Costunolide

Costunolide at a Glance

Costunolide is a germacranolide sesquiterpene lactone — a ten-membered carbocyclic ring fused to a five-membered lactone — and it sits at a genuinely interesting position in plant chemistry: it is the parent molecule from which most other Asteraceae sesquiterpene lactones are built, including parthenolide, feverfew’s marker compound ^{4,5Reference 4Liu Q et al. · 2011Reconstitution of the costunolide biosynthetic pathway in yeast and Nicotiana benthamianaView study →Reference 5Liu Q et al. · 2014Elucidation and in planta reconstitution of the parthenolide biosynthetic pathwayView study →}.

Its own literature, though, comes mostly from a different plant. Costunolide is the principal lactone of costus root (Saussurea costus, also traded as Aucklandia costus / Aucklandia lappa), a Himalayan Asteraceae used for centuries in Ayurvedic and Chinese medicine for digestive and inflammatory complaints ^{29Reference 29Pandey MM et al. · 2007ReviewSaussurea costus — botanical, chemical and pharmacological review of an ayurvedic medicinal plantView study →}. It is also found in bay laurel, in Magnolia bark, in chicory, and as a minor companion lactone in feverfew ^{1,2,7,12Reference 1Kim DY · 2019ReviewCostunolide — a bioactive sesquiterpene lactone with diverse therapeutic potential — reviewView study →Reference 2Lin X et al. · 2015ReviewPotential anti-cancer activities and mechanisms of costunolide and dehydrocostuslactone — reviewView study →Reference 7Cankar K et al. · 2022CRISPR/Cas9 targeted inactivation of the kauniolide synthase in chicory results in accumulation of costunolide and its conjugates in taprootsView study →Reference 12Matsuda H et al. · 2002AnimalInhibitory mechanism of costunolide, a sesquiterpene lactone isolated from Laurus nobilis, on blood-ethanol elevation in rats — involvement of inhibition of gastric emptying and increase in gastric juice secretionView study →}.

Two things frame everything below. First, the evidence is almost entirely preclinical — hundreds of in-vitro papers, a scattering of rodent studies, and no human trial of the isolated molecule at all. Second, costunolide carries the α-methylene-γ-lactone warhead shared by the whole sesquiterpene-lactone class, which alkylates cysteine thiols indiscriminately. That single chemical feature explains most of the reported activity, most of the reported toxicity, and why “inhibits NF-κB in vitro” tells you far less about costunolide specifically than it first appears ^{28Reference 28Merfort I · 2011ReviewPerspectives on sesquiterpene lactones in inflammation and cancer — reviewView study →}.

Costunolide as the Parent Germacranolide

This is the part of costunolide’s story that is specific to it and not shared with the rest of the class: it is the branch point of Asteraceae sesquiterpene-lactone biosynthesis.

The pathway is unusually well characterised for a plant natural product. Farnesyl pyrophosphate is cyclised by germacrene A synthase (GAS), oxidised three times at C12 by germacrene A oxidase (GAO) to germacra-1(10),4,11(13)-trien-12-oic acid, and then hydroxylated and lactonised by costunolide synthase (COS, CYP71BL2/BL3) to give costunolide ^{4Reference 4Liu Q et al. · 2011Reconstitution of the costunolide biosynthetic pathway in yeast and Nicotiana benthamianaView study →}. Each enzyme has been cloned and the whole three-step route reconstituted in yeast and in Nicotiana benthamiana, which produced costunolide de novo ^{4Reference 4Liu Q et al. · 2011Reconstitution of the costunolide biosynthetic pathway in yeast and Nicotiana benthamianaView study →}.

Downstream, costunolide is the substrate for at least two divergent enzymes:

• Parthenolide synthase (PTS, CYP71CA1) epoxidises the 4,5-double bond of costunolide to give parthenolide. Reconstituting GAS + GAO + COS + PTS in tobacco produced parthenolide de novo — confirming costunolide as its direct precursor rather than merely a co-occurring relative ^{5Reference 5Liu Q et al. · 2014Elucidation and in planta reconstitution of the parthenolide biosynthetic pathwayView study →}.
• Kauniolide synthase (KLS, CYP71DD6) performs a stereoselective hydroxylation plus cyclisation–elimination in one step, converting costunolide into the guaianolide kauniolide — the gateway to the guaianolide branch that includes chicory’s lactucin-type bitters ^{6Reference 6Liu Q et al. · 2018Kauniolide synthase is a P450 with unusual hydroxylation and cyclization-elimination activityView study →}.

That branch structure has a neat experimental proof. When all three chicory kauniolide-synthase genes were knocked out with CRISPR/Cas9, the guaianolide bitters disappeared and the taproots accumulated costunolide and its conjugates at ~1.5 mg/g fresh weight — the substrate piling up behind a blocked enzyme ^{7Reference 7Cankar K et al. · 2022CRISPR/Cas9 targeted inactivation of the kauniolide synthase in chicory results in accumulation of costunolide and its conjugates in taprootsView study →}. It is the clearest single demonstration that costunolide is a metabolic hub rather than an endpoint.

Practically, this means costunolide and parthenolide almost always travel together in feverfew, and that a plant’s lactone profile is set less by which lactones it can make than by which downstream P450s it expresses.

The Class Warhead — What Is Actually Specific to Costunolide

Nearly every biological effect attributed to a sesquiterpene lactone traces to one structural feature: the exocyclic α-methylene-γ-lactone, a Michael acceptor that forms covalent adducts with the free cysteine thiols of proteins and with glutathione ^{28Reference 28Merfort I · 2011ReviewPerspectives on sesquiterpene lactones in inflammation and cancer — reviewView study →}. Costunolide has it; so do parthenolide, helenalin, cynaropicrin, alantolactone and several hundred others.

The consequences are worth stating plainly:

• Thiol-dependent targets are hit by the whole class. NF-κB signalling (via cysteines in IKKβ and the p65 Rel-homology domain), Keap1/Nrf2, thioredoxin reductase, tubulin cysteines and GSH homeostasis are all reported targets for many different lactones. A paper showing costunolide inhibits NF-κB in a cell line ^{8Reference 8Koo TH et al. · 2001In vitroA sesquiterpene lactone, costunolide, from Magnolia grandiflora inhibits NF-kappa B by targeting I kappa B phosphorylation — in vitroView study →} is therefore weak evidence about costunolide and strong evidence about the warhead.
• Poor selectivity is the expected result, not an anomaly. Because the electrophile does not read sequence context, cytotoxicity in a cancer cell line rarely reflects a tumour-specific target. Reviews of the class are explicit that specificity, pharmacokinetics and ADME are the unsolved problems standing between sesquiterpene lactones and clinical use ^{28Reference 28Merfort I · 2011ReviewPerspectives on sesquiterpene lactones in inflammation and cancer — reviewView study →}.
• The molecule is consumed by thiols in vivo. In planta, engineered costunolide and parthenolide accumulate largely as cysteine and glutathione conjugates rather than as the free lactone ^{5,7Reference 5Liu Q et al. · 2014Elucidation and in planta reconstitution of the parthenolide biosynthetic pathwayView study →Reference 7Cankar K et al. · 2022CRISPR/Cas9 targeted inactivation of the kauniolide synthase in chicory results in accumulation of costunolide and its conjugates in taprootsView study →} — the same chemistry that happens in plasma and cytosol, and a major reason free-lactone exposure after an oral dose is low and short-lived ^{24Reference 24Zhang J et al. · 2014AnimalPharmacokinetic study on costunolide and dehydrocostuslactone after oral administration of traditional medicine Aucklandia lappa Decne. by LC/MS/MS — animal model in ratsView study →}.

What is reasonably specific to costunolide, on current evidence, is a small list: the biosynthetic position above; potency in the low-micromolar range on nitric-oxide production (IC50 1.2–2.8 µM in LPS-activated macrophages, shared with dehydrocostus lactone and the saussureamines) ^{9Reference 9Matsuda H et al. · 2003In vitroEffects of sesquiterpenes and amino acid-sesquiterpene conjugates from the roots of Saussurea lappa on inducible nitric oxide synthase and heat shock protein in lipopolysaccharide-activated macrophages — in vitroView study →}; induction of heme oxygenase-1 via Nrf2 as a required step for its cytokine suppression, shown by loss of effect under HO-1 inhibition ^{10Reference 10Pae HO et al. · 2007In vitroCostunolide inhibits production of tumor necrosis factor-alpha and interleukin-6 by inducing heme oxygenase-1 in RAW264.7 macrophages — in vitroView study →}; and a selective reduction of detyrosinated tubulin that costunolide and parthenolide share but which is demonstrably independent of their NF-κB inhibition ^{20Reference 20Whipple RA et al. · 2013In vitroParthenolide and costunolide reduce microtentacles and tumor cell attachment by selectively targeting detyrosinated tubulin independent from NF-κB inhibition — in vitroView study →}. Everything else here should be read as class chemistry until shown otherwise.

What It's Used For

The research base is broad and shallow: many in-vitro papers, a handful of rodent studies, no human data on the isolate. Read every row below as preclinical.

Evidence by IndicationStrength of support · Beta

Support is an experimental score — weighted by study type (human > animal > in vitro) and volume. A beta, not a validated metric. Every application here is preclinical, so the whole scale sits low by design; the ranking reflects replication and whether an intact animal was involved, not clinical usefulness.

01Anti-Inflammatory SignallingShaky36%Replicated in-vitro NO/iNOS, IκB and HO-1/Nrf2 work at low-µM ^{8,9,10Reference 8Koo TH et al. · 2001In vitroA sesquiterpene lactone, costunolide, from Magnolia grandiflora inhibits NF-kappa B by targeting I kappa B phosphorylation — in vitroView study →Reference 9Matsuda H et al. · 2003In vitroEffects of sesquiterpenes and amino acid-sesquiterpene conjugates from the roots of Saussurea lappa on inducible nitric oxide synthase and heat shock protein in lipopolysaccharide-activated macrophages — in vitroView study →Reference 10Pae HO et al. · 2007In vitroCostunolide inhibits production of tumor necrosis factor-alpha and interleukin-6 by inducing heme oxygenase-1 in RAW264.7 macrophages — in vitroView study →}

02Gastroprotection / AntiulcerShaky32%Oral dose-ranging in mice with an omeprazole comparator + rat gastric-secretion study ^{11,12Reference 11Zheng H et al. · 2016AnimalEvaluation of protective effects of costunolide and dehydrocostuslactone on ethanol-induced gastric ulcer in mice based on multi-pathway regulationView study →Reference 12Matsuda H et al. · 2002AnimalInhibitory mechanism of costunolide, a sesquiterpene lactone isolated from Laurus nobilis, on blood-ethanol elevation in rats — involvement of inhibition of gastric emptying and increase in gastric juice secretionView study →}

03Cancer Cell CytotoxicityShaky30%Many cell lines + a few mouse xenograft/carcinogenesis models; no human data ^{13,14,15,19,21Reference 13Lee MG et al. · 2001In vitroCostunolide induces apoptosis by ROS-mediated mitochondrial permeability transition and cytochrome C release — in vitroView study →Reference 14Choi JH · 2009In vitroCostunolide-induced apoptosis in human leukemia cells — involvement of c-jun N-terminal kinase activation — in vitroView study →Reference 15Kanno S et al. · 2008In vitroCostunolide-induced apoptosis is caused by receptor-mediated pathway and inhibition of telomerase activity in NALM-6 cells — in vitroView study →Reference 19Choi YK et al. · 2013In vitroSaussurea lappa Clarke-derived costunolide prevents TNFα-induced breast cancer cell migration and invasion by inhibiting NF-κB activity — in vitro and orthotopic mouse modelView study →Reference 21Ohnishi M et al. · 1997AnimalInhibitory effects of dietary protocatechuic acid and costunolide on 7,12-dimethylbenz[a]anthracene-induced hamster cheek pouch carcinogenesis — animal modelView study →}

04Antiangiogenic ActivityShaky22%Single-group KDR/Flk-1 autophosphorylation work + mouse corneal assay ^{18Reference 18Jeong SJ et al. · 2002In vitroCostunolide, a sesquiterpene lactone from Saussurea lappa, inhibits the VEGFR KDR/Flk-1 signaling pathway — in vitro and mouse corneal micropocket assayView study →}

05Telomerase InhibitionShaky20%hTERT suppression in breast and leukaemia lines; used as a TERT tool compound in glioma ^{15,16,17Reference 15Kanno S et al. · 2008In vitroCostunolide-induced apoptosis is caused by receptor-mediated pathway and inhibition of telomerase activity in NALM-6 cells — in vitroView study →Reference 16Choi SH et al. · 2005In vitroInhibitory effects of costunolide on the telomerase activity in human breast carcinoma cells — in vitroView study →Reference 17Ahmad F et al. · 2016In vitroNrf2-driven TERT regulates pentose phosphate pathway in glioblastoma — in vitro and mouse xenograftView study →}

06Hair Growth PromotionShaky16%One dermal-papilla proliferation + C57BL/6 mouse study ^{22Reference 22Kim YE et al. · 2019AnimalCostunolide promotes the proliferation of human hair follicle dermal papilla cells and induces hair growth in C57BL/6 miceView study →}

07Anti-Helicobacter ActivityShaky12%One in-vitro MIC study at concentrations far above plausible tissue levels ^{23Reference 23Park JB et al. · 1997In vitroAnti-Helicobacter pylori effect of costunolide isolated from the stem bark of Magnolia sieboldii — in vitroView study →}

Mechanisms

Pharmacokinetics

There is no human pharmacokinetic data for costunolide, and no published absolute oral bioavailability figure in any species. What exists comes from rats dosed with whole Aucklandia lappa (Radix Aucklandiae) extract rather than the pure compound:

• After oral extract administration, costunolide showed t½ ≈ 5.5 ± 0.8 h, a late Tmax ≈ 10.5 h and AUC ≈ 309 ng·h/mL by LC-MS/MS ^{24Reference 24Zhang J et al. · 2014AnimalPharmacokinetic study on costunolide and dehydrocostuslactone after oral administration of traditional medicine Aucklandia lappa Decne. by LC/MS/MS — animal model in ratsView study →}.
• A second rat study using the same herb reported double-peak plasma profiles for costunolide and dehydrocostus lactone, and found the profile changed in gastric-ulcer rats relative to normal ones — i.e. the disease state alters exposure ^{25Reference 25Dong S et al. · 2018AnimalPharmacokinetics of costunolide and dehydrocostuslactone after oral administration of Radix aucklandiae extract in normal and gastric ulcer ratsView study →}.

Two chemistry facts constrain how far any of this can be pushed. First, the α-methylene-γ-lactone reacts with free thiols, so a meaningful fraction of an absorbed dose is expected to exist as glutathione and cysteine conjugates rather than free lactone — this is directly observable in plants, where engineered costunolide accumulates predominantly as conjugates ^{5,7Reference 5Liu Q et al. · 2014Elucidation and in planta reconstitution of the parthenolide biosynthetic pathwayView study →Reference 7Cankar K et al. · 2022CRISPR/Cas9 targeted inactivation of the kauniolide synthase in chicory results in accumulation of costunolide and its conjugates in taprootsView study →}. Second, the class reviews identify pharmacokinetics and ADME as the specific barrier to clinical development of sesquiterpene lactones ^{28Reference 28Merfort I · 2011ReviewPerspectives on sesquiterpene lactones in inflammation and cancer — reviewView study →}. Any in-vitro finding quoted at 10–50 µM should be read against plasma concentrations that, on the only available rodent data, sit in the low ng/mL range ^{24Reference 24Zhang J et al. · 2014AnimalPharmacokinetic study on costunolide and dehydrocostuslactone after oral administration of traditional medicine Aucklandia lappa Decne. by LC/MS/MS — animal model in ratsView study →}.

Clinical Trials

No registered clinical trial has studied costunolide as an isolated intervention; a ClinicalTrials.gov search returns no studies naming the compound.

Last checked: July 2026.

Isolate vs. Plant Studies

The split here is unusually clean, and unusually one-sided.

Almost all the pharmacology is the isolate. Every study cited above used purified costunolide, typically sourced from Saussurea lappa ^{9,18,19Reference 9Matsuda H et al. · 2003In vitroEffects of sesquiterpenes and amino acid-sesquiterpene conjugates from the roots of Saussurea lappa on inducible nitric oxide synthase and heat shock protein in lipopolysaccharide-activated macrophages — in vitroView study →Reference 18Jeong SJ et al. · 2002In vitroCostunolide, a sesquiterpene lactone from Saussurea lappa, inhibits the VEGFR KDR/Flk-1 signaling pathway — in vitro and mouse corneal micropocket assayView study →Reference 19Choi YK et al. · 2013In vitroSaussurea lappa Clarke-derived costunolide prevents TNFα-induced breast cancer cell migration and invasion by inhibiting NF-κB activity — in vitro and orthotopic mouse modelView study →}, Magnolia sieboldii or M. grandiflora ^{8,15,23Reference 8Koo TH et al. · 2001In vitroA sesquiterpene lactone, costunolide, from Magnolia grandiflora inhibits NF-kappa B by targeting I kappa B phosphorylation — in vitroView study →Reference 15Kanno S et al. · 2008In vitroCostunolide-induced apoptosis is caused by receptor-mediated pathway and inhibition of telomerase activity in NALM-6 cells — in vitroView study →Reference 23Park JB et al. · 1997In vitroAnti-Helicobacter pylori effect of costunolide isolated from the stem bark of Magnolia sieboldii — in vitroView study →}, or Laurus nobilis ^{12Reference 12Matsuda H et al. · 2002AnimalInhibitory mechanism of costunolide, a sesquiterpene lactone isolated from Laurus nobilis, on blood-ethanol elevation in rats — involvement of inhibition of gastric emptying and increase in gastric juice secretionView study →}. That is normally a strength — it means the findings genuinely describe the molecule. Here it comes with a catch: the isolate work is entirely preclinical, so there is no human evidence of any kind for costunolide, in isolate or plant form, to transfer between.

Almost all the human exposure is the plant. Costus root, feverfew, bay leaf and chicory are what people actually take, and in every one of them costunolide arrives inside a mixture. In costus root it is accompanied by dehydrocostus lactone, usually at higher concentration and with an almost identical activity profile — the two are reported together so routinely that findings are easy to misattribute ^{2,11,24,30Reference 2Lin X et al. · 2015ReviewPotential anti-cancer activities and mechanisms of costunolide and dehydrocostuslactone — reviewView study →Reference 11Zheng H et al. · 2016AnimalEvaluation of protective effects of costunolide and dehydrocostuslactone on ethanol-induced gastric ulcer in mice based on multi-pathway regulationView study →Reference 24Zhang J et al. · 2014AnimalPharmacokinetic study on costunolide and dehydrocostuslactone after oral administration of traditional medicine Aucklandia lappa Decne. by LC/MS/MS — animal model in ratsView study →Reference 30Bhushan A et al. · 2023In vitroHPLC-PDA method for quantification of bioactive compounds in crude extract and fractions of Aucklandia costus Falc. and cytotoxicity studies against cancer cells — in vitroView study →}. In feverfew it is a minor companion to parthenolide, which dominates the sesquiterpene-lactone fraction and carries feverfew’s standardisation and its migraine literature.

The transferability caveat is therefore severe in both directions. No clinical result for costus root or feverfew can be credited to costunolide, because the co-occurring lactones share the same warhead and the same targets. And no in-vitro costunolide result can be credited to the herb, because plasma levels after realistic oral intake sit orders of magnitude below assay concentrations ^{24Reference 24Zhang J et al. · 2014AnimalPharmacokinetic study on costunolide and dehydrocostuslactone after oral administration of traditional medicine Aucklandia lappa Decne. by LC/MS/MS — animal model in ratsView study →}.

The one place the two layers genuinely converge is the gastric work: a documented traditional digestive use for costus root ^{29Reference 29Pandey MM et al. · 2007ReviewSaussurea costus — botanical, chemical and pharmacological review of an ayurvedic medicinal plantView study →} and a measured oral gastroprotective effect for the isolate in mice ^{11Reference 11Zheng H et al. · 2016AnimalEvaluation of protective effects of costunolide and dehydrocostuslactone on ethanol-induced gastric ulcer in mice based on multi-pathway regulationView study →}. That convergence is worth noting and is not proof.

Prevalence in Nature

Costunolide occurs across the Asteraceae and, less commonly, in the Lauraceae and Magnoliaceae — an unusually wide distribution for a sesquiterpene lactone, and consistent with its role as a biosynthetic hub rather than a terminal product ^{1,2Reference 1Kim DY · 2019ReviewCostunolide — a bioactive sesquiterpene lactone with diverse therapeutic potential — reviewView study →Reference 2Lin X et al. · 2015ReviewPotential anti-cancer activities and mechanisms of costunolide and dehydrocostuslactone — reviewView study →}.

Within the Asteraceae, it is most abundant in the roots of Saussurea costus / Aucklandia costus, where it and dehydrocostus lactone are the two dominant lactones ^{29,30Reference 29Pandey MM et al. · 2007ReviewSaussurea costus — botanical, chemical and pharmacological review of an ayurvedic medicinal plantView study →Reference 30Bhushan A et al. · 2023In vitroHPLC-PDA method for quantification of bioactive compounds in crude extract and fractions of Aucklandia costus Falc. and cytotoxicity studies against cancer cells — in vitroView study →}. In chicory it is normally an invisible intermediate — rapidly converted onward by kauniolide synthase — and only accumulates when that step is disabled ^{7Reference 7Cankar K et al. · 2022CRISPR/Cas9 targeted inactivation of the kauniolide synthase in chicory results in accumulation of costunolide and its conjugates in taprootsView study →}. In feverfew it is present but has never been quantified in the way parthenolide has; feverfew’s assays and standards are built around parthenolide, and costunolide rides along uncounted.

Outside the Asteraceae, costunolide is the compound isolated from bay laurel (Laurus nobilis) in the rat gastric-emptying work ^{12Reference 12Matsuda H et al. · 2002AnimalInhibitory mechanism of costunolide, a sesquiterpene lactone isolated from Laurus nobilis, on blood-ethanol elevation in rats — involvement of inhibition of gastric emptying and increase in gastric juice secretionView study →}, and from the stem bark of Magnolia sieboldii and M. grandiflora in the apoptosis and NF-κB studies ^{8,15,23Reference 8Koo TH et al. · 2001In vitroA sesquiterpene lactone, costunolide, from Magnolia grandiflora inhibits NF-kappa B by targeting I kappa B phosphorylation — in vitroView study →Reference 15Kanno S et al. · 2008In vitroCostunolide-induced apoptosis is caused by receptor-mediated pathway and inhibition of telomerase activity in NALM-6 cells — in vitroView study →Reference 23Park JB et al. · 1997In vitroAnti-Helicobacter pylori effect of costunolide isolated from the stem bark of Magnolia sieboldii — in vitroView study →}.

Major Natural Sources

Figures below are on different bases and are not directly comparable — this is the honest state of the quantitative literature rather than a like-for-like chart.

Source	Part	Reported costunolide	Basis
Costus / Aucklandia costus	Rhizome / root	4.33 µg/mg (~0.43%) of a 70% ethanol crude extract; 65.07 µg/mg (~6.5%) of the hexane fraction	HPLC-PDA on extract and fractions, not on dried root 30Reference 30Bhushan A et al. · 2023In vitroHPLC-PDA method for quantification of bioactive compounds in crude extract and fractions of Aucklandia costus Falc. and cytotoxicity studies against cancer cells — in vitroView study →
Costus / Saussurea lappa	Root, and polyherbal formulations	Quantified by validated HPLC-DAD alongside dehydrocostus lactone	Method-development and stability study 31Reference 31Rao Vadaparthi PR et al. · 2015Estimation of costunolide and dehydrocostus lactone in Saussurea lappa and its polyherbal formulations followed by their stability studies using HPLC-DADView study →
Chicory (Cichorium intybus)	Taproot	~1.5 mg/g fresh weight — only in CRISPR kauniolide-synthase knockouts; near-absent in wild type	Engineered lines; not a natural abundance figure 7Reference 7Cankar K et al. · 2022CRISPR/Cas9 targeted inactivation of the kauniolide synthase in chicory results in accumulation of costunolide and its conjugates in taprootsView study →
Feverfew (Tanacetum parthenium)	Aerial parts	Present, not quantified	Qualitative only; assays target parthenolide
Bay laurel (Laurus nobilis)	Leaf	Present, not quantified	Isolated for pharmacology, no content figure 12Reference 12Matsuda H et al. · 2002AnimalInhibitory mechanism of costunolide, a sesquiterpene lactone isolated from Laurus nobilis, on blood-ethanol elevation in rats — involvement of inhibition of gastric emptying and increase in gastric juice secretionView study →
Magnolia (Magnolia sieboldii, M. grandiflora)	Stem bark	Present, not quantified	Isolated for pharmacology, no content figure 8,23Reference 8Koo TH et al. · 2001In vitroA sesquiterpene lactone, costunolide, from Magnolia grandiflora inhibits NF-kappa B by targeting I kappa B phosphorylation — in vitroView study →Reference 23Park JB et al. · 1997In vitroAnti-Helicobacter pylori effect of costunolide isolated from the stem bark of Magnolia sieboldii — in vitroView study →

Its Role in Plants

Sesquiterpene lactones are the daisy family’s chemical defence — bitter, feeding-deterrent, and antimicrobial — and their bitterness is what makes chicory, endive and artichoke taste the way they do. Costunolide’s specific role is structural rather than functional: it is the committed intermediate through which nearly all germacranolide and guaianolide defences are routed ^{4,6,7Reference 4Liu Q et al. · 2011Reconstitution of the costunolide biosynthetic pathway in yeast and Nicotiana benthamianaView study →Reference 6Liu Q et al. · 2018Kauniolide synthase is a P450 with unusual hydroxylation and cyclization-elimination activityView study →Reference 7Cankar K et al. · 2022CRISPR/Cas9 targeted inactivation of the kauniolide synthase in chicory results in accumulation of costunolide and its conjugates in taprootsView study →}. Knocking out its downstream enzyme in chicory does not remove the plant’s ability to make lactones — it just leaves the pipeline backed up at costunolide ^{7Reference 7Cankar K et al. · 2022CRISPR/Cas9 targeted inactivation of the kauniolide synthase in chicory results in accumulation of costunolide and its conjugates in taprootsView study →}.

Costus Root, CITES and the Supply Constraint

Most of costunolide’s pharmacology comes from a plant that is illegal to trade freely.

Saussurea costus was listed on CITES Appendix II in 1975 and uplisted to Appendix I in 1985 at India’s proposal, and it is assessed as Critically Endangered on the IUCN Red List after a documented steep decline in wild populations ^{32Reference 32CITES Plants CommitteeReviewA review of the status of Saussurea costus — review (PC19 DocView study →}. Appendix I is the strictest CITES tier: international commercial trade in wild-sourced material is prohibited, and India additionally bans wild collection and restricts cultivation, marketing and export ^{32Reference 32CITES Plants CommitteeReviewA review of the status of Saussurea costus — review (PC19 DocView study →}.

This matters for reading the literature in three ways:

• Material provenance is often unstated. Papers citing “Saussurea lappa” rarely say whether the root was cultivated under permit, and the lappa / costus / Aucklandia naming tangle makes provenance harder to audit.
• It constrains future study. A compound whose richest source is an Appendix-I plant is a poor development candidate unless it comes from cultivation, from an alternative source (bay laurel, Magnolia, chicory), or from biosynthesis in an engineered host — which is part of why the yeast and tobacco reconstitution work matters commercially and not only mechanistically ^{4,6Reference 4Liu Q et al. · 2011Reconstitution of the costunolide biosynthetic pathway in yeast and Nicotiana benthamianaView study →Reference 6Liu Q et al. · 2018Kauniolide synthase is a P450 with unusual hydroxylation and cyclization-elimination activityView study →}.
• It is a consumer-facing issue. Costus root still circulates in the herbal and perfumery trade. Sourcing claims deserve scrutiny, and “wild Himalayan costus” is a red flag rather than a selling point.

Discovery & Synthesis

First isolation. Costunolide was isolated from costus root oil and its structure elucidated in 1960 by A. Somasekar Rao, G. R. Kelkar and S. C. Bhattacharyya at the National Chemical Laboratory in Pune, as part of their Terpenoids series; the structure was settled by dehydrogenation, ozonolysis and mild conversion to santanolide C ^{3Reference 3Rao AS et al. · 1960Terpenoids — XXIView study →}. The name is straightforwardly source-derived — costus root plus the -olide suffix that marks a lactone. Related lactone work on the same plant predates it (a crystalline “saussurea lactone” was reported in 1951), but the 1960 paper is the structural anchor.

Total synthesis. Costunolide has been a recurring target for synthetic chemists because the strained ten-membered germacranolide ring is genuinely difficult to close, but no single first total synthesis is cleanly documented in the sources verified — treat any specific attribution with caution until it can be pinned to a primary reference.

Manufacture today. Practical supply is by extraction and chromatographic purification, chiefly from Aucklandia / Saussurea root, where costunolide concentrates in non-polar fractions (a hexane fraction ran ~15× the crude-extract concentration) ^{30Reference 30Bhushan A et al. · 2023In vitroHPLC-PDA method for quantification of bioactive compounds in crude extract and fractions of Aucklandia costus Falc. and cytotoxicity studies against cancer cells — in vitroView study →}. Countercurrent chromatography and preparative HPLC are the standard separation routes, and the recurring difficulty is resolving costunolide from dehydrocostus lactone, which co-elutes on many systems ^{31Reference 31Rao Vadaparthi PR et al. · 2015Estimation of costunolide and dehydrocostus lactone in Saussurea lappa and its polyherbal formulations followed by their stability studies using HPLC-DADView study →}. The biotechnological route is the live alternative: the full pathway has been expressed in yeast and in Nicotiana benthamiana, and CRISPR-modified chicory accumulates costunolide directly in taproots ^{4,7Reference 4Liu Q et al. · 2011Reconstitution of the costunolide biosynthetic pathway in yeast and Nicotiana benthamianaView study →Reference 7Cankar K et al. · 2022CRISPR/Cas9 targeted inactivation of the kauniolide synthase in chicory results in accumulation of costunolide and its conjugates in taprootsView study →} — an attractive answer to an Appendix-I supply chain, though yields to date are research-scale.

Patents: not yet researched.

Toxicity & Safety

Contact allergy is the documented human hazard. Costunolide is one of the three lactones in the standard sesquiterpene-lactone (SL) mix patch-test allergen — with alantolactone and dehydrocostus lactone — developed in the 1980s to screen for Compositae sensitisation and included in European and North American baseline series ever since ^{26Reference 26Paulsen E · 2023ReviewThe sesquiterpene lactone mix — a review of past, present and future aspectsView study →}. In a four-year series of 7,420 eczema patients patch-tested with SL mix 0.1%, 135 (1.8%) reacted positively, and 84% of those reactions were judged clinically relevant; presentations ranged from hand or facial eczema to generalised eczema, with a notable association with chronic actinic dermatitis in older men ^{27Reference 27Ross JS et al. · 1993ObservationalSesquiterpene lactone contact sensitivity — clinical patterns of Compositae dermatitis and relationship to chronic actinic dermatitis — cross-sectional patch-test series over four yearsView study →}. Current European prevalence sits near 1% and North American near 0.8% ^{26Reference 26Paulsen E · 2023ReviewThe sesquiterpene lactone mix — a review of past, present and future aspectsView study →}. Costunolide, alantolactone and parthenolide are described as comparably strong sensitisers, and cross-reactivity between them is the rule rather than the exception — someone sensitised to one Asteraceae lactone should assume sensitivity to the others ^{26Reference 26Paulsen E · 2023ReviewThe sesquiterpene lactone mix — a review of past, present and future aspectsView study →}.

Cytotoxicity is non-selective by design. The α-methylene-γ-lactone alkylates accessible cysteine thiols without regard to which protein carries them ^{28Reference 28Merfort I · 2011ReviewPerspectives on sesquiterpene lactones in inflammation and cancer — reviewView study →}. That is the mechanism behind the apoptosis findings, and it is equally the mechanism by which the compound damages normal cells; costunolide depletes glutathione and generates ROS in cell culture ^{13,14Reference 13Lee MG et al. · 2001In vitroCostunolide induces apoptosis by ROS-mediated mitochondrial permeability transition and cytochrome C release — in vitroView study →Reference 14Choi JH · 2009In vitroCostunolide-induced apoptosis in human leukemia cells — involvement of c-jun N-terminal kinase activation — in vitroView study →}. Selectivity has not been demonstrated.

What has not been assessed. No acute or repeat-dose toxicology study of isolated costunolide in humans exists. There is no human interaction data at all — no CYP inhibition or induction profile, no P-glycoprotein data. Given that the molecule conjugates glutathione, a theoretical interaction with drugs that also consume GSH (paracetamol at high dose, for example) is plausible but entirely unstudied; state it as a scope gap, not a finding. Reproductive and developmental toxicity for the isolate are likewise uncharacterised. Silence in this section is absence of study, not evidence of safety.

Herb-level context. Feverfew’s known adverse effects — mouth ulceration from chewing fresh leaves, Asteraceae allergic reactions — are class effects of its sesquiterpene lactones as a group, and costunolide is part of that group even though parthenolide is the dominant contributor. Pregnancy and lactation decisions belong on the herb and supplement pages, where intake is actually decided.

Safety at a Glance

⚠️ Moderate toxicitySkin allergy

• A documented contact sensitiser. One of the three allergens in the standard sesquiterpene-lactone patch-test mix; ~1–2% of patch-tested eczema patients react, and most reactions are clinically relevant ^{26,27Reference 26Paulsen E · 2023ReviewThe sesquiterpene lactone mix — a review of past, present and future aspectsView study →Reference 27Ross JS et al. · 1993ObservationalSesquiterpene lactone contact sensitivity — clinical patterns of Compositae dermatitis and relationship to chronic actinic dermatitis — cross-sectional patch-test series over four yearsView study →}.
• Cross-reacts across the daisy family. Sensitisation to costunolide, alantolactone, dehydrocostus lactone or parthenolide should be assumed to carry across all of them and to Asteraceae plants generally ^{26Reference 26Paulsen E · 2023ReviewThe sesquiterpene lactone mix — a review of past, present and future aspectsView study →}.
• Non-selective cytotoxicity. The reactive lactone alkylates cysteine thiols indiscriminately and depletes glutathione — the same chemistry underlies the anticancer findings and the cell damage ^{13,28Reference 13Lee MG et al. · 2001In vitroCostunolide induces apoptosis by ROS-mediated mitochondrial permeability transition and cytochrome C release — in vitroView study →Reference 28Merfort I · 2011ReviewPerspectives on sesquiterpene lactones in inflammation and cancer — reviewView study →}.
• No human safety data whatsoever. No human trial, no toxicology study, no interaction profile, no reproductive data for the isolated compound.
• Handle plant material with gloves if sensitised. Costus root, feverfew and other Asteraceae are the realistic exposure route; occupational and horticultural contact drives most reported dermatitis ^{26,27Reference 26Paulsen E · 2023ReviewThe sesquiterpene lactone mix — a review of past, present and future aspectsView study →Reference 27Ross JS et al. · 1993ObservationalSesquiterpene lactone contact sensitivity — clinical patterns of Compositae dermatitis and relationship to chronic actinic dermatitis — cross-sectional patch-test series over four yearsView study →}.
• Ordinary dietary exposure is trace-level. Bay leaf and chicory contain costunolide at amounts too small to have been quantified, and no dietary toxicity has been reported.

Dosage

There is no human dose for costunolide. No trial has administered the isolated compound to people, so nothing below is a recommendation — these are the doses used in animal research, listed so that in-vitro and in-vivo claims can be read against real numbers.

The gap between the concentrations that produce effects in a dish (single-digit to tens of µM) and the plasma levels measured after an oral herb dose (low ng/mL) ^{24Reference 24Zhang J et al. · 2014AnimalPharmacokinetic study on costunolide and dehydrocostuslactone after oral administration of traditional medicine Aucklandia lappa Decne. by LC/MS/MS — animal model in ratsView study →} is the single most important number here. These are doses studied in research and are not a personal recommendation.

References

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