Caryophyllene Oxide

Caryophyllene Oxide at a Glance

Caryophyllene oxide is a naturally occurring bicyclic sesquiterpene epoxide — the oxidation (epoxidation) product of the peppery dietary sesquiterpene β-caryophyllene. It turns up across the plant kingdom as a minor oxygenated component of essential oils, and accumulates as those oils age, so it is often a marker of oxidised or cured plant material rather than a compound the plant makes in bulk. It is a defining volatile of epazote and jatoba leaves, and a well-known secondary terpene of cannabis, black pepper and clove.

Two facts make it distinctive. First, it is widely cited as the compound cannabis-detection dogs are trained to identify ^{1Reference 1Russo EB · 2011Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effectsView study →}. Second — and easy to get wrong — it does not carry over β-caryophyllene’s cannabinoid pharmacology: the parent is a selective CB2-receptor agonist, whereas the oxide is not, and its own activity runs through non-cannabinoid routes ^{8Reference 8Fidyt K et al. · 2016Fidyt K, et al. (2016). β-Caryophyllene and β-caryophyllene oxide — natural compounds of anticancer and analgesic properties. Cancer Medicine. https://pubmed.ncbi.nlm.nih.gov/27696789/View study →}.

As an isolate it has a modest but genuine preclinical research base — anti-inflammatory and analgesic effects in rodents, in-vitro anti-platelet activity, and repeated in-vitro pro-apoptotic (anticancer) signals through NF-κB and PI3K/AKT suppression ^{2,3,4,5Reference 2Chavan MJ et al. · 2010Analgesic and anti-inflammatory activity of caryophyllene oxide from Annona squamosa L. barkView study →Reference 3Espinosa-Juárez JV et al. · 2024Synergistic antinociceptive effect of β-caryophyllene oxide in combination with paracetamol, and the corresponding gastroprotective activityView study →Reference 4Park KR et al. · 2011Park KR, et al. (2011). β-Caryophyllene oxide inhibits growth and induces apoptosis through the suppression of PI3K/AKT/mTOR/S6K1 pathways and ROS-mediated MAPKs activation. Cancer Letters. https://pubmed.ncbi.nlm.nih.gov/21924548/View study →Reference 5Kim C et al. · 2014Kim C, et al. (2014). β-Caryophyllene oxide potentiates TNFα-induced apoptosis and inhibits invasion through down-modulation of NF-κB-regulated gene products. Apoptosis. https://pubmed.ncbi.nlm.nih.gov/24370994/View study →}. As with most essential-oil terpenes, that evidence is almost entirely preclinical, on the isolated molecule, at concentrations well above ordinary dietary exposure.

Caryophyllene Oxide vs. β-Caryophyllene

Caryophyllene oxide and β-caryophyllene are closely related but pharmacologically distinct, and conflating them is the most common error about this molecule.

They differ by one oxygen. β-Caryophyllene is a bicyclic sesquiterpene with a reactive exocyclic double bond; caryophyllene oxide is its epoxide — the product of that double bond being oxidised, whether enzymatically in the plant or simply by exposure to air, light and time. This is why the oxide builds up in stored, cured or aged material (dried cannabis, matured essential oils) as the parent slowly oxidises.

The load-bearing distinction is the cannabinoid receptor. β-Caryophyllene is notable as the one common dietary terpene that is a selective functional agonist at the CB2 cannabinoid receptor, giving it a defined endocannabinoid-linked anti-inflammatory mechanism. Caryophyllene oxide does not reproduce that action — it is not a CB2 agonist, and its own anti-inflammatory and anticancer effects are attributed to non-cannabinoid pathways (NF-κB downmodulation, PI3K/AKT/mTOR suppression, ROS-mediated MAPK activation) ^{4,5,8Reference 4Park KR et al. · 2011Park KR, et al. (2011). β-Caryophyllene oxide inhibits growth and induces apoptosis through the suppression of PI3K/AKT/mTOR/S6K1 pathways and ROS-mediated MAPKs activation. Cancer Letters. https://pubmed.ncbi.nlm.nih.gov/21924548/View study →Reference 5Kim C et al. · 2014Kim C, et al. (2014). β-Caryophyllene oxide potentiates TNFα-induced apoptosis and inhibits invasion through down-modulation of NF-κB-regulated gene products. Apoptosis. https://pubmed.ncbi.nlm.nih.gov/24370994/View study →Reference 8Fidyt K et al. · 2016Fidyt K, et al. (2016). β-Caryophyllene and β-caryophyllene oxide — natural compounds of anticancer and analgesic properties. Cancer Medicine. https://pubmed.ncbi.nlm.nih.gov/27696789/View study →}. So the two molecules should not be assumed to share mechanisms just because they share a skeleton.

The detection-dog marker. Caryophyllene oxide is repeatedly identified as the volatile that drug-detection dogs are trained to associate with cannabis — it is stable, persists in dried and cured material as more volatile terpenes fade, and is used as an odour standard ^{1Reference 1Russo EB · 2011Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effectsView study →}. This claim should be read with a caveat: a chemical-and-sensory analysis of the marijuana headspace found that the compounds with the highest odour impact were not the most abundant terpenes, and did not single out caryophyllene oxide, so its status as the canine marker is more established in forensic practice and reviews than in odour-impact chemistry ^{1,10Reference 1Russo EB · 2011Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effectsView study →Reference 10Rice S · 2015Characterizing the smell of marijuana by odor impact of volatile compounds: an application of simultaneous chemical and sensory analysisView study →}.

Anti-Inflammatory & Anticancer Research

Caryophyllene oxide’s own evidence base is preclinical but real, and unusually isolate-heavy — most of the marquee studies test the purified molecule rather than a whole plant. The strongest and most-repeated signal is pro-apoptotic/anticancer activity in cell models; anti-inflammatory/analgesic activity is the best in-vivo signal; anti-platelet activity rests on a single isolate study.

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 entry here is isolate/preclinical, so scores stay modest by design. Each application links to its write-up.

01Anticancer / pro-apoptoticShaky40%Repeated in-vitro isolate mechanism studies (PI3K/AKT, NF-κB, ROS/MAPK) + jatoba bioassay isolation ^{4,5,7Reference 4Park KR et al. · 2011Park KR, et al. (2011). β-Caryophyllene oxide inhibits growth and induces apoptosis through the suppression of PI3K/AKT/mTOR/S6K1 pathways and ROS-mediated MAPKs activation. Cancer Letters. https://pubmed.ncbi.nlm.nih.gov/21924548/View study →Reference 5Kim C et al. · 2014Kim C, et al. (2014). β-Caryophyllene oxide potentiates TNFα-induced apoptosis and inhibits invasion through down-modulation of NF-κB-regulated gene products. Apoptosis. https://pubmed.ncbi.nlm.nih.gov/24370994/View study →Reference 7Delgado C et al. · 2021Caryophyllene oxide, the active compound isolated from leaves of Hymenaea courbaril L. (Fabaceae) with antiproliferative and apoptotic effects on the PC-3 androgen-independent prostate cancer cell lineView study →}

02Anti-inflammatory / analgesicShaky38%In-vivo rodent isolate (12.5–25 mg/kg); paracetamol synergy ^{2,3Reference 2Chavan MJ et al. · 2010Analgesic and anti-inflammatory activity of caryophyllene oxide from Annona squamosa L. barkView study →Reference 3Espinosa-Juárez JV et al. · 2024Synergistic antinociceptive effect of β-caryophyllene oxide in combination with paracetamol, and the corresponding gastroprotective activityView study →}

03Anti-plateletShaky24%Single in-vitro isolate study (Gynura rhizome constituents) ^{6Reference 6Lin WY et al. · 2003Anti-platelet aggregation and chemical constituents from the rhizome of Gynura japonicaView study →}

Mechanisms

The load-bearing contrast is the last-but-one row: the loss of β-caryophyllene’s CB2 agonism means caryophyllene oxide’s effects are non-cannabinoid, running instead through the NF-κB / PI3K-AKT / ROS-MAPK network ^{4,5,8Reference 4Park KR et al. · 2011Park KR, et al. (2011). β-Caryophyllene oxide inhibits growth and induces apoptosis through the suppression of PI3K/AKT/mTOR/S6K1 pathways and ROS-mediated MAPKs activation. Cancer Letters. https://pubmed.ncbi.nlm.nih.gov/21924548/View study →Reference 5Kim C et al. · 2014Kim C, et al. (2014). β-Caryophyllene oxide potentiates TNFα-induced apoptosis and inhibits invasion through down-modulation of NF-κB-regulated gene products. Apoptosis. https://pubmed.ncbi.nlm.nih.gov/24370994/View study →Reference 8Fidyt K et al. · 2016Fidyt K, et al. (2016). β-Caryophyllene and β-caryophyllene oxide — natural compounds of anticancer and analgesic properties. Cancer Medicine. https://pubmed.ncbi.nlm.nih.gov/27696789/View study →}.

Pharmacokinetics

Dedicated human ADME for isolated caryophyllene oxide is not well characterised — a recurring limit for essential-oil sesquiterpenes. It is a lipophilic, volatile molecule, so it is expected to be well absorbed but rapidly distributed and metabolised, with no established oral bioavailability figure, Cmax or half-life for the isolate in humans ^{8Reference 8Fidyt K et al. · 2016Fidyt K, et al. (2016). β-Caryophyllene and β-caryophyllene oxide — natural compounds of anticancer and analgesic properties. Cancer Medicine. https://pubmed.ncbi.nlm.nih.gov/27696789/View study →}. Two practical consequences follow: (1) the micromolar-to-µg/mL concentrations used in the in-vitro anticancer studies have no demonstrated in-vivo counterpart, so those results should not be read as achievable systemic effects ^{4,7Reference 4Park KR et al. · 2011Park KR, et al. (2011). β-Caryophyllene oxide inhibits growth and induces apoptosis through the suppression of PI3K/AKT/mTOR/S6K1 pathways and ROS-mediated MAPKs activation. Cancer Letters. https://pubmed.ncbi.nlm.nih.gov/21924548/View study →Reference 7Delgado C et al. · 2021Caryophyllene oxide, the active compound isolated from leaves of Hymenaea courbaril L. (Fabaceae) with antiproliferative and apoptotic effects on the PC-3 androgen-independent prostate cancer cell lineView study →}; and (2) because it forms by oxidation of β-caryophyllene, real-world exposure depends heavily on how oxidised the source material is — aged oils and cured cannabis carry proportionally more of it. Robust isolate PK (absorption fraction, metabolising enzymes, active metabolites) remains a documented gap.

Clinical Trials

There are no controlled human efficacy trials of isolated caryophyllene oxide. The entire evidence base is preclinical — rodent analgesia/anti-inflammation and in-vitro anticancer/anti-platelet mechanism work — plus its non-therapeutic, established real-world use as a forensic odour standard for cannabis-detection canines ^{1Reference 1Russo EB · 2011Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effectsView study →}.

Last checked: July 2026.

Isolate vs. Plant Studies

This molecule sits unusually far toward the isolate end of the spectrum. The core anticancer mechanism studies test purified caryophyllene oxide directly ^{4,5Reference 4Park KR et al. · 2011Park KR, et al. (2011). β-Caryophyllene oxide inhibits growth and induces apoptosis through the suppression of PI3K/AKT/mTOR/S6K1 pathways and ROS-mediated MAPKs activation. Cancer Letters. https://pubmed.ncbi.nlm.nih.gov/21924548/View study →Reference 5Kim C et al. · 2014Kim C, et al. (2014). β-Caryophyllene oxide potentiates TNFα-induced apoptosis and inhibits invasion through down-modulation of NF-κB-regulated gene products. Apoptosis. https://pubmed.ncbi.nlm.nih.gov/24370994/View study →}, the analgesic work isolated and dosed the pure compound ^{2Reference 2Chavan MJ et al. · 2010Analgesic and anti-inflammatory activity of caryophyllene oxide from Annona squamosa L. barkView study →}, and the anti-platelet finding is an isolated-constituent result ^{6Reference 6Lin WY et al. · 2003Anti-platelet aggregation and chemical constituents from the rhizome of Gynura japonicaView study →} — so as a preclinical mechanism base for the molecule itself, the evidence is genuine. The strongest plant-to-molecule bridge is the jatoba study, where bioassay-guided fractionation of the leaves converged on caryophyllene oxide as the active antiproliferative principle ^{7Reference 7Delgado C et al. · 2021Caryophyllene oxide, the active compound isolated from leaves of Hymenaea courbaril L. (Fabaceae) with antiproliferative and apoptotic effects on the PC-3 androgen-independent prostate cancer cell lineView study →}, and the classic ecology work that showed the oxide is the compound behind jatoba foliage’s antifungal, ant-repelling defence ^{11Reference 11Hubbell SP et al. · 1983An antifungal terpenoid defends a neotropical tree (Hymenaea) against attack by fungus-growing ants (Atta)View study →}. What is missing is the other direction: there are no whole-plant or whole-oil human trials attributable to this constituent, and in most source oils it is a minor component riding along with dozens of others. The correct framing is therefore solid isolate mechanism, minimal in-vivo, no human — the opposite of a molecule whose reputation is borrowed from a well-studied extract.

Its Role in Plants

Caryophyllene oxide arises from oxidation of β-caryophyllene — enzymatically in planta and abiotically on exposure to air and light — so it is best understood as an oxygenated derivative of the parent sesquiterpene rather than a separately biosynthesised terpene. Its accumulation in stored and senescing tissue is part of why it reads as a marker of aged or cured material.

Its clearest ecological role is chemical defence. In a landmark study of the neotropical tree Hymenaea courbaril (jatoba), caryophyllene oxide (as “caryophyllene epoxide”) was identified as the leaf terpenoid responsible for repelling leaf-cutting (Atta) ants and for potent, broad antifungal activity against the ants’ cultivated fungus and fungi generally — and it was reported to be roughly an order of magnitude more active in this role than its β-caryophyllene precursor ^{11Reference 11Hubbell SP et al. · 1983An antifungal terpenoid defends a neotropical tree (Hymenaea) against attack by fungus-growing ants (Atta)View study →}. The authors argued the anti-ant effect is an incidental consequence of selection for fungal resistance. The same oxygenated-sesquiterpene defence chemistry recurs elsewhere: in wood betony (Stachys officinalis), caryophyllene oxide and nerolidol dominate the flower volatiles while the parent caryophyllene dominates the leaf oil ^{12Reference 12Giuliani C et al. · 2017Secretory structures and essential oil composition in Stachys officinalis (L.) Trevisan subsp. officinalis (Lamiaceae) from ItalyView study →}.

Prevalence in Nature

Caryophyllene oxide is widely but thinly distributed — it appears across many aromatic families wherever β-caryophyllene occurs, because it is that molecule’s oxidation product. It is a characteristic constituent of the oxygenated-oil fraction of epazote (Dysphania ambrosioides), a defining defensive terpenoid of jatoba leaves ^{11Reference 11Hubbell SP et al. · 1983An antifungal terpenoid defends a neotropical tree (Hymenaea) against attack by fungus-growing ants (Atta)View study →}, and a flower-oil component of wood betony ^{12Reference 12Giuliani C et al. · 2017Secretory structures and essential oil composition in Stachys officinalis (L.) Trevisan subsp. officinalis (Lamiaceae) from ItalyView study →}. In cannabis it is a consistently detected secondary sesquiterpene, generated as flower material dries and cures, and it is likewise reported from black pepper, clove, hops, rosemary, lavender and lemon balm oils.

Because it is usually a minor component and its level rises with oxidation, quantified concentrations are inconsistent and method-dependent; it is rarely a dominant essential-oil constituent, and reliable comparative percentage figures across named sources are not well established (a tracked gap for a later pass).

Discovery & Synthesis

Caryophyllene oxide entered the literature as a derivative of caryophyllene rather than as an independently discovered natural product: it is the epoxide of β-caryophyllene, and much early interest was structural, since the caryophyllene skeleton and its oxide were classic problems in mid-twentieth-century sesquiterpene stereochemistry. A precise first-isolation date and discoverer are not well documented. Its first clearly defined biological role came in 1983, when Hubbell, Wiemer and Adejare characterised it as the antifungal, ant-repelling defence terpenoid of Hymenaea courbaril ^{11Reference 11Hubbell SP et al. · 1983An antifungal terpenoid defends a neotropical tree (Hymenaea) against attack by fungus-growing ants (Atta)View study →}.

Manufacture today is straightforward: it is obtained either by isolation from essential oils (or from oxidised caryophyllene fractions) or, more reliably, by direct epoxidation of β-caryophyllene with a peracid, which selectively oxidises the more reactive endocyclic-adjacent double bond. It is recognised as a flavour/fragrance material (woody odour) and is generally handled as a low-hazard aroma chemical, consistent with its parent’s GRAS flavouring status, though the two should not be treated as identical for regulatory purposes.

Patents: not yet researched.

Toxicity & Safety

Caryophyllene oxide carries a low flag. It is a widespread dietary and fragrance sesquiterpene with no signal of acute toxicity at ordinary exposures, and its parent β-caryophyllene is an FDA-recognised GRAS flavouring; the honest caveats are the general ones for concentrated essential-oil constituents plus the specific fact that a dedicated human safety dataset for the isolate does not exist.

Safety at a Glance

✅ Low / no toxicityAllergy risk

• Low-toxicity dietary/fragrance sesquiterpene. A common minor food and essential-oil volatile with no acute-toxicity signal at normal exposure; closely tied to the GRAS flavouring β-caryophyllene.
• Not a validated medicine. The anticancer and analgesic results are preclinical (cells and rodents) at concentrations with no established human counterpart — this is research signal, not demonstrated benefit or a dosing basis ^{4,7Reference 4Park KR et al. · 2011Park KR, et al. (2011). β-Caryophyllene oxide inhibits growth and induces apoptosis through the suppression of PI3K/AKT/mTOR/S6K1 pathways and ROS-mediated MAPKs activation. Cancer Letters. https://pubmed.ncbi.nlm.nih.gov/21924548/View study →Reference 7Delgado C et al. · 2021Caryophyllene oxide, the active compound isolated from leaves of Hymenaea courbaril L. (Fabaceae) with antiproliferative and apoptotic effects on the PC-3 androgen-independent prostate cancer cell lineView study →}.
• Concentrated oils ≠ whole plants. Meaningful exposure comes from essential oils and extracts, where sesquiterpenes are far more concentrated than in the herb; “natural” does not mean risk-free at oil-level doses.
• Possible additive anti-platelet effect. In-vitro anti-platelet activity means a theoretical, unquantified caution alongside anticoagulant/antiplatelet drugs at high concentrated-oil intakes ^{6Reference 6Lin WY et al. · 2003Anti-platelet aggregation and chemical constituents from the rhizome of Gynura japonicaView study →}.

Reproductive and developmental safety data for isolated caryophyllene oxide are limited, and no isolate-specific verdict is issued here. Pregnancy and lactation are per-herb / per-supplement decisions made where intake is decided (the herb or product page), not on this molecule page.

Dosage

There is no established or recommended human dose for isolated caryophyllene oxide. The only quantified figures in the literature are preclinical rodent research doses — for example the 12.5–25 mg/kg used in the analgesic/anti-inflammatory study ^{2Reference 2Chavan MJ et al. · 2010Analgesic and anti-inflammatory activity of caryophyllene oxide from Annona squamosa L. barkView study →} — which are not convertible to human self-dosing. Real-world human exposure is dietary (a minor natural flavour volatile) and via essential oils and cured plant material, where its level rises with oxidation of the parent β-caryophyllene. These are research figures, not a personal recommendation.

References

1. Russo EB (2011). Taming THC: potential cannabis synergy and phytocannabinoid-terpenoid entourage effects. British Journal of Pharmacology. https://pubmed.ncbi.nlm.nih.gov/21749363/
2. Chavan MJ, Wakte PS, Shinde DB (2010). Analgesic and anti-inflammatory activity of caryophyllene oxide from Annona squamosa L. bark. Phytomedicine. https://pubmed.ncbi.nlm.nih.gov/19576741/
3. Espinosa-Juárez JV, et al. (2024). Synergistic antinociceptive effect of β-caryophyllene oxide in combination with paracetamol, and the corresponding gastroprotective activity. Biomedicines. https://pubmed.ncbi.nlm.nih.gov/38790999/
4. Park KR, et al. (2011). β-Caryophyllene oxide inhibits growth and induces apoptosis through the suppression of PI3K/AKT/mTOR/S6K1 pathways and ROS-mediated MAPKs activation. Cancer Letters. https://pubmed.ncbi.nlm.nih.gov/21924548/
5. Kim C, et al. (2014). β-Caryophyllene oxide potentiates TNFα-induced apoptosis and inhibits invasion through down-modulation of NF-κB-regulated gene products. Apoptosis. https://pubmed.ncbi.nlm.nih.gov/24370994/
6. Lin WY, et al. (2003). Anti-platelet aggregation and chemical constituents from the rhizome of Gynura japonica. Planta Medica. https://pubmed.ncbi.nlm.nih.gov/14531028/
7. Delgado C, Mendez-Callejas G, Celis C (2021). Caryophyllene oxide, the active compound isolated from leaves of Hymenaea courbaril L. (Fabaceae) with antiproliferative and apoptotic effects on the PC-3 androgen-independent prostate cancer cell line. Molecules. https://pubmed.ncbi.nlm.nih.gov/34684723/
8. Fidyt K, et al. (2016). β-Caryophyllene and β-caryophyllene oxide — natural compounds of anticancer and analgesic properties. Cancer Medicine. https://pubmed.ncbi.nlm.nih.gov/27696789/
9. Di Sotto A, et al. (2020). Chemopreventive potential of caryophyllane sesquiterpenes: an overview of preliminary evidence. Cancers. https://pubmed.ncbi.nlm.nih.gov/33081075/
10. Rice S, Koziel JA (2015). Characterizing the smell of marijuana by odor impact of volatile compounds: an application of simultaneous chemical and sensory analysis. PLoS One. https://pubmed.ncbi.nlm.nih.gov/26657499/
11. Hubbell SP, Wiemer DF, Adejare A (1983). An antifungal terpenoid defends a neotropical tree (Hymenaea) against attack by fungus-growing ants (Atta). Oecologia. https://pubmed.ncbi.nlm.nih.gov/28310690/
12. Giuliani C, et al. (2017). Secretory structures and essential oil composition in Stachys officinalis (L.) Trevisan subsp. officinalis (Lamiaceae) from Italy. Natural Product Research. https://pubmed.ncbi.nlm.nih.gov/27931115/

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