Boneset — Benefits Deep Dive

Boneset (Eupatorium perfoliatum) is a tall white-flowered composite of North American wet meadows and ditches, and for roughly two centuries it was one of the most widely used domestic fever remedies on the continent. Native American nations used it, colonists learned it from them, the nineteenth-century Eclectic physicians wrote it up at length, and it held official status in the American drug literature of the period. Four pages here take that story apart: what the plant's misleading name actually refers to, what the historical record does and does not establish, what the modern laboratory work found, and why the plant's alkaloid content is the single best-supported fact about it.

Read the safety article before anything else on this site persuades you to try it. Boneset contains dehydro-pyrrolizidine alkaloids — the 1,2-unsaturated subclass whose human liver toxicity is established, whose damage is cumulative and delayed, and which is genotoxic in animal studies. Reported levels in the plant are low, and this site does not claim a cup of correctly identified boneset tea during a single feverish illness is dangerous. What the mechanism does rule out is habitual, repeated or long-term use, and it rules it out absolutely in pregnancy, while breastfeeding, in infants and children, and in anyone with liver disease. There is also a genuinely poisonous look-alike, white snakeroot, sharing boneset's range, season and flower colour.

And here is the honest headline for the benefits side: there is no adequate controlled human trial of boneset for fever, influenza, or any other indication. Not a negative trial — an absent one. What exists is a deep documentary tradition and a small, mostly in-vitro modern literature. That asymmetry — established harm mechanism, absent benefit evidence — is the finding these pages report, and it is stated up front rather than buried under the history.

Table of Contents

1. Deep-Dive Articles
2. Boneset’s Evidence at a Glance
3. How to Read an Evidence Tier
4. The Name Problem, in One Paragraph
5. Key Research: The Name, Fever and Dengue History
6. Key Research: Traditional and Eclectic Use
7. Key Research: Chemistry and Constituents
8. Key Research: Immune, Antiviral and Anti-Inflammatory Work
9. Key Research: Pyrrolizidine Alkaloids and Liver Safety
10. Four Kinds of Borrowed Evidence to Watch For
11. External Resources
12. Connections

Deep-Dive Articles

Boneset’s Evidence at a Glance

Ordered by how well established each statement is, not by how interesting it is. Read top to bottom and notice that everything in the upper half is chemistry or harm.

• 1,2-unsaturated pyrrolizidine alkaloids cause hepatic sinusoidal obstruction syndrome in humans. Tier: established — human, mechanism characterised at the molecular level, poisoning outbreaks and case series documented.
• That alkaloid subclass is genotoxic and carcinogenic in animal studies. Tier: established in animals; human cancer attribution by inference and modelling, not direct epidemiology.
• Boneset’s constituent profile is characterised — sesquiterpene lactones, flavonoids, caffeic acid derivatives, polysaccharides. Tier: established analytical chemistry, multiple papers.
• Dehydro-pyrrolizidine alkaloids have been detected in Eupatorium perfoliatum. Tier: analytically demonstrated; small number of studies; quantity across commercial product not surveyed.
• Boneset is emetic and cathartic in large doses. Tier: consistent, unanimous traditional clinical observation across two centuries.
• Boneset extracts have anti-inflammatory activity. Tier: in vitro, cell models, replicated within one research group.
• A boneset extract interferes with influenza A virus attachment. Tier: single in-vitro study; hydroalcoholic extract, not an infusion; no animal or human follow-up.
• Boneset polysaccharides activate immune cells. Tier: in vitro; the classic study covered two species jointly; large polysaccharides are not appreciably absorbed orally.
• Boneset relieves fever and shortens influenza in people. Tier: tradition only — no controlled human trial exists.
• Boneset stimulates appetite as a bitter tonic. Tier: tradition; human bitter-receptor physiology points the opposite way.
• Boneset has “no known drug interactions.” Tier: not a finding — no interaction study has ever been performed. Absent data, not reassurance.
• Boneset sets, heals or strengthens bones. Tier: none. No traditional claim, no mechanism, no research. The name is a misreading.

How to Read an Evidence Tier

The tier labels above are doing real work, so it is worth being explicit about what each one licenses.

• Established, human. Demonstrated in people, with a mechanism, and reproduced. This is the only tier that supports a confident statement about what will happen to a person. On boneset, the statements at this tier are about the alkaloid class.
• Established in animals. Real, reproducible, and relevant — but species differ in metabolism, and exposures in animal studies are often far above human dietary levels. Sufficient to establish a mechanism exists; insufficient to quantify human risk.
• In vitro. Cells or enzymes in a dish at a controlled concentration. Establishes that a chemical interaction is possible. Says nothing about whether the concentration is reachable in a person, which usually requires pharmacokinetic data that does not exist for this plant.
• Traditional. Documented long-standing use. Tells you what people did and believed. Cannot distinguish a remedy working from a self-limiting illness resolving, because pre-statistical observation had no way to. Boneset's tradition is unusually well documented and it is still this tier.
• Absent. The study has not been done. This is a result, not a gap in this page's reading — and it is not the same as a negative result. “No trial exists” and “trials found no effect” are different epistemic states, and conflating them is sloppy in both directions.

One more translation, because it is the phrase most often misread on herb pages: “no reported cases of harm” is a statement about surveillance, not about safety. Boneset is a commercially minor herb, used intermittently, mostly as loose dried material, by people who do not report it to their doctors and whose potential injury would present months later with no obvious cause. That is close to the ideal conditions for genuine harm to go uncounted. Where the harm mechanism is established and the surveillance is absent, the asymmetry of consequences favours caution even with nothing documented.

The Name Problem, in One Paragraph

It is worth stating once at the top of the set, because it is the single most common error about this plant and it is not a harmless one. Boneset was never a fracture remedy. The name compresses “the herb for break-bone fever” — the old popular name for illnesses, dengue most famously and severe influenza most commonly, that produce a deep boring ache in the long bones and back. Every other historical name the plant carries says the same thing: feverwort, agueweed, sweating-plant. The reason this matters beyond etymology: a reader who believes boneset is for bones will reach for it for a chronic musculoskeletal complaint, taken daily over months — which is precisely the exposure pattern the plant's alkaloid content most argues against, for an indication it has no claim to at all. A common name can imply a use, and a safety profile, that a plant does not have. Full treatment in Boneset for Fever and Influenza, and Where the Name Comes From.

Key Research: The Name, Fever and Dengue History

All citations across this hub are given as PubMed topic searches rather than fixed record links, so that they keep working and so that a reader sees the literature on a question rather than one paper's framing.

1. Gubler DJ. “Dengue and dengue hemorrhagic fever.” Clinical Microbiology Reviews, 1998. The standard review; the source for dengue's historical naming and the early described American outbreaks. Find on PubMed.
2. Historical nomenclature of dengue. The literature on early American febrile epidemics and the origin of “break-bone” and “dandy” fever as popular names for the same illness. Search PubMed.
3. Evans SS, Repasky EA, Fisher DT. “Fever and the thermal regulation of immunity: the immune system feels the heat.” Nature Reviews Immunology, 2015. Why the febrile range is immunologically active rather than incidental — the reason suppressing a fever is not automatically the goal. Find on PubMed.
4. Kluger MJ. “Fever: role of pyrogens and cryogens.” Physiological Reviews, 1991. The classic synthesis of fever as a regulated, conserved response rather than a malfunction. Find on PubMed.
5. Young P, Saxena M, Bellomo R, and colleagues. Acetaminophen for fever in critically ill patients with suspected infection. New England Journal of Medicine, 2015. A large randomised test of routine antipyresis that did not find the expected benefit. Find on PubMed.
6. Sullivan JE, Farrar HC; American Academy of Pediatrics. “Fever and antipyretic use in children.” Pediatrics, 2011. The clinical report that reframes the goal as comfort rather than a number on a thermometer. Find on PubMed.

Key Research: Traditional and Eclectic Use

1. Hensel A, Maas M, Sendker J, and colleagues. “Eupatorium perfoliatum L.: phytochemistry, traditional use and current applications.” Journal of Ethnopharmacology, 2011. The single most useful modern reference on this plant, covering both the traditional record and the chemistry, and unusually candid about how thin the clinical evidence is. Find on PubMed.
2. Moerman DE. Analyses of the food and drug plants of native North America. Journal of Ethnopharmacology. The quantitative framework behind most statements about which plants were used by which nations for what. Find on PubMed.
3. Nineteenth-century clinical accounts of Eupatorium perfoliatum in epidemic influenza. Reports of this kind exist in the mid-nineteenth-century American journal literature and are cited in the modern reviews. Uncontrolled case series by modern standards; primary metadata not independently verified here. Search PubMed.
4. Gassinger CA, Wünstel G, Netter P. Controlled clinical trial of homoeopathic Eupatorium perfoliatum D2 in common cold. Arzneimittel-Forschung, 1981 (in German). Borrowed evidence: a homeopathic dilution is not the herb, and this study cannot be credited to boneset's pharmacology in either direction. It is also the main reason a naive search appears to turn up human evidence. Find on PubMed.
5. Human bitter taste receptor studies and appetite. The literature in which bitter agonists given to volunteers reduce appetite and calorie intake and slow gastric emptying — a direct challenge to the traditional bitter-tonic rationale, and an unresolved contradiction rather than a settled refutation. Search PubMed.

Key Research: Chemistry and Constituents

1. Herz W and colleagues. Sesquiterpene lactones of Eupatorium perfoliatum. Journal of Organic Chemistry, 1977. The foundational isolation work that named euperfolin and euperfolitin after the plant. Find on PubMed.
2. Maas M, Hensel A, Schmidt TJ, and colleagues. An unusual dimeric guaianolide with antiprotozoal activity and further sesquiterpene lactones from Eupatorium perfoliatum. Phytochemistry, 2011. Structure elucidation with an attached parasite screen — a screening exercise, not a therapeutic programme. Find on PubMed.
3. Maas M, Petereit F, Hensel A. Caffeic acid derivatives from Eupatorium perfoliatum. Molecules, 2009. The polar phenolic fraction — the constituents a hot water infusion most plausibly delivers. Find on PubMed.
4. Sesquiterpene lactones as thiol-reactive electrophiles and NF-κB inhibitors. The mechanistic literature explaining why one chemical property underlies the anti-inflammatory activity, the cytotoxicity and the contact allergy — benefit and hazard described twice. Search PubMed.
5. Taxonomic revision of Eupatorium and the segregate genera Eutrochium and Ageratina. Why an older source's “Eupatorium” may not be the plant a modern reader expects — an identification problem, not a filing problem. Search PubMed.

Key Research: Immune, Antiviral and Anti-Inflammatory Work

1. Derksen A, Kühn J, Hafezi W, and colleagues. “Antiviral activity of hydroalcoholic extract from Eupatorium perfoliatum L. against the attachment of influenza A virus.” Journal of Ethnopharmacology, 2016. The plant's most-cited modern result. In vitro; a hydroalcoholic extract, not an infusion; no animal or human follow-up. Find on PubMed.
2. Maas M, Deters AM, Hensel A. Anti-inflammatory activity of Eupatorium perfoliatum extracts, eupafolin and a dimeric guaianolide via inducible nitric oxide synthase inhibition and modulation of inflammation-related cytokines. Journal of Ethnopharmacology, 2011. The best-replicated pharmacological signal on the plant — and coherent with the traditional indication. Find on PubMed.
3. Vollmar A, Schäfer W, Wagner H. Immunologically active polysaccharides of Eupatorium cannabinum and Eupatorium perfoliatum. Phytochemistry, 1986. Species substitution warning: a two-species study routinely cited as though it were boneset-only. Find on PubMed.
4. Habtemariam S, Macpherson AM. Cytotoxicity and antibacterial activity of an ethanol extract from leaves of the herbal drug boneset. Phytotherapy Research, 2000. Read the cytotoxicity half of that title as carefully as the antibacterial half; selectivity is the whole story. Find on PubMed.
5. Eupafolin (nepetin) pharmacology. A substantial literature on this flavone, almost all of it conducted with material from plants other than boneset — the clearest compound-substitution trap in this set. Search PubMed.
6. Oral bioavailability of dietary polyphenols and plant polysaccharides. Why the dish-to-cup arithmetic comes out three or four orders of magnitude short, and where the local-action caveat comes from. Search PubMed.
7. Herbal interventions for acute respiratory infection that do have randomised human data — elderberry, Pelargonium sidoides, Andrographis, echinacea. The comparator set, which pre-empts the objection that traditional herbs are simply never trialled. Search PubMed.

Key Research: Pyrrolizidine Alkaloids and Liver Safety

No specific alkaloid content figure, exposure threshold or dose is asserted anywhere in this set. The published analyses on boneset are few, biological variability across PA-bearing plants is large, and regulatory limits differ by jurisdiction, category and date. A confident number here would be a guess dressed up as a fact, and readers who need one should consult a current primary regulatory source.

1. Fu PP, Xia Q, Lin G, Chou MW. Pyrrolizidine alkaloids — genotoxicity, metabolism enzymes, metabolic activation and mechanisms. Drug Metabolism Reviews, 2004. The standard account of how the liver converts these alkaloids into the reactive species that damages it. Find on PubMed.
2. Ruan J, Yang M, Fu P, Ye Y, Lin G. Metabolic activation of pyrrolizidine alkaloids: the structural and enzymatic basis. Chemical Research in Toxicology, 2014. Why the 1,2-unsaturated structure is the one that matters and saturated PAs are comparatively benign. Find on PubMed.
3. Edgar JA, Molyneux RJ, Colegate SM. Pyrrolizidine alkaloids: potential role in the aetiology of cancers and other chronic disease. Chemical Research in Toxicology, 2015. The case for taking chronic low-level dietary exposure seriously. Find on PubMed.
4. Dehydropyrrolizidine alkaloids in boneset and related species. Analytical detection in E. perfoliatum by Betz, Colegate, Upton, Gardner and colleagues — the boneset-specific finding on which this whole caution rests. Search PubMed.
5. Chen Z, Huo JR. Hepatic veno-occlusive disease associated with toxicity of pyrrolizidine alkaloids in herbal preparations. Netherlands Journal of Medicine, 2010. Human injury arising specifically from herbal use rather than contaminated food. Find on PubMed.
6. Lin G and colleagues. Hepatic sinusoidal obstruction syndrome associated with consumption of Gynura segetum. Journal of Hepatology, 2011. A large, well-characterised human series from medicinal-plant PA exposure. Find on PubMed.
7. DeLeve LD, Shulman HM, McDonald GB. Toxic injury to hepatic sinusoids: sinusoidal obstruction syndrome. Seminars in Liver Disease, 2002. The pathophysiology of the lesion — why the presentation is ascites and painful hepatomegaly rather than a transaminase spike. Find on PubMed.
8. Prakash AS, Pereira TN, Reilly PE, Seawright AA. Pyrrolizidine alkaloids in human diet. Mutation Research, 1999. Exposure routes including herbal teas, honey and contaminated grain. Find on PubMed.
9. Roeder E. Medicinal plants containing pyrrolizidine alkaloids. Die Pharmazie, 1995. The inventory to check before stacking herbs — exposures from separate products add up, and a reader tracking each one individually will underestimate the total. Find on PubMed.
10. Pyrrolizidine alkaloids in herbal teas and herbal drugs: analytical surveys. Measured content in retail herbal products is variable and frequently unexpected, which is why unverified material is the core practical problem. Search PubMed.
11. Transplacental and lactational transfer of pyrrolizidine alkaloids. The basis for treating pregnancy and breastfeeding as absolute contraindications rather than cautions. Search PubMed.
12. White snakeroot, tremetol and milk sickness. The look-alike sharing boneset's range, season and flower colour — hazardous by a completely different toxin. Search PubMed.
13. Compositae contact dermatitis and sesquiterpene lactone sensitisation. A handling risk for anyone harvesting or processing daisy-family herbs, independent of ingestion. Search PubMed.

Four Kinds of Borrowed Evidence to Watch For

Boneset attracts an unusual number of substitution errors for such a small literature, and knowing the four shapes makes any source about this plant easier to read critically.

1. Species substitution. Work on Eupatorium cannabinum, on E. odoratum and relatives, or on plants now placed in Eutrochium or Ageratina, cited as boneset data. The genus has been dismembered taxonomically, so a citation reading “Eupatorium” is not automatically about E. perfoliatum.
2. Preparation substitution. Homeopathic Eupatorium perfoliatum studies cited as human evidence for the herb. This is the single largest source of apparent clinical data on boneset, and it is a different intervention by orders of magnitude in concentration, within a different explanatory framework.
3. Compound substitution. The eupafolin literature, or general sesquiterpene lactone and flavonoid pharmacology, credited to boneset without any account of how much of the compound a real preparation delivers or where it goes.
4. Solvent substitution. Hydroalcoholic-extract results — including the famous influenza-attachment finding — cited to support a hot water infusion. Different solvents extract different constituents in different proportions. A tea and a tincture are not the same intervention.

Strip all four out and what remains is a small, honest, mostly in-vitro literature from a few research groups, plus a large and genuinely valuable historical record. That is the actual state of knowledge about boneset, and these pages try to represent it without inflating it.

External Resources

• PubMed — the primary biomedical literature database. Every citation in this set links to a topic search here.
• LiverTox (NIH/NIDDK, NCBI Bookshelf) — the reference work on drug- and herb-induced liver injury, including herbal and dietary supplement hepatotoxicity.
• National Center for Complementary and Integrative Health (NIH) — plain-language, evidence-graded summaries of herbal products.
• MedlinePlus — consumer health information from the US National Library of Medicine, including a herbs and supplements section.
• European Food Safety Authority — the authority whose scientific opinions on pyrrolizidine alkaloids in food underpin much of the current regulatory position. Go here for actual figures rather than to any health website.
• European Medicines Agency — herbal monographs, and the source explaining what a traditional-use registration does and does not certify.
• USDA PLANTS Database — authoritative distribution and nomenclature for North American species, useful for the Eupatorium/Eutrochium/Ageratina question.
• Plants of the World Online (Kew) — current accepted names and synonymy, which is exactly what the taxonomic split makes necessary.
• CDC: Dengue — current guidance on the illness whose old popular name gave boneset its own, including the warning signs of severe dengue.
• World Health Organization — global guidance on influenza, dengue and traditional medicine.

Connections

• All Herbs
• Boneset — main article
• Boneset for Fever, and the Name
• Boneset in Eclectic and Folk Medicine
• Boneset: Immune and Preclinical Research
• Boneset Safety: Pyrrolizidine Alkaloids
• Coltsfoot Benefits — the closest parallel case
• Coltsfoot: PAs and Liver Risk
• Comfrey: Never Take It Internally
• Elderberry for Cold and Flu
• Echinacea for Cold and Flu
• Yarrow Benefits
• Meadowsweet for Joint Pain and Fever
• Andrographis
• Feverfew
• Influenza
• Dengue Fever
• Fever — symptom guide
• Jaundice
• Liver Function Tests
• Interactive: Fever and Thermoregulation

Back to Table of Contents

A note on what these pages are

This is an educational hub about a traditional North American herb. Boneset is documented here because it has a real and substantial place in the history of medicine on that continent, and because an honest account of it includes both the tradition and the total absence of clinical evidence. Nothing here is medical advice, a diagnosis, or a recommendation to use the plant. Boneset contains pyrrolizidine alkaloids and must be avoided entirely in pregnancy, while breastfeeding, in infants and children, and by anyone with liver disease; it is not suitable for long-term or repeated use by anyone. If you are unwell, feverish, or taking medication, talk to a qualified healthcare professional.