Wu Bei Zi (Gallnet of Chinese Sumac)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Wu Bei Zi?

  Roughly 3–6 g in decoction — this matches the current Chinese Pharmacopoeia range; some materia medica sources give a slightly wider 1.5–9 g depending on preparation (decoction vs. powder/pill). Topically, it is used as a fine powder or concentrated wash applied directly to the affected skin, dosed by area rather than weight.

  Note: published dosage ranges vary somewhat by source (roughly 1.5–9 g across different materia medica), likely reflecting decoction vs. powdered/pill preparation rather than a real disagreement. The current Chinese Pharmacopoeia figure of 3–6 g is given as the primary reference.

  Source: Chinese Pharmacopoeia (2020) range as reported in materia medica summaries; cross-checked against multiple published TCM references. Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Wu Bei Zi?

  Wu Bei Zi is strongly astringing and is traditionally contraindicated in early-stage external (wind-cold/wind-heat) cough and in damp-heat diarrhea/dysentery — because binding the Lung or Intestines too early can trap a pathogen inside ("locking the door on the thief"). It is best reserved for chronic, deficiency-type presentations once any external or excess-heat component has cleared, and used under a qualified practitioner.

  • Not for acute/external-pattern cough — e.g., cough from a fresh wind-cold or wind-heat invasion.
  • Not for damp-heat or acute excess diarrhea/dysentery — astringing too early can retain the pathogenic factor.
  • Timing with other oral medications — because of its very high tannin content, some practitioner sources advise separating Wu Bei Zi (or its decoction) from other orally taken medications by a couple of hours to avoid tannin–drug binding reducing absorption (see Drug interactions).

  Source: materia medica consensus on the astringent-herb category's excess/external-pattern contraindications; practitioner reference sources on tannin–drug timing.

Chinese Herb Toxicity & Overdose

• Low, at traditional oral doses. In a formal safety evaluation of a Galla Chinensis oral solution, the median lethal dose (LD50) in mice exceeded 5,000 mg/kg with no toxicity signs at that ceiling, and the preparation was classified as practically nontoxic. As with other very-high-tannin substances, excessive or prolonged oral intake beyond traditional dosing is not advised, since tannins can irritate the digestive tract and bind dietary minerals/proteins at high intake.

  Source: PMID 28811824 (Galla Chinensis oral solution safety evaluation, mouse LD50). Reference note, not a safety guarantee.

Herb-Drug Interactions

• No well-established clinical herb–drug interaction trials are documented for Wu Bei Zi specifically. However, its defining chemistry — tannins reported at roughly 50–70% of the gallnut — is a general basis for caution: tannins are well known to bind (chelate) alkaloids, iron and other minerals, and some proteins/enzymes in the gut, which can reduce the absorption of co-administered oral medications or mineral supplements. Some practitioner sources advise spacing Wu Bei Zi from other oral drugs by roughly two hours as a precaution. (Flagged for practitioner confirmation; not a demonstrated clinical interaction.)

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 Wu Bei Zi (Galla Chinensis)?

  Yes — Galla Chinensis is one of the most tannin-dense substances in the Chinese materia medica, with laboratory and animal research supporting several of its traditional uses. A comprehensive 2021 review found tannins make up roughly 50–70% of the gallnut by weight (with over 50 chemical constituents identified overall), and summarized documented anti-caries, antibacterial, antiviral, anticancer, antioxidant, and anti-inflammatory effects, alongside its long traditional use (1,400+ years) for diarrhea, bleeding, cough, sweating, and prolapse.

  • Antidiarrheal (animal model) — a standardized Galla Chinensis oral solution showed significant antidiarrheal activity in a castor-oil-induced diarrhea model in mice (p < 0.01), with effects comparable in direction to a standard antidiarrheal drug, supporting the traditional intestine-binding/anti-diarrhea use.
  • Antibacterial / infection protection (animal model) — a tannin-rich Galla Chinensis extract improved survival and reduced diarrheal symptoms and inflammation in mice infected with enterotoxigenic E. coli O101, with mechanisms including immune modulation and preservation of gut-barrier integrity.
  • Topical/dermatologic (animal model) — a Galla Chinensis solution applied topically for fungal skin infection (dermatophytosis) in an animal model achieved high fungal-clearance rates over 14 days, consistent with the traditional topical use for damp, infected skin sores.

  Most direct efficacy evidence to date is preclinical (cell/animal); the chemistry (very high tannin content) and long clinical-use history are the strongest-supported traditional/reference points.

  Note: the current Sacred Lotus records the Latin as “Galla Rhois,” while most modern pharmacology literature uses “Galla Chinensis.” Both names refer to the same gallnut — formed by the aphid Melaphis (syn. Schlechtendalia) chinensis on Rhus (Chinese sumac) species — so we believe this is a naming/variant match, not a substance discrepancy; the identity field is left unchanged pending owner confirmation.

  Sources: PMID 34052353, DOI 10.1016/j.jep.2021.114247 (comprehensive botany/chemistry/pharmacology/toxicology review); PMID 28811824, DOI 10.1155/2017/1851459 (oral solution antidiarrheal activity and safety); PMID 33676495, DOI 10.1186/s12906-021-03261-x (tannin extract vs. enterotoxigenic E. coli infection, mouse model); PMID 29259645, DOI 10.1155/2017/3843595 (topical solution for dermatophytosis, animal model). Research context, not a therapeutic claim.

Chinese Herb Notes

• How is Wu Bei Zi different from Wu Wei Zi and He Zi?

  All three are sour astringents used for chronic cough, but Wu Bei Zi is the coldest and most detoxifying, while Wu Wei Zi is warming and tonifying, and He Zi sits in between with a throat-benefiting action. Choice depends on the accompanying pattern (deficiency-cold vs. lingering heat/toxicity).

  • Wu Wei Zi (Schisandra Fruit) — sour but warm; more powerfully astringes Lung qi and grasps Kidney qi, and additionally tonifies qi, nourishes yin, and calms the spirit — the stronger overall tonic of the three.
  • He Zi (Myrobalan Fruit) — astringes the Lung and binds the Intestines similarly to Wu Bei Zi, and is distinguished by also benefiting the throat (hoarseness, loss of voice); used raw to clear heat/sore throat or prepared for stronger astringency.
  • Wu Bei Zi — the coldest of the three and, per traditional differentiation, comparatively weaker at astringing the Lung and Intestines than Wu Wei Zi or He Zi, but stronger at clearing heat toxicity, stopping bleeding, and generating fluids — and it stands apart for its concentrated-tannin topical use on damp sores, which the other two are not typically used for.

  Common combinations (traditional context, not treatment advice): with Wu Wei Zi and He Tao Rou (walnut) for chronic Lung/Kidney-deficiency cough; with calcined Long Gu (dragon bone) ground and applied to the navel as a topical plaster for night sweats; with Qian Shi (Euryale Seed) for chronic diarrhea and leakage patterns.

  Source: materia medica consensus (Bensky-aligned differentiation of the astringent-herb category); Sacred Lotus category grouping (Herbs that Stabilize and Bind).