Traditionally used for
- Eye health
- Nose & throat
- Teeth & mouth
- Sleep
- Mood & calm
- Nerves & recovery
- Heart & circulation
- Skin
Cautions & contraindications
- Pregnancy
- Liver conditions
- Kidney conditions
- Toxic — professional use only
☯ TCM Properties
Anchors and Calms the Spirit; Clears Heart Fire; Resolves Toxicity; Brightens the Eyes
Traditional Chinese Uses
Zhu Sha (朱砂), Cinnabaris, is native cinnabar — mercuric sulfide, HgS — ground to an exceedingly fine powder by water levigation (水飞). It is sweet and slightly cold and toxic, entering the Heart channel. It anchors and calms the Spirit, clears Heart Fire, resolves toxicity and brightens the eyes.
Its weight is its action: it is the heavy, settling substance given for a Spirit that will not settle — palpitations with anxiety, restlessness, insomnia, vivid dreaming, fright and, classically, convulsions and mania. It is the sovereign herb of Zhu Sha An Shen Wan and appears in Heart-Fire formulas alongside Huang Lian and Sheng Di Huang. Externally it is applied to mouth and throat ulcers and to hot toxic sores.
Its toxicity governs its use, and the constraints are absolute. The Chinese Pharmacopoeia dose is 0.1 to 0.5 g per day, taken only as a levigated powder stirred into a prepared draught or made into pills — it is never decocted and never heated, because heat decomposes mercuric sulfide and liberates elemental mercury and mercury vapour. It must not be taken in large amounts, nor in small amounts over a long period; continuous use beyond about a week is outside pharmacopoeial guidance. It is contraindicated in pregnancy and in impaired liver or kidney function, and it must not be combined with iodide or bromide preparations, which convert it to soluble and far more absorbable mercury salts. Cumulative mercury poisoning presents with a metallic taste, salivation, gum inflammation, tremor, and renal and neurological damage.
Relationships
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Botanical Description
Zhu Sha is not a plant but the mineral cinnabar, mercury(II) sulfide (HgS), the principal natural ore of mercury. It occurs as bright vermilion to brick-red massive or crystalline aggregates with adamantine to dull luster, hardness 2-2.5 on the Mohs scale, and an exceptionally high specific gravity around 8.0-8.2. Cinnabar crystallizes in the trigonal system, typically forming rhombohedral or tabular crystals; in TCM materia medica it is sold as small, heavy, brilliant scarlet lumps or as a finely levigated powder. Deposits are associated with low-temperature hydrothermal veins and hot-spring activity. Because cinnabar is a heavy-metal mercury compound, modern toxicology and most contemporary clinical guidance discourage its internal use (Wikipedia; NCBI).
Active Constituents
Mercury(II) sulfide (alpha-HgS, cinnabar)
Metal sulfide mineral (trigonal alpha-HgS)Concentration: Medicinal cinnabar is reported to contain more than 96% HgS; stoichiometric HgS is 86.2% mercury by mass, so a 0.5 g dose carries roughly 0.4 g of elemental mercury
The whole drug is a mercury ore, not a plant extract. Alpha-HgS is one of the least soluble solids known and is poorly absorbed from the gut, which is the standard defence of its use, but low solubility is not zero solubility and the mercury burden delivered per dose is enormous compared with any environmental exposure standard.
Soluble mercury species (Hg3S2Cl2, HgS2(OH)-, HgS3(OH)-)
Soluble inorganic mercury complexesConcentration: Trace; dissolved under simulated gastric and intestinal conditions, and reduced but not eliminated by repeated water-grinding and washing (shui fei) of the raw mineral
These mercuric polysulfide and chloro-sulfide species are the fraction that actually crosses the gut wall, and they are what makes cinnabar a real rather than a nominal mercury exposure. They bind human serum albumin at two tight sites and were less cytotoxic to HK-2 renal cells than mercuric chloride in vitro, but they are the origin of the renal mercury accumulation seen after repeated dosing.
Free elemental mercury (Hg0)
Elemental metal, volatileConcentration: Trace in ground cinnabar; substantially increased when the mineral is heated
Heating cinnabar decomposes HgS and releases mercury vapour, which is efficiently absorbed across the lung and crosses the blood-brain barrier. This makes calcination, decoction over heat, and any pill-making or storage process involving heat a distinct and more dangerous exposure route than swallowing the cold powder. Cinnabar is therefore traditionally added to finished preparations rather than decocted.
Accessory sulfide minerals and heavy-metal contaminants
Mineral contaminant loadConcentration: Variable and deposit-dependent; not constrained by an assay of HgS content alone
Cinnabar ore occurs with pyrite, marcasite, stibnite, realgar and orpiment, so arsenic- and antimony-bearing sulfides are plausible accessory contaminants of unpurified material. A pharmacopoeial assay expressed as percent HgS says nothing about what the remaining few percent is, which is why source and purification history matter for this drug in a way they do not for a plant.
⚠ Drug Interactions
Potassium iodide and other iodide-containing preparations (iodide expectorants, iodinated contrast media)
Iodide ion converts insoluble HgS into soluble mercuric iodide and iodomercurate complexes in the gut. The entire safety argument for cinnabar rests on HgS being insoluble; iodide removes that argument. This incompatibility is standard teaching in Chinese hospital pharmacy and is reported as a cause of drug-induced enteritis with bloody diarrhoea.
Clinical note: Do not co-prescribe. Separate cinnabar-containing patent formulas from any iodide preparation, including radiocontrast, and ask specifically about iodide expectorants and thyroid preparations before dispensing.
Sodium bromide, potassium bromide and bromide-containing sedatives
The same halide chemistry as iodide. Bromide converts HgS to soluble mercuric bromide in the gastrointestinal tract, defeating the low-solubility basis of cinnabar's tolerability. The pairing is particularly likely in practice because both drugs are used as sedatives.
Clinical note: Absolute avoidance. A patient on a bromide sedative should not be given a cinnabar-containing formula at all.
Nephrotoxic drugs (aminoglycosides, cisplatin, ciclosporin, NSAIDs, tenofovir)
Absorbed mercury from cinnabar distributes chiefly to the renal cortex and produces the inorganic-mercury pattern of proximal tubular necrosis; rat studies of cinnabar-containing Zhu-Sha-An-Shen-Wan show renal mercury accumulation and tubular biomarker change on repeated dosing. Any concurrent tubular toxin is additive on the same target, and the kidney is also the organ that must clear the mercury.
Clinical note: Do not use cinnabar-containing formulas in anyone with existing renal impairment or on a nephrotoxic drug. If a cinnabar formula has been used, check renal function and urinary mercury rather than assuming the insolubility argument protects the patient.
Realgar (As4S4) in combined mineral formulas such as An Gong Niu Huang Wan and Hua Feng Dan
Several of the best-known patent formulas contain both cinnabar and realgar, so a single prescription delivers two heavy-metal loads with different target organs (renal and neurological for mercury, dermatological, hepatic, haematological and carcinogenic for arsenic). Reviews of these formulas treat the two minerals together for exactly this reason. Cumulative dosing across an unmeasured course is the practical hazard, not a single dose.
Clinical note: Treat a combined cinnabar-realgar formula as short-course emergency medicine only, never as maintenance therapy, and count total metal intake across every product the patient is taking, including over-the-counter patent pills.
Chelating agents (DMPS, DMSA/succimer, D-penicillamine)
These are the treatment for mercury poisoning rather than a hazard, and oral chelation has been shown to clear tissue mercury in patients poisoned by mercury-containing traditional medicines. They are listed here because their use marks the point at which cinnabar has already caused harm, and because mobilising stored mercury transiently raises circulating mercury.
Clinical note: Chelation is a specialist toxicology decision, not a herbalist's. Stop the cinnabar source first; chelation without stopping the source achieves nothing.
Lead tetroxide (red lead, minium, Pb3O4; the TCM drug Qian Dan)
Red lead is the classic historical adulterant of and substitute for cinnabar as a red pigment, and both are red mineral powders sold under overlapping names. Where medicinal cinnabar is counterfeited, lead tetroxide is the obvious cheap substitute, and it delivers lead rather than mercury with an entirely different toxic profile. The two minerals are trivially distinguished analytically and not at all by eye.
Clinical note: Buy only from a supplier who provides elemental analysis. A red mineral powder of unknown provenance should not be dispensed on the basis of colour.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| powder | 0.1–0.5 g | Once daily | — | — | ChP 2025. 多入丸散服，不宜入煎剂 — given in pills or powder; NOT to be put in a decoction. Toxic: not to be taken in large doses, nor in small doses over a long period. Contraindicated in pregnancy and in impaired liver or kidney function. Heating decomposes HgS and liberates mercury. Corrected from a generic 9-30g decoction filler value generated from tcm_category. |
| topical | Appropriate amount | — | — | — | ChP 2025. 外用适量。 |
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
Two heavy minerals that together anchor the spirit and draw Heart fire down to the Kidney, calming palpitations and improving vision and hearing.
Palpitations, insomnia and tinnitus from Heart-Kidney disharmony (with Shen Qu to protect the stomach). Zhu Sha contains mercury; never heat it; short-term use only.
Core pair of a classical formula — Ci Zhu Wan (Shen Qu Wan), Bei Ji Qian Jin Yao Fang (Sun Simiao)
Heavy settling of the Heart combined with bitter-cold draining of Heart fire, which calms the spirit when Heart fire is blazing.
Heart fire with irritability, insomnia and palpitations. Zhu Sha contains mercury; never heat it, avoid long-term use, contraindicated in pregnancy and in kidney or liver impairment.
Core pair of a classical formula — Zhu Sha An Shen Wan, Nei Wai Shang Bian Huo Lun (Li Dongyuan)
Bitter-cold purging of heat combined with heavy settling and clearing of the Heart, which moves the bowels while calming irritability.
Heat constipation with irritability and insomnia. Zhu Sha contains mercury and must never be heated or taken long term; Lu Hui is contraindicated in pregnancy.
Core pair of a classical formula — Geng Yi Wan, Xian Xing Zhai Yi Xue Guang Bi Ji (Miao Xiyong)
Evidence Tier
Moderate evidence · 7 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
0
Observational / case report
0
In vitro / animal
7
3 verified · 4 unverified
Show 7 studies
- Neurotoxicological effects of cinnabar (a Chinese mineral medicine, HgS) in mice
- Exposure to Low Dose of Cinnabar (a Naturally Occurring Mercuric Sulfide (HgS)) Caused Neurotoxicological Effects in Offspring Mice
- Nephrotoxicity of mercuric chloride, methylmercury and cinnabar-containing Zhu-Sha-An-Shen-Wan in rats
- In vitro studies on dissolved substance of cinnabar: Chemical species and biological properties
- Cinnabar is not converted into methylmercury by human intestinal bacteria
- Methylation of Mercury by Bacteria Exposed to Dissolved, Nanoparticulate, and Microparticulate Mercuric Sulfides
- Traditional Chinese medicine Zhusha Anshen Wan: protective effects on liver, kidney, and intestine of the individual drugs using 1H NMR metabolomics
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
Neurotoxicological effects of cinnabar (a Chinese mineral medicine, HgS) in mice
Oral cinnabar in mice produced mercury accumulation in brain and kidney and measurable neurotoxic change, establishing that swallowed HgS is not biologically inert. The authors note the doses needed are far above those needed for methylmercury, which is the basis of the claim that cinnabar is comparatively less toxic - it is not a claim that it is safe.
Exposure to Low Dose of Cinnabar (a Naturally Occurring Mercuric Sulfide (HgS)) Caused Neurotoxicological Effects in Offspring Mice
Low-dose maternal cinnabar exposure produced neurobehavioural deficits in offspring mice together with mercury accumulation in the developing brain. This is the most directly relevant experimental evidence for the paediatric question, because cinnabar-containing patent formulas are given to children for fright, convulsion and sleeplessness, and the developing nervous system is the tissue least able to tolerate any mercury burden.
Nephrotoxicity of mercuric chloride, methylmercury and cinnabar-containing Zhu-Sha-An-Shen-Wan in rats
Compared the cinnabar-containing formula Zhu-Sha-An-Shen-Wan with mercuric chloride and methylmercury in rats. The formula produced renal mercury accumulation with a milder tubular injury profile than mercuric chloride at equivalent mercury doses, but the kidney remained the target organ, confirming that repeat dosing loads the renal cortex with mercury.
In vitro studies on dissolved substance of cinnabar: Chemical species and biological properties
Identified the mercury species that actually dissolve from cinnabar under simulated gastric and intestinal conditions as mercuric polysulfides and Hg3S2Cl2, characterised their binding to human serum albumin and their permeability across Caco-2 monolayers, and found them less cytotoxic to HK-2 renal cells than mercuric chloride. This is the paper that defines the soluble fraction, and it confirms such a fraction exists.
Cinnabar is not converted into methylmercury by human intestinal bacteria
Incubated cinnabar with human intestinal bacteria and found no methylmercury by GC-ECD or GC-MS, concluding that HgS is transformed to mercuric polysulfides rather than methylated in the human gut. This is a negative result and it bounds the methylation concern for the gut specifically; it does not bound methylation of HgS by anaerobic environmental bacteria, where nanoparticulate HgS is demonstrably methylated.
Methylation of Mercury by Bacteria Exposed to Dissolved, Nanoparticulate, and Microparticulate Mercuric Sulfides
Sulfate-reducing bacteria methylated mercury supplied as nanoparticulate HgS at rates several-fold higher than from microparticulate crystalline HgS, with disordered nanoparticle surfaces releasing labile mercury. This is environmental microbiology rather than a study of the drug, but it is the reason the blanket claim that HgS cannot be methylated is unsafe: particle size and crystallinity, which grinding changes, govern methylation potential.
Traditional Chinese medicine Zhusha Anshen Wan: protective effects on liver, kidney, and intestine of the individual drugs using 1H NMR metabolomics
Metabolomic comparison of the cinnabar-containing formula with cinnabar alone in rodents, reporting that the accompanying herbs attenuate the hepatic, renal and intestinal metabolic disturbance caused by cinnabar given alone. The finding supports the traditional argument for compounding but does not establish a safe cumulative mercury dose, and the study is preclinical.
⚠ 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.
Pregnancy
Avoid toxic (mercury)
Breastfeeding
Avoid mercury — toxic to infant
Continuous use
No published day limit; prolonged use cautioned — “本品有毒，不宜大量服用，也不宜少量久服 — toxic; not to be taken in large amounts, nor in small amounts over a long period”
孕妇及肝肾功能不全者禁用 — contraindicated in pregnancy and in hepatic or renal impairment. ChP dose 0.1–0.5 g, in pills or powders, not decocted. Source: 《中华人民共和国药典》2020年版一部 — 朱砂 【注意】(p. 143). Pending clinical review.
A patient's own days on this herb are counted on their patient page (practitioners only).
Historical Texts
Shen Nong Ben Cao Jing
Han dynasty, compiled c. 200 CENei Wai Shang Bian Huo Lun (attributed to Li Dongyuan)
Jin-Yuan period, 1247Ben Cao Gang Mu (Li Shizhen)
Ming dynasty, 1596Wen Bing Tiao Bian (Wu Jutong)
Qing dynasty, 1798References
- Liu J, Shi JZ, Yu LM, Goyer RA, Waalkes MP. Mercury in Traditional Medicines: Is Cinnabar Toxicologically Similar to Common Mercurials? . Experimental Biology and Medicine (2008) [DOI]
- Liu J, Wei LX, Wang Q, Lu YF, Zhang F, Shi JZ, Li C, Cherian MG. A review of cinnabar (HgS) and/or realgar (As4S4)-containing traditional medicines . Journal of Ethnopharmacology (2018) [DOI]
- Zhao M, Li Y, Wang Z. Mercury and Mercury-Containing Preparations: History of Use, Clinical Applications, Pharmacology, Toxicology, and Pharmacokinetics in Traditional Chinese Medicine . Frontiers in Pharmacology (2022) [DOI]
- Guan H, Xu Y, Ma C, Zhao D. Pharmacology, Toxicology, and Rational Application of Cinnabar, Realgar, and Their Formulations . Evidence-Based Complementary and Alternative Medicine (2022) [DOI]
- Kang-Yum E, Oransky SH. Chinese patent medicine as a potential source of mercury poisoning . Veterinary and Human Toxicology (1992)
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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