Hei Xi Dan (Lead Special Pill)

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Indications

Western Uses:

• What is Hei Xi Dan used for in modern practice?

  Hei Xi Dan is not used in modern TCM practice. Its chief ingredient, Hei Xi, is metallic lead, and it also contains Liu Huang (sulfur); both are heavy-metal/mineral substances with well-documented toxicity, and formulas of this class have been superseded by non-mineral alternatives (e.g., Si Ni Tang and related Yang-rescuing decoctions) that achieve a comparable therapeutic aim without lead exposure.

  The modern literature relevant to Hei Xi Dan is toxicological rather than therapeutic: case reports and reviews document lead poisoning from lead-containing traditional Chinese medicine preparations, with clinical presentations including abdominal (periumbilical) colic, constipation, anemia, and non-specific systemic symptoms that are frequently misdiagnosed. This is offered strictly as public-safety reference context explaining why this historical formula has no place in contemporary clinical use — it is not a treatment claim, and no administration or dosing information is given anywhere in this record.

  Source: PubMed 29081456 (lead poisoning from TCM, case report and literature review of cases 1977–2017); PubMed 36176514 / PMC 9513390 (non-occupational lead poisoning from TCM, case report); PubMed 25048473 / PMC 4108800 (metal-contamination adverse events review, Korea). Reference/public-safety context only, not a treatment claim.

Originally Appeared In:

• Imperial Grace Formulary of the Tai Ping Era (Tai Ping Hui Min He Ji Ju Fang)

Notes:

• What is the origin of Hei Xi Dan, and why is it no longer used?

  Hei Xi Dan originates in the Tai Ping Hui Min He Ji Ju Fang (“Formulas of the Peaceful Benevolent Dispensary”), an official formulary compiled by the Imperial Medical Bureau of the Song dynasty (960–1127 CE) — among the earliest state-issued patent-medicine formularies. It belongs to the same historical category as Si Ni Tang and other “Formulas that Rescue Devastated Yang,” but is distinguished by its use of mineral, rather than purely botanical, ingredients to anchor floating Yang.

  Modern practice has moved away from it because its chief ingredient is metallic lead, a substance with cumulative, well-documented toxicity (see the Western Uses section and cautions). Non-mineral Yang-rescuing formulas such as Si Ni Tang (Frigid Extremities Decoction) are used in contemporary practice to address collapsing Yang without lead exposure.

  Discrepancy note: the ingredient name Hei Xi (黑錫) translates literally as “black tin,” and multiple online sources gloss it as “Stannum Nigrum” (tin). This database and multiple online sources identify Hei Xi pharmacologically as lead (Plumbum), consistent with the historical use of “black lead” terminology in Chinese materia medica and with the traditional preparation method (see the preparation section). This record follows the lead identification as authoritative per the local database; the literal-translation/tin gloss is noted here rather than omitted, since it reflects a real naming ambiguity in the secondary literature rather than a resolvable error.

  Source: classical source Tai Ping Hui Min He Ji Ju Fang (Song dynasty) + multiple online sources for origin and naming; this site’s own herb identity for the lead identification.

Clinical Studies & Research:

• Is there modern research on Hei Xi Dan?

  No formula-specific pharmacological or clinical research on Hei Xi Dan itself was found. The relevant modern literature is toxicological: case reports and clinical reviews documenting lead poisoning from lead-containing traditional Chinese medicine preparations, of the same general class as Hei Xi Dan, explain why mineral-lead formulas fell out of use.

  • Case report and literature review (1977–2017): a 66-year-old patient using homemade TCM containing over 4,000 mg/kg of lead presented with abdominal colic and constipation and a blood lead level of 657 μg/L; the review identified ten comparable published cases over four decades (PubMed 29081456).
  • Case report (2022): a 21-year-old patient using TCM pills and powder for acne developed severe lead poisoning, with a blood lead level of 1,268.4 μg/L against medication lead content of 8,421 μg/g in the pill form (PubMed 36176514 / PMC 9513390).
  • Clinical review (2014, Korea): a review of ten publications and 22 cases of metal poisoning from TCM, predominantly lead, found reported daily lead intakes 3–4,000 times recommended limits in some products, with abdominal pain in over 80% of cases (PubMed 25048473 / PMC 4108800).

  Sources: PubMed 29081456; PubMed 36176514 / PMC 9513390; PubMed 25048473 / PMC 4108800. Toxicological/public-safety research context, not a therapeutic claim; no formula-specific efficacy research exists for Hei Xi Dan.