Fang Feng (Ledebouriella Root)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Fang Feng?

  Roughly 3–9 grams of the dried root in decoction — the standard range in the Sacred Lotus and in materia medica references generally.

  In multi-herb formulas the proportion shifts with the pattern: in Yu Ping Feng San (Jade Windscreen Powder), Fang Feng is used in a smaller ratio than the two chief herbs — classically about Huang Qi 60–180 g : Bai Zhu 60 g : Fang Feng 60 g when prepared as a ground powder taken in small doses per use, reflecting its role there as an assistant that guides the tonics to the exterior rather than a stand-alone dose. (Formula-context reference, not a self-dosing instruction.)

  Source: Sacred Lotus (dosage range; Yu Ping Feng San ingredient links). Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Fang Feng?

  Fang Feng should be used cautiously in Yin- and Blood-deficiency patterns where spasm or heat signs are present, since its warm, dispersing nature is not suited to nourishing a deficient, heat-prone constitution; it is also traditionally avoided in cases of internal wind such as Parkinson’s-disease-type tremor, where an externally-directed wind herb is not the appropriate strategy.

  • Yin/Blood deficiency with spasm or heat — use cautiously; not a substitute for yin/blood-nourishing or internal-wind-extinguishing herbs.
  • Internal wind (e.g., Parkinson’s-disease-type presentations) — use with caution, per Sacred Lotus reference notes.
  • Classical incompatibilities — traditional materia medica records list Fang Feng as traditionally not combined with Rhizoma Zingiberis Officinalis (Gan Jiang, dry ginger), Rhizoma et Radix Veratri (Li Lu), and Rhizoma Dioscoreae Hypoglaucae (Bei Xie).

  Source: Sacred Lotus legacy reference content (cautions and classical incompatibilities), consistent with standard release-the-exterior category cautions in materia medica consensus.

Chinese Herb Toxicity & Overdose

• Low. A 2019 oral toxicology study of Saposhnikoviae Radix (Fang Feng) water extract in rats found no significant acute, 4-week range-finding, or 13-week subchronic toxicity across mortality, clinical signs, body/organ weight, blood chemistry, hematology, urinalysis, and histopathology endpoints, setting the no-observed-adverse-effect level (NOAEL) at 5,000 mg/kg/day — a wide margin above typical TCM decoction doses. This is an animal/preclinical finding, not a clinical safety guarantee, and it is consistent with Fang Feng not being flagged as a toxic or endangered herb in this database.

  Source: PMID 31636848, DOI 10.5487/TR.2019.35.4.371 (oral acute/subchronic toxicology study). Reference note, not a safety guarantee.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Fang Feng. Network-pharmacology and in-vitro work (below) shows Fang Feng and its chromone constituents inhibit IgE-mediated mast-cell degranulation and modulate inflammatory signaling pathways, so practitioner awareness is reasonable for patients on antihistamines, other allergy medications, or immunomodulating drugs — this is a precautionary, mechanism-based consideration, not a demonstrated clinical interaction. (Flagged for practitioner confirmation.)

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 Fang Feng (Saposhnikovia divaricata)?

  Yes — mechanistic/preclinical research on the herb itself, plus clinical meta-analyses of its signature formula, Yu Ping Feng San. Fang Feng’s characteristic constituents are chromones (e.g., cimifugin, prim-O-glucosylcimifugin), coumarins, and polyacetylenes, and most single-herb research is laboratory-based rather than human trials of Fang Feng alone.

  • Anti-allergic mechanism (preclinical/in-vitro) — a network-pharmacology study identified compounds from Fang Feng targeting allergy-related genes via calcium-signaling, PI3K-Akt, and MAPK pathways, and confirmed in vitro that both a Fang Feng decoction and its constituent prim-O-glucosylcimifugin inhibited IgE-triggered mast-cell degranulation, reducing β-hexosaminidase release more than the comparator antihistamine drug at higher concentrations (PMID 35760567, PMC 9246231, DOI 10.1080/13880209.2022.2086583).
  • Anti-inflammatory / joint-pain mechanism (preclinical, animal) — a chromone extract of Fang Feng suppressed inflammation in a collagen-induced rheumatoid-arthritis rat model via inhibition of NF-κB and MAPK signaling, offering a mechanistic angle on its traditional use for wind-damp painful obstruction (PMID 23711830, DOI 10.1016/j.jep.2013.05.023).
  • Yu Ping Feng San for allergic rhinitis (clinical, formula-level) — a systematic review and meta-analysis of randomized controlled trials found Yu Ping Feng San (Fang Feng with Huang Qi and Bai Zhu) improved symptoms and/or reduced relapse in pediatric allergic rhinitis versus comparators, though trial quality was mixed and this evidence concerns the multi-herb formula, not Fang Feng alone (PMID 33787571, PMC 8021384, DOI 10.1097/MD.0000000000024534).

  Overall: laboratory evidence for Fang Feng’s anti-allergic and anti-inflammatory mechanisms is building, and its formula Yu Ping Feng San has real (if mixed-quality) clinical trial support; direct human trials of Fang Feng as a single herb are still lacking.

  Sources: PMID 35760567, PMC 9246231, DOI 10.1080/13880209.2022.2086583; PMID 23711830, DOI 10.1016/j.jep.2013.05.023; PMID 33787571, PMC 8021384, DOI 10.1097/MD.0000000000024534. Research context, not a therapeutic claim.

Chinese Herb Notes

• Is Fang Feng the same herb as “Ledebouriella,” and why does the Latin name differ?

  Yes — Fang Feng is the root of one single species, now classified as Saposhnikovia divaricata, with “Ledebouriella” (the genus used in our Latin name, Radix Ledebouriellae Divaricatae) as an older, still widely used synonym. The plant has been reclassified across several genera over its taxonomic history (including Stenocoelium and Ledebouriella) before settling in the monotypic genus Saposhnikovia; both names refer to the same TCM herb, and English-language and older TCM references frequently still use “Ledebouriella.”

  Note: our Latin field uses the older genus “Ledebouriellae”; current botanical taxonomy (Plants of the World Online / Kew) accepts Saposhnikovia divaricata as the valid name, with Ledebouriella divaricata/seseloides listed as synonyms. Left as-is pending owner confirmation, since both names identify the same herb and changing it is a data-identity decision.

  What does Fang Feng combine with, and what is its role in Yu Ping Feng San?

  Fang Feng’s signature combination is with Huang Qi and Bai Zhu in Yu Ping Feng San (Jade Windscreen Powder) — a formula for Wei (defensive) qi deficiency with an unstable, weak exterior: spontaneous sweating, frequent colds, aversion to wind, fatigue, and a pale, shiny complexion. There, Huang Qi and Bai Zhu tonify and consolidate the Wei qi while Fang Feng, though warm and dispersing, is chosen because its mild, non-drying release-the-exterior action guides the tonics outward without opening the exterior enough to cause further sweating or invite new wind — the classic “tonify while dispersing” pairing.

  Beyond Yu Ping Feng San, the Sacred Lotus formula database links Fang Feng into 14 formulas, including: Chuan Xiong Cha Tiao San (wind-invasion headache), Qiang Huo Sheng Shi Tang and Du Huo Ji Sheng Tang (wind-damp Bi/painful obstruction), Tong Xie Yao Fang (Liver-Spleen disharmony diarrhea, with Bai Zhu and Bai Shao), Xiao Feng San (wind-heat/wind-damp skin rash), Fang Feng Tong Sheng San (combined exterior wind-heat and interior excess heat), Yu Zhen San (wind from incised wounds/tetanus), Jiu Wei Qiang Huo Tang and Gui Zhi Shao Yao Zhi Mu Tang (wind-cold-damp exterior patterns), Xian Fang Huo Ming Yin (early-stage sores/abscess), Xie Huang San (Spleen channel latent heat), Zai Zao San, and Xiao Xu Ming Tang. (Traditional formula context, not treatment advice.)

  Source: taxonomy — Plants of the World Online (Kew Science); synonymy commonly noted across TCM pharmacognosy literature. Combinations — Sacred Lotus ingredient links Sacred Lotus; formula patterns per Sacred Lotus formula records.