Bi Cheng Qie (Litsea)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Bi Cheng Qie?

  Materia medica sources give roughly 1.5–6 g in decoction, most commonly cited as 1.5–3 g on the low end and up to 5–6 g in other references; it is also prepared as a 0.5–1 ml tincture. It is typically decocted together with other Middle- or Lower-Jiao warming, qi-moving herbs rather than used alone at high dose.

  Note: Cited ranges vary by source (e.g. 1.5–3 g vs. 1.5–5/6 g) — this reflects normal variation across materia medica texts rather than a real disagreement about the herb, so the fuller range is kept here.

  Source: dosage ranges cross-referenced against multiple online sources (1.5–5 g decoction; 0.5–1 ml tincture; 1.5–3 g also reported). Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Bi Cheng Qie?

  Bi Cheng Qie is contraindicated in yin-deficiency heat, Blood-level (xue) heat, and fever with cough — being acrid, warming, and aromatic, it can aggravate heat and further injure yin if used in these patterns.

  • Crude herb vs. essential oil (reference note) — traditional TCM use is the dried fruit taken at gram-level decoction doses. The distilled essential oil sold for aromatherapy/cosmetic use is a much more concentrated product and is documented as an irritant to skin and eyes and a potential skin/respiratory sensitizer at that concentration; the two forms are not interchangeable in dosing.

  Source: multiple online sources (contraindications); commercial essential-oil safety data sheets (concentrate-handling caution, reference only).

Chinese Herb Toxicity & Overdose

• Low, based on animal testing of the essential oil. Acute toxicity studies in rodents found an oral LD50 of roughly 4,000 mg/kg, dermal LD50 above 5,000 mg/kg, and inhalation LC50 near 12,500 ppm for Litsea cubeba essential oil — classified as “slightly toxic” — and genetic-toxicity assays (bacterial mutagenicity, bone-marrow micronucleus, chromosome aberration) were negative. These figures describe the concentrated essential oil rather than the crude decocted dried fruit used at gram-level TCM doses, for which no significant toxicity has been reported at customary doses.

  Source: PMID 15771186 (acute and genetic toxicity of Litsea cubeba essential oil, rodent models). Reference note, not a safety guarantee.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Bi Cheng Qie. A preclinical signal exists for its main essential-oil constituent: in a mouse model, citral altered hepatic cytochrome P450 activity — inducing CYP1A2, 2D22, and 2E1 and suppressing CYP3A11 at experimental doses — which raises a theoretical caution around concurrent heavy use of concentrated Litsea cubeba essential oil alongside CYP-metabolized medications. This is animal/preclinical evidence, not a demonstrated clinical interaction, and does not necessarily apply to the low-dose decocted dried fruit. (Flagged for practitioner awareness, not an established 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 Bi Cheng Qie (Litsea cubeba)?

  Yes — mostly on its citral-rich essential oil, with preclinical antimicrobial and anti-inflammatory evidence plus one small human aromatherapy trial; clinical research on the traditional internal (decocted fruit) use itself remains limited. Chemically, the oil is dominated by citral (trans- and cis-citral together, roughly 60–70%), with d-limonene and linalool as notable minor constituents.

  • Antifungal (in vitro + molecular docking) — among 23 essential oils screened against Candida albicans, Litsea cubeba oil showed the strongest inhibition; docking simulations showed the oil’s components binding the fungal enzymes SAP5 and β-1,3-glucan synthase.
  • Anti-inflammatory / gut microbiome (mouse, LPS-challenge model) — oral Litsea cubeba essential oil reduced TNF-α, IL-6, and IL-1β in liver and intestinal tissue, protected intestinal crypt/epithelial integrity, and reshaped gut microbial populations; citral showed strong docking affinity to these inflammatory cytokines. Animal model, not clinical proof.
  • Aromatherapy / mood and cortisol (human, crossover, n = 15) — inhaling Litsea cubeba essential oil vapor significantly reduced total mood disturbance and confusion scores, and lowered salivary cortisol, versus a water-vapor control, with heart rate/blood pressure unaffected — a small but genuinely human study that resonates with the herb’s traditional description as aromatic and qi-opening.
  • Toxicology — rodent acute and genetic toxicity testing of the essential oil found it “slightly toxic” with negative genotoxicity (see Toxicity above).

  An important caveat: nearly all of this research studies the isolated essential oil (as used in aromatherapy, food flavoring, and agriculture), not the crude decocted dried fruit as used internally in TCM — a distinction worth keeping in mind when weighing its relevance to traditional use.

  Sources: PMID 35793977, DOI 10.5650/jos.ess22108 (antifungal/molecular docking); PMID 37645231, PMC 10461084, DOI 10.3389/fmicb.2023.1233934 (anti-inflammatory/gut microbiome, mouse); PMID 32774414, PMC 7399754, DOI 10.1155/2020/4389239 (human aromatherapy crossover trial); PMID 15771186 (acute/genetic toxicity). Research context, not a therapeutic claim.

Chinese Herb Notes

• How is Bi Cheng Qie different from Wu Yao and Gao Liang Jiang? What does it combine with?

  Bi Cheng Qie is distinguished by acting on both the Middle Jiao (Spleen/Stomach) and the Lower Jiao (Kidney/Bladder) — unlike Gao Liang Jiang, which is a Middle-Jiao (Stomach) warming analgesic only, and it shares its Lower-Jiao, cold-urinary-dribbling use with Wu Yao, with which it is frequently paired.

  • Wu Yao — also moves qi and warms both Middle and Lower Jiao (chest/abdominal distention, frequent urination); often combined with Bi Cheng Qie to reinforce the cold-urinary-dribbling action.
  • Gao Liang Jiang — warms the Stomach specifically for cold-type pain and vomiting; has no Lower-Jiao/urinary application.
  • Bi Cheng Qie — the one with a genuine dual Middle- and Lower-Jiao warming action, and notably aromatic.

  Common combinations: with Gao Liang Jiang, Sheng Jiang, and Shen Qu for cold-type epigastric/abdominal pain with hiccup; with Wu Yao (sometimes plus Xiao Hui Xiang) for cold, painful urinary dribbling and frequent clear urination; combined with Gao Liang Jiang and Rou Gui in the formula Bi Cheng Qie Wan for Stomach-cold pain. (Traditional formula context, not treatment advice.)

  Source: multiple online sources; standard Herbs that Warm the Interior differentiation conventions.