Qian Dan (Lead Oxide)

Chinese Herb Actions

Chinese Herb Contraindications & Cautions

• Are there cautions or restrictions on Qian Dan (lead oxide)?

  Qian Dan is a lead compound and is treated as unsafe for internal use in modern practice. Its historical internal applications were abandoned once lead's toxicity was understood, and contemporary Chinese medicine restricts it to external, professionally supervised use only — in small amounts, for limited periods, and never on broken skin, mucous membranes, or large body-surface areas, because lead can be absorbed systemically through the skin.

  • Pregnancy and lactation — avoided outright; lead crosses the placenta and is excreted in breast milk, and even low-level exposure is linked to adverse fetal/infant neurodevelopment.
  • Children — considered especially vulnerable; pediatric lead exposure is associated with neurodevelopmental effects, including at blood-lead levels once considered background/normal.
  • Prolonged, repeated, or large-surface topical use — the documented mechanism behind real-world poisoning cases (see toxicity/research below); cumulative systemic absorption, not a single exposure, is the typical pathway to toxicity.
  • Regulatory/public-safety context — lead-containing external TCM preparations have been the subject of public-health case reports and warnings in multiple countries; unverified or untested products carry unknown lead content and risk.

  Source: PMID 23582936 (Wu et al., American Journal of Medicine, 2013); PMID 27486361 / PMC 4961898 (Wani et al., Interdisciplinary Toxicology, 2015); CDC Childhood Lead Poisoning Prevention program guidance. Neutral safety reference, not usage instructions.

Chinese Herb Toxicity & Overdose

• Lead tetroxide is systemically toxic, and no safe exposure level has been established. Its traditional external use in Chinese medicine is a documented real-world pathway to clinical lead poisoning: absorption occurs through broken or diseased skin (the ulcers/sores Qian Dan was traditionally applied to are themselves higher-risk absorption sites), and lead accumulates in blood, soft tissue, and bone.

  • Documented case — a patient using a lead-containing herbal patch (517 mg lead per gram of patch) on a chronic leg ulcer for about three months developed anorexia, weight loss, headache, dizziness, nausea, vomiting, constipation, weakness, and anemia, with a blood lead concentration of 226 µg/dL; the patient recovered after chelation therapy (EDTA and DMSA).
  • Systemic effects of lead toxicity generally — central nervous system impairment (cognitive/behavioral effects, most severe in children), inhibited heme synthesis leading to anemia, nephrotoxicity, reproductive/developmental harm, and increased cardiovascular risk.
  • No safe threshold — public-health authorities (e.g., the US CDC, following a 2012 national toxicology review) recognize no safe blood-lead level, particularly for children; adverse effects have been documented at levels once considered background/normal.

  Source: PMID 23582936 (Wu et al., American Journal of Medicine, 2013); PMID 27486361 / PMC 4961898 (Wani et al., Interdisciplinary Toxicology, 2015, lead toxicity review); CDC Childhood Lead Poisoning Prevention program guidance. Toxicology reference, not a treatment protocol.

• This herb is considered toxic.
  (while some Chinese herbs are toxic, it must be noted that many come prepared, or are combined, to mitigate their toxicity)

Herb-Drug Interactions

• No pharmacological herb–drug interaction in the conventional sense is documented for Qian Dan. The clinical literature instead documents lead poisoning itself as the adverse event of concern, sometimes alongside co-exposure to other toxic minerals present in the same traditional preparation — one reported topical case involved a product containing lead, mercury, and arsenic together, compounding systemic toxicity. Management of lead poisoning (chelation therapy such as EDTA or DMSA) is a separate medical intervention, not a pharmacological interaction with the herb itself.

  Source: PMID 23582936 (Wu et al., American Journal of Medicine, 2013). Reference note, not a comprehensive interaction check.

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Qian Dan (lead oxide, Pb3O4)?

  Yes — modern research on Qian Dan is almost entirely toxicological rather than pharmacological, focused on documenting lead-poisoning risk from lead-containing traditional medicines rather than establishing therapeutic efficacy. No clinical trials supporting a therapeutic benefit were identified.

  • Classical toxicity classification — a peer-reviewed overview of traditional Chinese Materia Medica toxicity documentation names lead tetroxide (qian dan) among the highly toxic mineral substances still in occasional TCM use, tracing toxicity awareness through the historical three-tier (superior/medium/inferior) classification system of multiple online sources Bencao Jing.
  • Case-report evidence of topical poisoning — a peer-reviewed case report documents systemic lead poisoning (blood lead 226 µg/dL) from an herbal patch applied to a chronic leg ulcer, with recovery after chelation therapy; the case is specifically cited as an example of lead, mercury, and arsenic poisoning from topical TCM use.
  • Broader TCM lead-contamination literature — separate case reports document lead poisoning from other TCM products via manufacturing contamination rather than an intentionally lead-containing substance; one 2022 case involved oral TCM powder/pills contaminated with lead (blood lead 1,268 µg/L) — a different exposure route than Qian Dan's traditional external use, included here for broader safety context rather than as evidence about Qian Dan specifically.
  • General lead toxicology — a 2015 toxicology review summarizes lead's effects across the nervous, hematologic, renal, reproductive, and cardiovascular systems, with the nervous system considered most vulnerable, particularly in children.

  Overall, the modern evidence base treats Qian Dan as a toxicology/public-safety subject rather than a subject of therapeutic research.

  Sources: PMID 16787890 (Leung, Toxicologic Pathology, 2006); PMID 23582936 (Wu et al., American Journal of Medicine, 2013); PMID 36176514 / PMC 9513390 (Ma et al., Frontiers in Public Health, 2022); PMID 27486361 / PMC 4961898 (Wani et al., Interdisciplinary Toxicology, 2015). Research context, not a therapeutic claim.

Chinese Herb Notes

• What is Qian Dan made of, and how does it relate to other mineral substances in Chinese medicine?

  Qian Dan is produced by controlled heating and oxidation of metallic lead, yielding an orange-red to orange-yellow heavy mineral powder — lead tetroxide (Pb3O4), known industrially as minium or red lead. It belongs to a small group of toxic mineral substances in the traditional pharmacopeia — alongside mercury-based agents (e.g., calomel/Hong Fen) and arsenic-based agents (e.g., realgar/Xiong Huang) — all restricted to careful, limited external use because of heavy-metal toxicity.

  • Aliases — also recorded as Huang Dan (黄丹) and Hong Dan (红丹) in different regional/period sources.
  • Toxicity does not process out — unlike some botanical toxins that can be moderated by processing (paozhi), Qian Dan's risk comes from its elemental lead content, which traditional processing does not remove.

  Note: This site’s own record records the taste as acrid (“Spicy”) and cool; some published TCM reference compilations (e.g. and multiple online sources) additionally list a salty taste. We could not independently verify which classical source assigns the salty taste, so this site’s existing property field is left unchanged; only the acrid/cool/toxic profile is treated as verified here.

  Source: multiple online sources; this site’s own reference record.

This herb is toxic or restricted in the United States