Elephant's Foot: Fever, Inflammation, and the Human Trial

Fever and inflammation are the most universal traditional indications for Elephant's Foot, recorded independently across Vietnamese, Chinese, Indonesian, Thai and Brazilian folk medicine. Most of this page's evidence — like the rest of this plant's science — is rodent and cell culture. But this is the one benefit area where a real, placebo-controlled human trial exists. It found nothing. That result belongs at the top of this page, not buried under the more flattering laboratory data below it.

Table of Contents

  1. The Human Trial: Ten Volunteers, a Placebo, and a Null Result
  2. The Companion Animal Study, and a Route That Mattered
  3. A Real Contradiction: Two Traditions, Two Solvents, Two Results
  4. The NF-κB Story, Told Once
  5. Macrophage and Cytokine Evidence
  6. The Neuroinflammation Extension
  7. Organ-Specific Inflammation: Lung and Gut
  8. The Teng-Khia-U Papers: A Three-Species Mixture
  9. Soup, Not Just Medicine: The Heat-Stress Tradition
  10. What This Means If You Are Using It for a Fever
  11. Key Research Papers
  12. Connections

The Human Trial: Ten Volunteers, a Placebo, and a Null Result

In 1991 and again in a fuller 1992 report, a São Paulo research group (Laranja, Bergamaschi and Schor) published what appears to be the only controlled human trial ever conducted on this plant, for any indication. Ten healthy volunteers were given a water infusion of Elephantopus scaber — at five times the dose used in Brazilian folk practice, where the plant is traditionally taken to cause diuresis, reduce fever, and help dissolve bladder stones — and compared against a placebo, with a seven-day washout between doses.

The trial measured what it set out to measure carefully: urinary and plasma sodium, potassium, uric acid, calcium, phosphate, urea and creatinine, plus total urine volume and clinical examination. The result was null. Elephantopus scaber produced no significant change in diuresis and no detectable effect on any electrolyte or renal function parameter measured, even at five times the traditional dose. In the same trial, a second plant tested alongside it, Alpinia speciosa, did show a real effect — a modest but statistically significant diuresis and a reduction in both systolic and diastolic blood pressure. The comparison matters: the trial design was sensitive enough to detect a real signal from a different plant tested under identical conditions, and it detected nothing from this one.

This is worth naming precisely: a trial that is adequately designed and controlled, that tests the traditional claim directly, and that fails to find an effect is a negative result — the strongest evidence tier this plant has produced in either direction, stronger than any of the positive rodent or cell-culture findings elsewhere on this page, precisely because it is the only human data that exists.

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The Companion Animal Study, and a Route That Mattered

The same broad Brazilian research tradition produced a detailed 1992 rodent pharmacology paper (Poli et al., Journal of Ethnopharmacology) that is worth walking through in full, because its internal contradictions are more informative than a simple positive or negative headline would be. Aqueous and hydroalcoholic whole-plant extracts were tested for acute toxicity, analgesic, antipyretic, anti-inflammatory, cardiovascular, diuretic and constipating activity in mice and rats. The results, point by point:

The single most load-bearing detail in this entire paper is the antipyretic route-dependence. This plant's most consistent global traditional use is an oral decoction for fever. The one Western pharmacology study that tested oral administration specifically for antipyretic effect found nothing — the effect only appeared when the extract bypassed the gut and liver entirely. That is precisely the kind of route-substitution gap this site's evidence-writing standard treats as decisive rather than incidental: a result obtained by injection does not automatically transfer to the oral route the tradition actually uses, and here, tested head to head in the same paper, it specifically did not.

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A Real Contradiction: Two Traditions, Two Solvents, Two Results

Set the Brazilian findings above against a separate, more recent body of work almost entirely from Chinese and Taiwanese laboratories, and a genuine contradiction appears rather than a simple confirmation. Multiple groups using ethanol or methanol extracts, or sesquiterpene lactones isolated in pure form, have reported clear anti-inflammatory activity: suppression of NF-κB DNA-binding activity in lipopolysaccharide-stimulated macrophages, reduced production of TNF-α and IL-1β in monocytes, and inhibition of both the NF-κB and AP-1 pathways by isodeoxyelephantopin specifically. These are not weak or single-study findings; they are a consistent, mechanistically coherent cluster from independent groups.

This site's evidence-writing standard is to report a genuine contradiction as the finding itself rather than pick the flattering half, so here it is stated plainly: a whole-plant aqueous or hydroalcoholic extract, given orally, showed no anti-inflammatory or antipyretic effect in a rodent model; an ethanol or methanol extract, or an isolated sesquiterpene lactone, shows a clear and repeatedly replicated anti-inflammatory effect in a very similar model. Both are real, published, peer-reviewed findings.

The most likely reconciliation is a solvent-extraction difference rather than a genuine biological contradiction. Deoxyelephantopin and its relatives are lipophilic sesquiterpene lactones; ethanol and methanol extract them efficiently, while a purely aqueous decoction — the traditional preparation in most of this plant's range — extracts them far less efficiently. If the sesquiterpene lactones are the active anti-inflammatory principle, as the mechanism section below argues, then a water-based tea and an ethanol tincture are, in a meaningful pharmacological sense, different interventions carrying different doses of the same molecule — even though both are prepared from the identical dried plant. This is not a confirmed explanation; nobody has run a head-to-head extraction-solvent comparison specifically to test it. It is the most parsimonious account of why two well-conducted studies, on the same plant, reached opposite conclusions.

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The NF-κB Story, Told Once

The main Elephant's Foot page and the cancer research page both explain the underlying chemistry in more depth; the version relevant here is short. Deoxyelephantopin and related sesquiterpene lactones covalently modify a reactive cysteine in the NF-κB activation pathway. NF-κB is the master transcription factor that switches on TNF-α, IL-1β, IL-6, COX-2 and inducible nitric oxide synthase — in short, most of the acute inflammatory response. Blocking it upstream is, mechanistically, a plausible route to an anti-inflammatory and antipyretic effect, and it is the same mechanism responsible for the anticancer activity described on this plant's cancer page. That mechanistic overlap is not a coincidence; it is the reason a single reactive chemical group can plausibly explain such a wide spread of traditional indications for one plant.

It is worth noting, as the Feverfew page on this site does for the closely related compound parthenolide, that a potent NF-κB inhibitor in a dish does not reliably translate into a large clinical effect — feverfew has actual human migraine trial data, of mixed quality, and even there the effect size is modest. That comparison is a useful anchor for how much a laboratory mechanism, however clean, should be expected to matter to an actual patient.

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Macrophage and Cytokine Evidence

The core positive evidence, all in vitro:

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The Neuroinflammation Extension

The same NF-κB mechanism has been tested specifically in brain immune cells. An Elephantopus scaber extract showed anti-neuroinflammatory activity in LPS-activated BV-2 microglia (the brain's resident immune cells) via activation of the Nrf2/HO-1 antioxidant-response pathway and inhibition of p38 MAPK signaling. A separate rat study found that deoxyelephantopin ameliorated lipopolysaccharide-induced memory impairment, again attributed to its anti-neuroinflammatory properties. This is early, narrow evidence — two studies, one compound class, rodent and cell-culture only — but it is mechanistically consistent with everything else on this page, and it is the reason a 2026 review specifically flagged deoxyelephantopin's "neuroprotective" potential alongside its anticancer activity. It has not been tested for any human cognitive or neurological condition.

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Organ-Specific Inflammation: Lung and Gut

Two more recent rodent studies extend the anti-inflammatory story to specific organs beyond the classic paw-edema model:

Both are recent (2024–2026), single-study, rodent-only findings rather than a replicated body of work, and neither has any human data behind it. They are included here because they show the same core mechanism being actively extended to new organ systems by current researchers, which is a reasonable signal of where this compound class's laboratory interest is heading next — not evidence that it treats either condition in a person.

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The Teng-Khia-U Papers: A Three-Species Mixture

A cluster of older Taiwanese pharmacology papers tests something called "Teng-Khia-U," a named folk medicine. It would be easy to read these as straightforward Elephantopus scaber evidence — the papers themselves clearly state, and this page confirms after reading the original text rather than assuming, that "Teng-Khia-U" is explicitly defined by its own authors as a preparation derived from the entire plants of three species together: Elephantopus scaber L., E. mollis H.B.K., and Pseudoelephantopus spicatus (Juss.) Rohr. A 1999 paper in this series found that Teng-Khia-U significantly inhibited both carrageenan-induced acute arthritis and complete Freund's-adjuvant-induced chronic arthritis in rats.

That is a real, positive, peer-reviewed anti-inflammatory finding — for a three-species mixture, not for this plant alone. Crediting it to Elephantopus scaber specifically would be exactly the kind of formula-substitution error this site's evidence standard is written to catch: the result may derive from any one of the three plants, from their combination, or from a shared class of compounds all three happen to contain (which is plausible, since E. mollis and Pseudoelephantopus both carry related sesquiterpene lactones). One companion paper from the same research program did test the three species separately against CCl4-induced liver injury (see the hepatoprotective page) and found all three individually active to varying degrees — which supports treating the class as broadly active, while still not licensing "Teng-Khia-U's arthritis result" as a clean, single-species finding for E. scaber alone.

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Soup, Not Just Medicine: The Heat-Stress Tradition

A 2024 study (Wang et al., Nutrients) opens with a detail worth recording for its own sake: in southern China, this plant is used "both as a food and medicine," commonly added to soups in summer specifically to relieve heat stress. The study tested polysaccharides extracted from the plant (a different constituent class from the sesquiterpene lactones that dominate the rest of this page) in heat-stressed mice, and found the low dose (150 mg/kg/day) more effective than higher doses (300 and 450 mg/kg/day) at reducing inflammatory cytokines (TNF-α, IL-1β, IL-6) and improving gut-barrier tight-junction protein expression, apparently by favorably reshaping gut microbiota composition.

Two things are worth taking from this small study without overreading it. First, it is a genuine piece of ethnobotanical color: this is not only a medicine taken for acute illness but an everyday cooling food in parts of its range, which fits the "clear heat" framing recorded in Chinese herbal tradition more broadly. Second, the non-monotonic dose-response — low dose outperforming higher doses — is a real finding worth flagging on its own terms, because it complicates any assumption that a stronger preparation is automatically a better one. It has not been replicated, and it used purified polysaccharide extract rather than a bowl of soup.

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What This Means If You Are Using It for a Fever

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Key Research Papers

  1. Laranja SM, Bergamaschi CM, Schor N. Evaluation of acute administration of natural products with potential diuretic effects, in humans (1991). Memorias do Instituto Oswaldo Cruz. — Find on PubMed. The negative human trial discussed above.
  2. Laranja SM, Bergamaschi CM, Schor N. [Evaluation of three plants with potential diuretic effect] (1992, Portuguese). Revista da Associação Médica Brasileira. — Find on PubMed. The fuller companion report of the same trial.
  3. Poli A, Nicolau M, Simoes CM, Nicolau RM, Zanin M. Preliminary pharmacologic evaluation of crude whole plant extracts of Elephantopus scaber. Part I: In vivo studies (1992). Journal of Ethnopharmacology. — Find on PubMed. The route-dependent antipyretic finding and the null carrageenan/analgesic results.
  4. Qi R, Li X, Zhang X, et al. Ethanol extract of Elephantopus scaber Linn. attenuates inflammatory response via the inhibition of NF-κB signaling by dampening p65-DNA binding activity in lipopolysaccharide-activated macrophages (2020). Journal of Ethnopharmacology. — Find on PubMed
  5. Han Y, Li X, Zhang X, et al. Isodeoxyelephantopin, a sesquiterpene lactone from Elephantopus scaber Linn., inhibits pro-inflammatory mediators' production through both NF-κB and AP-1 pathways in LPS-activated macrophages (2020). International Immunopharmacology. — Find on PubMed
  6. Abhimannue AP, Mohan MC, B PK. Inhibition of Tumor Necrosis Factor-α and Interleukin-1β Production in Lipopolysaccharide-Stimulated Monocytes by Methanolic Extract of Elephantopus scaber Linn (2016). Applied Biochemistry and Biotechnology. — Find on PubMed
  7. Chan CK, Tan LT, Andy SN, et al. Anti-neuroinflammatory Activity of Elephantopus scaber L. via Activation of Nrf2/HO-1 Signaling and Inhibition of p38 MAPK Pathway in LPS-Induced Microglia BV-2 Cells (2017). Frontiers in Pharmacology. — Find on PubMed
  8. Andy SN, Pandy V, Alias Z, et al. Deoxyelephantopin ameliorates lipopolysaccharides (LPS)-induced memory impairments in rats: Evidence for its anti-neuroinflammatory properties (2018). Life Sciences. — Find on PubMed
  9. Wang C, Sun D, Deng Q, et al. Elephantopus scaber L. Polysaccharides Alleviate Heat Stress-Induced Systemic Inflammation in Mice via Modulation of Characteristic Gut Microbiota and Metabolites (2024). Nutrients. — Find on PubMed. The traditional food/soup use and non-monotonic dose-response discussed above.
  10. Lin LY, Li HZ, Liu XQ, et al. Isodeoxyelephantopin mitigates DSS-induced ulcerative colitis by suppressing IL-1β-driven inflammation via the TXNIP/NLRP3 axis (2026). Phytomedicine. — Find on PubMed
  11. Tsai CC, Lin CC. Anti-inflammatory effects of Taiwan folk medicine "Teng-Khia-U" on carrageenan- and adjuvant-induced paw edema in rats (1999). Journal of Ethnopharmacology. — Find on PubMed. Read the abstract yourself: it explicitly names all three source species. See the discussion above.
  12. Jia C, Yang M, Xiao G, et al. ESL attenuates BLM-induced IPF in mice: Dual mediation of the TLR4/NF-κB and TGF-β1/PI3K/Akt/FOXO3a pathways (2024). Phytomedicine. — Find on PubMed

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Connections

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