; internal use should be short and supervised, since excess produces gastrointestinal irritation and, absorbed as sulfide, systemic toxicity.
Relationships
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Botanical Description
Liu Huang is not a plant but native sulfur, elemental sulfur (S8) in its mineral form. It occurs as soft, brittle, lemon-yellow to greenish-yellow masses, crusts, or well-formed orthorhombic crystals with resinous to greasy luster, hardness 1.5-2.5 on the Mohs scale, and a low specific gravity around 2.0-2.1. Native sulfur forms around volcanic vents and fumaroles, in hot-spring deposits, and through the bacterial reduction of sulfate minerals in sedimentary settings such as evaporite cap rocks. Refined material melts easily, burns with a blue flame, and emits a characteristic pungent sulfur-dioxide odor. In TCM, processed Liu Huang has been used internally for cold deficiency and topically for skin parasites and scabies (Wikipedia; NCBI).
Active Constituents
Elemental sulfur (S8, alpha-orthorhombic native sulfur)
Native element mineral; cyclo-octasulfur ringsConcentration: The Chinese Pharmacopoeia monograph requires not less than 98.5 percent S. Sulfur is not a compound with an active fraction - the assay is the drug.
Topically, elemental sulfur is reduced at the skin surface to pentathionic acid and sulfides, which is the basis of its keratolytic, antifungal and acaricidal action; 10 percent sulfur ointment remains a first-line scabicide in children, infants and pregnancy in several national guidelines. Internally it is not absorbed as sulfur: gut flora reduce it to sulfides and hydrogen sulfide, which irritate the intestinal mucosa and drive peristalsis. That reduction is both the laxative mechanism and the toxicity.
Hydrogen sulfide and inorganic sulfides (gut metabolites)
Gaseous and ionic sulfur metabolites generated in the colonConcentration: Not measurable as a drug content; the yield depends on gut flora, transit time and the dietary and pharmaceutical sulfate load reaching the colon
This is the species that actually acts and actually poisons when sulfur is taken internally. Hydrogen sulfide is a mitochondrial poison at the same site as cyanide - it inhibits cytochrome c oxidase - and at high concentration it paralyses central nervous tissue directly. In the colon it is normally detoxified by mucosal thiol methyltransferase and rhodanese, but the capacity is finite; colonic sulfide is implicated in the pathogenesis of ulcerative colitis, and butyrate oxidation in colonocytes is inhibited by sulfide. Reports of the 'warming and yang-supplementing' internal action of Liu Huang describe exactly this: sulfur converted to sulfide and hydrogen sulfide, irritating the gut mucosa into motion.
Arsenic (as realgar and orpiment inclusions in the native ore)
Metalloid contaminant, present as arsenic sulfide minerals intergrown with native sulfurConcentration: Controlled by an arsenic limit test in the Chinese Pharmacopoeia monograph rather than left unlimited, which is itself the clearest statement that arsenic is the expected contaminant of this drug. Published work on the tofu-boiling process reports finished product above 98 percent sulfur with arsenic at or below 1 microgram/mL, meeting the pharmacopoeial arsenic salt limit.
Arsenic is the reason Liu Huang is processed before internal use at all. Native sulfur forms in the same volcanic and sedimentary sulfide environments as realgar and orpiment, so untreated ore carries arsenic sulfides as intergrowths. Raw, unprocessed sulfur bought as a mineral or an agricultural chemical is not the internal drug and should never be swallowed.
Zhi Liu Huang (sulfur processed by boiling with tofu)
Pharmacopoeial processed form of the same elementConcentration: Prepared by boiling clean sulfur with tofu until the tofu turns blackish-green, then rinsing and shade-drying; 200 kg of tofu per 100 kg of sulfur
Only the processed drug is intended for internal use, at 1.5-3 g incorporated into pills or powders; raw sulfur is for external use. The tofu boil is a genuine detoxification step, not a ritual - the soy protein and its thiols bind and carry off arsenic, and the arsenic content of the finished article is what the monograph's limit test is checking. A practitioner reading a formula that calls for internal sulfur is reading a call for Zhi Liu Huang.
Sulfur dioxide (combustion product)
Gaseous oxide formed when the drug is burned rather than swallowed or appliedConcentration: Not a constituent of the drug as dispensed; relevant because burning sulfur is the standard method of fumigating other Chinese botanical drugs, leaving sulfite and sulfur dioxide residues in the fumigated material
Recorded here as a name and process hazard rather than a property of Liu Huang itself. Sulfur fumigation of botanical drugs alters their chemistry and leaves sulfur dioxide and sulfite residues that matter to sulfite-sensitive asthmatics; the residues belong to the fumigated herb, not to the sulfur monograph, and the two should not be conflated in a patient's exposure assessment.
Lead, cadmium and mercury (trace)
Trace heavy-metal contaminants of the native oreConcentration: Not verified. The monograph controls this drug by a sulfur assay of not less than 98.5 percent together with an arsenic limit test; no Pb, Cd or Hg limit for Liu Huang could be confirmed against the pharmacopoeial text. The general Chinese Pharmacopoeia values quoted for Chinese medicines - Pb 5, Cd 1, As 2, Hg 0.2 and Cu 20 mg/kg - are attached to designated herbal pieces, not to this mineral.
The absence of a limit is not evidence of absence. Sulfur ores from sulfide deposits sit alongside lead, zinc and mercury sulfides, and the monograph's silence on those elements means a batch is unbounded for them; only the arsenic is actively controlled.
⚠ Drug Interactions
Pu Xiao, Mang Xiao and Xuan Ming Fen (mirabilite, sodium sulfate decahydrate) - the classical Nineteen Antagonisms pairing
The prohibition 'sulfur fears Pu Xiao' is one of the nine couplets of the Nineteen Antagonisms, first set down in Liu Chun's Yi Jing Xiao Xue of 1388, and it has been transmitted as an absolute incompatibility ever since. A modern reading is coherent rather than merely traditional. Mirabilite is sodium sulfate decahydrate and delivers a large unabsorbed sulfate load to the colon, where sulfate-reducing bacteria convert it to hydrogen sulfide; Liu Huang delivers elemental sulfur to the same compartment, reduced by the same flora to the same product. Both drugs act by purgation, so the combination stacks a cathartic effect on top of a shared sulfide-generating pathway. The 2024 review of mirabilite notes explicitly that the sulfur ions of its metabolites can be toxic. Experimental study of the Nineteen Antagonisms is still preliminary and no controlled data exist for this specific pair, which is why this is rated possible rather than established.
Clinical note: Do not combine Liu Huang with mirabilite in any of its names - Pu Xiao, Mang Xiao, Xuan Ming Fen - and check proprietary purgative and throat formulas, where mirabilite is common and often unremarked. Note also a real nomenclature hazard: some commentators read the Pu Xiao of this couplet as Xiao Shi, saltpetre, rather than mirabilite. Sulfur, saltpetre and charcoal are the three components of black powder, so the two readings carry different warnings and a dispensary should keep sulfur physically separate from both salts.
Sulfate and sulfur-donating agents: magnesium sulfate, sodium sulfate and sulfate bowel preparations, methylsulfonylmethane, N-acetylcysteine, high-sulfate mineral waters
Colonic hydrogen sulfide output rises with the substrate available to sulfate-reducing bacteria, and human dietary intervention studies show measurable differences in faecal hydrogen sulfide production with diet composition. Adding an elemental sulfur source to a heavy sulfate load is the same reasoning that underlies the classical mirabilite prohibition, extended to modern agents that were not available when the prohibition was written.
Clinical note: Avoid stacking internal Liu Huang with sulfate osmotic laxatives, bowel preparations or high-dose sulfur supplements. If a bowel preparation is scheduled, stop internal sulfur beforehand.
Ulcerative colitis and other inflammatory bowel disease
Sulfide impairs butyrate oxidation by colonocytes and has been proposed as a pathogenic factor in ulcerative colitis, with sulfate-reducing bacteria and faecal sulfide raised in active disease; reducing sulfide exposure is an explicit therapeutic strategy in that literature. Giving elemental sulfur by mouth is a deliberate increase in colonic sulfide, which is the opposite of what the disease requires.
Clinical note: Do not use Liu Huang internally in ulcerative colitis, Crohn's disease or pouchitis. Topical use is unaffected.
Xiong Huang (realgar), Pi Shuang (arsenic trioxide) and other arsenical drugs
Native sulfur carries arsenic sulfides as ore intergrowths - the reason the monograph carries an arsenic limit test and the reason the tofu process exists. Where sulfur is combined with realgar (arsenic disulfide) or with any arsenical, the residual arsenic in the sulfur adds to a load that is already the dose-limiting toxicity of the other drug. Raw rather than tofu-processed sulfur makes this materially worse.
Clinical note: Never combine internal sulfur with arsenical minerals. If sulfur must be used internally at all, insist on Zhi Liu Huang from a supplier who can show the arsenic limit test.
Topical retinoids, benzoyl peroxide, salicylic acid and other keratolytics
Sulfur is itself keratolytic and mildly irritant, which is why the classical vehicle is an ointment rather than an alcoholic base. Stacking it with other keratolytics on the same skin compounds barrier disruption, and broken skin then increases whatever systemic absorption is possible.
Clinical note: Do not layer sulfur ointment with retinoids or benzoyl peroxide on the same area on the same day; alternate, and reduce concentration or frequency if the skin becomes tender.
Sulfur-fumigated herbs in the same prescription (sulfur dioxide and sulfite residues)
Sulfur fumigation is a widespread post-harvest treatment of Chinese botanical drugs and leaves sulfur dioxide and sulfite residues, alongside documented changes to the fumigated drug's chemistry. This is a different substance and a different route from the sulfur monograph, but a prescription can carry both, and a sulfite-sensitive patient reacts to the residue rather than to the elemental sulfur.
Clinical note: In an asthmatic or a known sulfite-sensitive patient, source unfumigated crude drugs for the rest of the prescription rather than assuming the reaction came from the sulfur.
Pregnancy and internal use in children
There is no adequate human safety data for internal sulfur in pregnancy or childhood, and the drug's internal action depends on generating a mitochondrial poison in the gut of a patient with an arsenic-contaminated mineral. Classical practice already restricts internal use to yang-deficient cold patterns and cautions against it in pregnancy. Topical sulfur is a different matter: it is the scabicide of choice for infants and in pregnancy in several guidelines precisely because it is poorly absorbed through intact skin.
Clinical note: Separate the two routes explicitly when advising a patient. Topical sulfur in pregnancy and infancy is well accepted; internal sulfur in either is not, and the same word covers both.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| powder | 1.5–3 g | — | — | — | ChP 2025 (yaobw.cn mirror; cross-validated against db.ouryao.com). 内服1.5～3g，炮制后入丸散服 — internal use only as the processed drug, in pills or powder, never in decoction. 孕妇慎用；不宜与芒硝、玄明粉同用 — caution in pregnancy; not combined with Mang Xiao or Xuan Ming Fen. Replaces a generic filler value generated from tcm_category, which had been cleared to blank. |
| topical | Appropriate amount | — | — | — | ChP 2025 (yaobw.cn mirror; cross-validated against db.ouryao.com). 外用适量，研末油调涂敷患处 — powdered and mixed with oil; the classical specific for scabies. Raw sulfur is for external use only. |
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
Warming Kidney yang combined with directing turbid qi downward, the pair moves the bowels in constipation from yang deficiency with interior cold.
Cold-type constipation in the elderly. Internal use is only of processed (purified) sulfur in pill form, short-term; contraindicated in pregnancy and yin deficiency with heat.
Core pair of a classical formula — Ban Liu Wan, Tai Ping Hui Min He Ji Ju Fang
Heavy descending of lead combined with the hot life-gate-warming action of sulphur, which warms Kidney yang and draws rebellious qi down to grasp qi.
Upper excess and lower deficiency with wheezing from Kidney failing to grasp qi. Both are toxic (lead and sulphur); short-term use only, contraindicated in pregnancy.
Core pair of a classical formula — Hei Xi Dan, Tai Ping Hui Min He Ji Ju Fang
Evidence Tier
Moderate evidence · 4 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
2
0 verified · 2 unverified
Other clinical trial
0
Observational / case report
1
0 verified · 1 unverified
In vitro / animal
0
Other / unclassified
1
1 verified · 0 unverified
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
The efficacy of oral ivermectin vs. sulfur 10% ointment for the treatment of scabies
420 patients with scabies randomised to a single 200 microgram/kg oral dose of ivermectin or to 10 percent sulfur ointment applied on three successive days, with retreatment for failures at two weeks. Cure was 61.9 percent for ivermectin and 45.2 percent for sulfur at two weeks, rising to 78.5 percent and 59.5 percent respectively at four weeks after retreatment; the two were equivalent at two weeks and ivermectin superior at four. This is the largest randomised comparison located for topical sulfur, and it shows the drug is genuinely active but less so than a modern comparator.
Comparison of sulfur ointment and permethrin treatments in scabies
Single-centre retrospective comparison in Turkey of 10 percent sulfur ointment against 5 percent permethrin cream, assessed at two weeks, in which sulfur was significantly more effective (p less than 0.001). The authors read the unexpectedly poor permethrin result as a signal of emerging permethrin resistance rather than as evidence of sulfur superiority, and the retrospective, unblinded design supports that caution; it is included as a counterweight to the randomised comparisons rather than as a stronger finding than they are.
Comparative Trial of Oral Ivermectin versus Sulfur 8% Ointment for the Treatment of Scabies
Randomised comparison of oral ivermectin with 8 percent sulfur ointment for scabies, published as a letter. It belongs to the same small group of trials from the same investigators as the 2015 ivermectin comparison and should be read alongside it rather than as independent confirmation.
A comparative study between 10 per cent sulfur ointment and 0.3 per cent gamma benzene hexachloride gel in the treatment of scabies in children
Randomised, investigator-blind comparison of 10 percent sulfur ointment with 0.3 percent lindane gel in children with scabies, conducted because the risk-benefit of scabicides in infants and children is the central question in this indication. It is the reason sulfur retains a place in paediatric and pregnancy scabies guidance: not because it outperforms modern agents, but because it is the option with the least systemic hazard on intact skin.
⚠ Safety & Contraindications
- Pregnancy
- Kidney conditions
- Toxic — professional use only
Contraindications
Contraindicated in pregnancy and in yin deficiency with heat.
Safety Warnings
- Chiefly external. Internal use is small-dose and short-term.
- Not to be taken with Mang Xiao under the classical antagonisms.
⚠ Rule-Based Cautions
These entries come from the deterministic rule tables that gate Verscienta's formula tools — classical pair prohibitions, pregnancy and lactation contraindications, and dose ceilings.
Incompatibilities (十八反 / 十九畏)
- 十九畏: Liu Huang × Po Xiao — avoid combining with Mang Xiao / Po Xiao / Mirabilite
⚠ Toxicity Information
Diarrhoea and abdominal pain; in overdose, hydrogen-sulfide toxicity with headache, dizziness and central nervous depression.
Historical Texts
Shen Nong Ben Cao Jing (Divine Husbandman's Classic of Materia Medica), entry Shi Liu Huang
Han, compiled by around 200 CETai Ping Hui Min He Ji Ju Fang (Formulary of the Bureau of Taiping People's Welfare Pharmacies) - Ban Liu Wan
Northern Song, official formulary issued from the late 11th century and expanded through the 12thYi Jing Xiao Xue (Elementary Learning of the Medical Classics), Liu Chun - the Nineteen Antagonisms
Ming, 1388Ben Cao Gang Mu (Compendium of Materia Medica), Li Shizhen
Ming, 1596References
- Salavastru CM; Chosidow O; Boffa MJ; Janier M; Tiplica GS. European guideline for the management of scabies . Journal of the European Academy of Dermatology and Venereology (2017) [DOI]
- Guidotti TL. Hydrogen sulfide intoxication . Handbook of Clinical Neurology (2015) [DOI]
- Singh SB; Lin HC. Hydrogen Sulfide in Physiology and Diseases of the Digestive Tract . Microorganisms (2015) [DOI]
- Roediger WEW; Moore J; Babidge W. Colonic Sulfide in Pathogenesis and Treatment of Ulcerative Colitis . Digestive Diseases and Sciences (1997) [DOI]
- Tao L; Fu J; Wang F; Song Y; Li Y; Zhang J; Wang Z. The application of mirabilite in traditional Chinese medicine and its chemical constituents, processing methods, pharmacology, toxicology and clinical research . Frontiers in Pharmacology (2024) [DOI]
- Xu W; Jin H; Wang Y; Wei F; Liu J. Sulfur fumigation of botanical drugs: impact on chemical composition and pharmacological properties, and advances in detection technologies . Frontiers in Pharmacology (2025) [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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