Chuan Niu Xi (Cyathula Root)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Chuan Niu Xi?

  Roughly 3–10 g in decoction — our reference record carries 3–10 g per Chen (or 1–1.5 g as powder) and 4.5–9 g per Bensky. The two published ranges agree closely; the practical working range is the high single digits.

  • Processing — the root is used raw when the intent is to move blood and drain downward. Wine-processing is the traditional variation used to emphasise the blood-invigorating and channel-opening effect.
  • Powder — dosed an order of magnitude lower than the decoction range, as our record notes.

  Source: Sacred Lotus dosage record (3–10 g decoction, 1–1.5 g powder, Chen; 4.5–9 g decoction, Bensky); processing conventions per materia medica consensus, cross-referenced against multiple online sources. Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Chuan Niu Xi?

  Chuan Niu Xi is contraindicated in pregnancy and is not used during excessive menstrual bleeding — those are the two cautions our reference record holds, and both follow directly from its strong downward, blood-moving action. The same two cautions attach to Huai Niu Xi in our records, so getting the identification right does not relax either warning.

  • Pregnancy — contraindicated. Herbs that break blood stasis and drive downward are avoided throughout pregnancy.
  • Heavy or prolonged menstrual bleeding — avoid; it moves blood downward and can worsen the flow.
  • General prudence — as a descending, dispersing herb it is a poor fit for patterns of pure deficiency without stasis, and it is used with care where digestion is weak.
  • Correct identification (reference note) — because “Niu Xi” is used loosely for at least three different roots, the botanical source on the label matters. Substitution between Cyathula and Achyranthes material is documented in practice.

  Source: Sacred Lotus cautions record (pregnancy; excessive menstruation); substitution between the two source plants per PMID 40795998, DOI 10.1093/jpp/rgaf059. Neutral reference disclosures, not usage instructions.

Chinese Herb Toxicity & Overdose

• None Noted

Herb-Drug Interactions

• Does Chuan Niu Xi interact with medications?

  No well-established clinical herb–drug interactions are documented for Chuan Niu Xi, and the pharmacokinetic research needed to identify any is explicitly described as underdeveloped in the current review literature. The reasonable precaution — not a demonstrated interaction — concerns anticoagulant and antiplatelet medication, since the root is used traditionally to move blood and has been reported to affect haemorheology and coagulation in preclinical work. Oestrogen-like activity has also been reported preclinically, which is worth a practitioner’s attention in hormone-sensitive situations. (Precautionary; flagged for practitioner confirmation.)

  Source: pharmacokinetic gap, haemorheological and oestrogen-like activity per PMID 41260548, DOI 10.1016/j.jep.2025.120879. Preclinical context, not a clinical interaction claim.

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 Chuan Niu Xi (Cyathula officinalis)?

  Yes — a comprehensive 2026 review plus a scatter of preclinical pharmacology, but no adequate human trials. The review characterises the root’s constituents as steroids (notably ecdysteroids), saponins, flavonoids and alkaloids, with steroids and saponins treated as the main active fraction, and reports anticoagulant, haemorheology-regulating, antihypertensive, oestrogen-like, anti-inflammatory, antioxidant, immunomodulatory and antitumour activities in laboratory models.

  • Comprehensive review — a 2026 Journal of Ethnopharmacology review covers botany, phytochemistry, pharmacology, pharmacokinetics, safety, processing and quality control for Cyathulae Radix, and concludes that the mechanisms remain unclear and that pharmacokinetic study and quality standards both need to be developed further.
  • Head-to-head with Achyranthes — a 2025 review compared Achyranthes bidentata (Huai Niu Xi) and Cyathula officinalis (Chuan Niu Xi), finding a large number of shared constituents and similar activities, and noting that Cyathula has attracted far fewer pharmacological studies.
  • Inflammatory joint models — an ecdysteroid-enriched fraction suppressed synovial cell proliferation, migration and invasion in vitro and reduced arthritis score and paw swelling in a rat model, with effects linked to PI3K/AKT/mTOR signalling. A separate 2025 review examined both roots in rheumatoid arthritis models. Animal and cell work only.
  • Polysaccharides — root polysaccharides showed antioxidant activity and extended lifespan under heat stress in Caenorhabditis elegans while shifting gut microbial composition; wine-processed material outperformed raw in that model.
  • Wound healing — a branched levan-type fructan was isolated from the roots and characterised for wound-healing activity (laboratory study).

  There is no human clinical trial evidence. Everything above is review, cell or animal research, given as scientific context rather than as a therapeutic claim.

  Sources: PMID 41260548, DOI 10.1016/j.jep.2025.120879 (comprehensive Cyathulae Radix review); PMID 40795998, DOI 10.1093/jpp/rgaf059 (Achyranthes vs Cyathula comparison); PMID 40257367, DOI 10.1080/10286020.2025.2492357 (ecdysteroid fraction, arthritis models); PMID 40777991, DOI 10.3389/fphar.2025.1619776 (both roots in rheumatoid arthritis); PMID 40729007, PMC 12293607, DOI 10.3390/cimb47070538 (polysaccharides, antioxidant and microbiota); PMID 42280282, PMC 13258527, DOI 10.3390/molecules31111981 (levan-type fructan, wound healing). Research context, not a therapeutic claim.

Chinese Herb Notes

• What is the difference between Chuan Niu Xi and Huai Niu Xi (Niu Xi)?

  They are two different plants sold under one nickname. Chuan Niu Xi is the root of Cyathula officinalis; Huai Niu Xi is the root of Achyranthes bidentata. Both are shortened to “Niu Xi” (Ox Knee), both are bitter, sour and neutral in our records, both enter Liver and Kidney, and both direct downward — but Chuan Niu Xi is the stronger blood-mover and downward-drainer, while Huai Niu Xi is the stronger tonifier of Liver and Kidney and strengthener of sinews and bones. Reading “Niu Xi” in a formula without checking which one is meant is one of the commonest errors in this part of the materia medica.

  • Chuan Niu Xi — Cyathula officinalis, family Amaranthaceae, grown in Sichuan (hence “Chuan”). Emphasis: breaks blood stasis, unblocks the channels, drains damp-heat and fire downward. Choose it when the priority is moving stuck blood or forcing something downward and out.
  • Huai Niu Xi — Achyranthes bidentata, historically from the Huai region (hence “Huai”). Emphasis: tonifies Liver and Kidney, strengthens sinews and bones, alongside a gentler blood-invigorating and downward-guiding action. It is the everyday choice for chronic weak, sore lower back and knees, and the more commonly used of the two.
  • Tu Niu Xi — a third member of the family held in our reference under Radix Achyranthis, categorised quite differently (clearing heat and eliminating toxins) and used for sore throat, blood stasis and Lin patterns. Do not fold it into either of the above.
  • Shared cautions — both are contraindicated in pregnancy, and both carry a caution around excessive menstrual bleeding in our records. The shared caution follows from the shared downward, blood-moving direction.

  Memory hook: Chuan drives, Huai builds. Chuan Niu Xi pushes blood, fire and damp downward; Huai Niu Xi fills the Liver and Kidney and firms the knees.

  Where sources disagree: the classical differentiation above is consistent across the standard materia medica, but a 2025 pharmacological review comparing Achyranthes bidentata and Cyathula officinalis reports that the two share a large number of chemical constituents, show similar pharmacological activities, treat overlapping conditions, and are substituted for one another in some prescriptions — while noting that Cyathula officinalis has been studied far less. Readers should hold both facts: the traditional distinction in emphasis is real and is what is examined, and the modern chemical evidence for a sharp separation between the two roots is weaker than the tradition implies.

  Naming note: our reference record gives the pharmaceutical name as “Radix Cyathula Officinalis.” The form used in the pharmacopoeial and research literature is normally the genitive — Cyathulae Radix or Radix Cyathulae Officinalis. We believe this is the same material; the identity field is left unchanged pending owner confirmation.

  Source: Sacred Lotus identity records for Chuan Niu Xi, Huai Niu Xi and Tu Niu Xi (Latin names, properties, channels, categories, cautions); comparative pharmacology per PMID 40795998, DOI 10.1093/jpp/rgaf059; traditional differentiation per materia medica consensus (Bensky 3rd ed.; Chen & Chen), cross-referenced against multiple online sources.