Da Feng Zi (Chaulmoogra Seeds)

Chinese Herb Actions

Chinese Herb Contraindications & Cautions

• What are the cautions associated with Da Feng Zi (Chaulmoogra Seed)?

  Da Feng Zi is classified as toxic in Chinese materia medica, which is the documented reason its use is confined almost entirely to external (topical) application. Historical accounts of internal/oral use describe pronounced gastrointestinal intolerance, and Chinese materia medica sources contraindicate it in pregnancy and in patients with an underlying deficiency pattern or weak constitution — the general caution attached to toxic, externally-applied substances in this category.

  • Pregnancy — contraindicated, consistent with the standard materia medica caution for toxic substances in this category.
  • Deficiency / weak constitution — not indicated for blood- or qi-deficient presentations; its “kill parasites, resolve toxicity” action targets excess, toxic-pathogen patterns, not deficiency.
  • Route of administration (reference note) — historically and in current practice, use is confined to the skin; documented toxicity with internal/oral exposure is why it is not taken internally (see Toxicity).

  Source: Chinese materia medica consensus for toxic, externally-applied substances; Sacred Lotus herb identity record (category “Substances for External Application”; properties flagged “Toxic”). Reference note, not usage instruction.

Chinese Herb Toxicity & Overdose

• Toxic — the Sacred Lotus identity record and standard Chinese materia medica both classify Da Feng Zi as a toxic substance, which is the documented public-safety basis for restricting it to external (skin) application. Historical clinical literature on chaulmoogra-derived preparations (the same plant chemistry, studied in the parallel Western leprosy-treatment tradition) documents that oral/internal administration caused pronounced gastrointestinal intolerance — nausea, vomiting, abdominal discomfort — severe enough that early-20th-century physicians largely abandoned oral dosing of chaulmoogra oil in favor of injectable ester preparations, and injection carried its own local-reaction and systemic-toxicity concerns.

  Note on evidence quality: broader toxicology/pharmacognosy reference literature also describes hepatic stress and hematologic effects, including hemolysis, associated with excessive or internal exposure to chaulmoogra oil and its fatty-acid derivatives — consistent with the Chinese materia medica’s own traditional caution that Da Feng Zi, taken internally, can injure the blood. Dedicated modern peer-reviewed pharmacology specifically quantifying hepatic and hemolytic risk is sparse (most primary literature on internal use is early-to-mid-20th-century clinical/historical rather than contemporary mechanistic study); we keep this note because it is corroborated across independent historical-clinical and toxicology reference sources and aligns with the herb’s own toxic classification, while flagging that it is not a single-study finding.

  Taken together, these documented risks are the reason Da Feng Zi is restricted to external application in both historical Chinese practice and the present day; internal use of chaulmoogra-derived compounds for disease treatment is obsolete, having been superseded by dapsone and other sulfone drugs as the medical standard for leprosy since the 1940s.

  Source: PMID 12894769 (Parascandola, chaulmoogra oil and leprosy treatment history, Pharm Hist 2003); PMID 8089304 (Norton, “Useful plants of dermatology: Hydnocarpus and chaulmoogra,” J Am Acad Dermatol 1994); PMID 7673965 (Haas, J Neurol Neurosurg Psychiatry 1995); PMID 19241672 (dos Santos et al., Hist Ciênc Saúde Manguinhos 2008); Chinese materia medica toxic-substance classification. Reference note, not a safety guarantee.

• This herb is considered toxic.
  (while some Chinese herbs are toxic, it must be noted that many come prepared, or are combined, to mitigate their toxicity)

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Da Feng Zi. Therapeutic use of chaulmoogra-derived compounds for disease treatment was superseded in the 1940s by dapsone and other sulfone antibiotics as the medical standard for leprosy (Hansen’s disease), so contemporary clinical pharmacology and interaction data for chaulmoogra/Hydnocarpus preparations are essentially absent from the modern literature. Given documented hepatic-stress and hematologic (hemolytic) toxicity concerns with internal exposure (see Toxicity), theoretical caution alongside other hepatotoxic or hemolysis-associated agents would be reasonable if internal exposure ever occurred — this is a mechanism-based inference, 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 Da Feng Zi / chaulmoogra (Hydnocarpus spp.)?

  Yes — chaulmoogra’s research record is unusual among Chinese materia medica substances because it is the documented chemical and historical basis of a real pre-antibiotic-era medical therapy, not solely a traditional-use record. The seed oil is chemically dominated by chaulmoogric acid and hydnocarpic acid, unusual cyclopentenyl (cyclic-ring) fatty acids that are the compounds responsible for its documented antimicrobial activity.

  • Historical leprosy therapy. From its introduction to Western medicine in 1854 through the 1940s, chaulmoogra oil and its salts/esters were the principal available treatment for leprosy worldwide — given orally, by injection, or applied topically — before sulfone drugs (chiefly dapsone) replaced it as the therapeutic standard.
  • Activity against Mycobacterium leprae (1975). In a mouse-footpad infection model, crude sodium salts of chaulmoogra fatty acids and purified chaulmoogric acid inhibited multiplication of M. leprae, while related hydnocarpic acid and palmitic acid showed little or no activity at the doses tested — laboratory confirmation, decades after clinical use began, of the traditional therapy’s biological plausibility.
  • Phytochemical/pharmacological review (2014). A review of the genus Hydnocarpus catalogs cyclopentenyl fatty acids and flavonolignans (including hydnocarpin) in the seeds, with documented antibacterial, antileprotic, antitubercular, antipsoriatic, antirheumatic, hypolipidemic, antidiabetic, anti-inflammatory, and antioxidant activities across preclinical studies.
  • Contemporary laboratory research (2024). An in vitro/in silico study of Hydnocarpus wightianus seed extract reported activity against antibiotic-resistant Staphylococcus aureus (MRSA) plus antioxidant and antidiabetic effects in laboratory assays, with molecular-docking analysis of candidate compounds — preliminary laboratory research, not a treatment protocol.

  Bottom line: chaulmoogra’s traditional Chinese use and 20th-century Western medicine briefly converged on the same disease (leprosy) via related plant chemistry. Today it survives clinically only as medical history — dapsone-based multidrug therapy is the modern standard for leprosy — while laboratory interest in Hydnocarpus phytochemistry continues on unrelated fronts (antimicrobial, metabolic, antioxidant research).

  Sources: PMID 12894769 (Parascandola, Pharm Hist 2003); PMID 19241672 (dos Santos et al., Hist Ciênc Saúde Manguinhos 2008); PMID 1093460 (Levy, Am Rev Respir Dis 1975); PMID 24732111 / DOI 10.1016/j.jep.2014.03.029 (Sahoo et al., J Ethnopharmacol 2014); PMID 39025383 / DOI 10.1016/j.micpath.2024.106798 (Kathiresan et al., Microb Pathog 2024); PMID 8089304 (Norton, J Am Acad Dermatol 1994); PMID 7673965 (Haas, J Neurol Neurosurg Psychiatry 1995); PMID 4738011 (Chaudhuri & Ghosh, Indian J Dermatol 1973). Research/historical context, not a therapeutic claim.

Chinese Herb Notes

• What plant does Da Feng Zi come from, and how does it relate to “chaulmoogra oil”?

  Da Feng Zi is the dried seed of the chaulmoogra tree, genus Hydnocarpus (family Achariaceae, formerly placed in Flacourtiaceae) — Chinese materia medica records the source as Hydnocarpus anthelmintica (also spelled H. anthelminthica), while the closely related Indian species H. wightiana supplied the “chaulmoogra oil” used in Ayurvedic medicine and, later, in Western pre-antibiotic-era medicine for leprosy. Both are seed sources of the same class of chaulmoogric/hydnocarpic fatty-acid oil, and both traditions applied them, independently, against the same disease group.

  Historical parallel: the Chinese use of Da Feng Zi for leprosy long predates, and runs parallel to, the separate “chaulmoogra oil era” of Western leprosy medicine (introduced to Western practice in 1854; the leading available treatment worldwide from the 1910s–1920s until it was superseded by sulfone drugs, chiefly dapsone, in the 1940s). The two traditions converged on related plant chemistry from different starting points.

  Note: species names for “chaulmoogra” are used inconsistently across sources — H. anthelmintica, H. kurzii, and H. wightiana are all called “chaulmoogra” in different texts, and older literature does not always distinguish them precisely. We treat this as a shared common name for closely related Hydnocarpus seed-oil sources rather than a single fixed botanical identity; our existing Latin identity (Semen Hydnocarpi Anthelminticae) is left unchanged.

  Source: Sacred Lotus herb identity record; standard Chinese materia medica references; Parascandola, Pharm Hist 2003 (PMID 12894769); dos Santos et al., Hist Ciênc Saúde Manguinhos 2008 (PMID 19241672).

This herb is considered toxic