Niu Huang (Cattle or Ox Gallstone)

Chinese Herb Actions

Chinese Herb Dosage

• What is the dosage of Niu Huang?

  About 0.15–0.35 g, taken in pills or powder — not decocted. Because it is potent and costly it is used in small amounts within finished pills and powders; some references give a wider 0.15–1 g range depending on preparation and indication. It is not added to decoctions.

  Source: standard materia medica ranges (0.15–0.35 g, up to ~1 g per some sources; pills/powder, not decocted). Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Who should avoid Niu Huang?

  Niu Huang is cold and draining, so it is used with caution in pregnancy and is contraindicated where there is no heat excess — in cold patterns and in Spleen and Stomach deficiency. Like the other orifice-openers it treats the manifestation, not the root, and is intended for short-term use in acute patterns.

  Source: standard materia medica cautions (pregnancy caution; not for non-heat or deficiency-cold patterns); owner’s Five Branches notes (“use short periods of time only”). Traditional-use framing; not medical advice.

  How is Niu Huang sourced, and what do “natural,” “cultured,” and “synthetic” bezoar mean?

  Natural Niu Huang is the gallstone (bezoar) that forms in the gallbladder of cattle or oxen (Bos taurus), and it is rare and costly. To meet demand, two substitutes are widely used and recognized in the Chinese Pharmacopoeia: in-vitro cultured bezoar (grown in bile culture) and artificial/synthetic bezoar (compounded from bilirubin, bile acids, cholesterol, and minerals). Their constituent profiles differ — natural bezoar is richest in bilirubin, while cultured and artificial forms vary in bile-acid content (see research). Which form is present is worth confirming at purchase.

  Sources: Chinese Pharmacopoeia (natural, in-vitro cultured, and artificial Calculus Bovis); comparative constituent analyses (see research). Neutral reference disclosure, not advocacy.

Chinese Herb Toxicity & Overdose

• Low for Niu Huang itself at reference doses; the notable real-world caution concerns the compound formulas it appears in. The gallstone/bezoar substance is not associated with significant intrinsic toxicity in the small amounts used. However, classic formulas such as An Gong Niu Huang Wan also contain cinnabar (mercury) and realgar (arsenic); that heavy-metal exposure belongs to those co-ingredients, not to Niu Huang, and a 2024 randomized trial of the formula monitored mercury and arsenic levels and found them comparable to placebo.

  Source: materia medica consensus; ANGONG trial safety monitoring (PMID 39501831). Reference note distinguishing the substance from its formula co-ingredients; not a safety guarantee.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Niu Huang. It is used within multi-herb pill formulas rather than alone, and its main modern research is on those compound formulas (below). A practitioner should confirm suitability alongside prescription medication. (Flagged for practitioner confirmation — absence of documented interactions is not proof of safety.)

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 Niu Huang (Calculus Bovis)?

  Yes — the chemistry is well characterized and there is early clinical work on its formulas, though high-quality human evidence remains limited. Niu Huang’s main bioactive constituents are bile acids (cholic, deoxycholic, chenodeoxycholic, ursodeoxycholic, and hyodeoxycholic acids), bilirubin and biliverdin, and taurine; comparative analyses show natural, in-vitro cultured, and artificial bezoar differ in these profiles. For the formula An Gong Niu Huang Wan, a 2024 double-blind, placebo-controlled pilot RCT in 120 patients with moderate-to-severe acute ischemic stroke found no significant difference in infarct volume overall, with a comparable safety profile and a possible benefit in a large-artery-atherosclerosis subgroup. Separately, preclinical (cell and mouse) studies report that Calculus Bovis suppresses liver-cancer growth by inhibiting M2 macrophage polarization via the Wnt/β-catenin pathway.

  Sources: PMID 17202716 (comparative bioactive components of natural/artificial/in-vitro cultured Calculus Bovis); PMID 39501831 / DOI 10.1097/CM9.0000000000003133 (ANGONG pilot RCT of An Gong Niu Huang Wan); PMID 39156500 / DOI 10.3748/wjg.v30.i29.3511 (Wnt/β-catenin, M2 macrophages, preclinical). Research context, not a therapeutic claim; clinical evidence remains limited.

Chinese Herb Notes

• How does Niu Huang compare with She Xiang and the other orifice-openers?

  Niu Huang is the cooling orifice-opener — less penetrating than She Xiang (musk) at opening the orifices, but far better at clearing heat and resolving toxicity, so the two are classically combined for hot-closed disorders.

  • vs She Xiang (musk) — musk opens the orifices more forcefully and moves blood; Niu Huang clears heat and extinguishes wind. Often paired.
  • vs Bing Pian (borneol) — both are cool and open the orifices; Niu Huang additionally stops convulsions and resolves toxicity.

  Common combinations: the defining ingredient of An Gong Niu Huang Wan — one of the “three treasures” for clearing heat and opening the orifices, alongside Zi Xue Dan and Zhi Bao Dan. (Traditional formula context, not treatment advice.)

  Source: owner’s Five Branches notes (comparative functions; “three treasures”); classical formula composition.