alpha-Copaene is a sesquiterpene hydrocarbon found across many essential oils and plant volatile profiles. In AromaForge it is currently best supported as a woody sesquiterpene marker with notable chemical-ecology literature: published studies describe alpha-copaene as an attractant or repellent for several insect species depending on context and stereochemistry. That evidence is useful for mechanism and occurrence framing, but it does not translate into human therapeutic claims.
Chemical identity and composition
PubChem identifies alpha-copaene as C15H24. In the archive it appears in multiple oils, including helichrysum at 2.6% and manuka at 5.02%, consistent with its role as a recurrent sesquiterpene hydrocarbon in woody-herbal profiles.
Aroma and practical use
- Use the recorded woody, sweet, spicy descriptors to explore a blend's scent character; perceived strength also depends on the other ingredients.
- Review the flagged use concerns across every contributing oil and the selected dilution.
- Read the route, preparation and experimental context before using a study finding to choose an oil.
Reported benefits and effects
Findings retain their study context. An animal or laboratory result describes that experiment.
asian citrus psyllid repellency
A 2025 Scientific Reports paper reported that alpha-copaene repelled Asian citrus psyllids at doses about 100-fold lower than those needed for beta-caryophyllene, and that a blend containing alpha-copaene also repelled the insects.
Measured: repellency threshold and response to sesquiterpene blend
This experimental finding does not establish benefit, dose or safety in people using this blend.
tea shot hole borer attraction
A field study identified (-)-alpha-copaene as an attractant for the Florida tea shot-hole borer, with the alpha-copaene and quercivorol combination producing stronger detection than either lure alone and eliciting higher electroantennographic responses.
Measured: trap captures and antennal response
This experimental finding does not establish benefit, dose or safety in people using this blend.
olive fly oviposition related research
A Journal of Agricultural and Food Chemistry study found a positive correlation between alpha-copaene abundance and olive fruit infestation, and reported that increased (+)-alpha-copaene favored oviposition by olive fruit fly females whereas increased (-)-alpha-copaene did not significantly alter host preference.
Measured: correlation with infestation and enantiomer-specific oviposition preference
This experimental finding does not establish benefit, dose or safety in people using this blend.
biosynthetic context
A plant-biosynthesis paper identified alpha-copaene as a minor product of a sunflower multiproduct sesquiterpene synthase, helping place the constituent within documented terpene-biosynthetic pathways.
Measured: minor product identification
This experimental finding does not establish benefit, dose or safety in people using this blend.
Use concerns and concentration limits
Sensitization concernFlagged
Flagged in the constituent reference; assess the source, route and finished-product concentration.
Phototoxicity concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Oxidation concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Penetration enhancementNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
A recorded constituent reference, not a recommended oil dilution. Product category, source applicability and all contributing oils must be checked before use.
unverified reference · No source provenance attachedThe Good Scents Company snippet did not show a constituent-specific dermal limit or detailed toxicology reference for alpha-copaene.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
The reviewed literature centers on insect ecology and agricultural semiochemical effects, not on human topical or inhalation safety testing of isolated alpha-copaene.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
Constituents it may interact with
No constituent-pair interaction is recorded for this identity. The report does not assume either amplification or incompatibility.
How the effects were investigated
olfactory kairomone signaling
A PLoS One field and electroantennography study reported that female tea shot-hole borers chemoreceived alpha-copaene and that combining alpha-copaene with quercivorol improved trap performance.
This experimental finding does not establish benefit, dose or safety in people using this blend.
dose sensitive insect repellency
A 2025 Scientific Reports paper found alpha-copaene repelled Asian citrus psyllids at substantially lower doses than beta-caryophyllene in behavioral assays, supporting direct olfactory repellent activity in that insect system.
This experimental finding does not establish benefit, dose or safety in people using this blend.
What this report cannot establish
- A reported constituent percentage does not establish an effective human therapeutic dose or the amount absorbed into the body.
- The presence of a constituent does not guarantee a clinical benefit, rash treatment or sleep improvement from a custom blend.
- An unflagged concern or missing use limit does not establish safety for ingestion, inhalation, skin exposure or a particular person.
- A candidate constituent interaction does not establish that two oils amplify one another at the selected proportions.
- Constituent descriptors alone do not establish a precise top, heart or base lifetime in a finished blend.
Known data gaps (6)
- No human clinical studies specific to isolated alpha-copaene were located in the reviewed public sources.
- The strongest constituent-specific literature is chemical-ecology research in insects, so its relevance to topical or inhalation aroma use is indirect.
- Constituent-specific sensitization, dermal-limit, and phototoxicity data were not located in the reviewed public sources.
- Re-verification pass (2026-07-13, 2 searches): the ChemicalBook SDS for alpha-copaene (CAS 3856-25-5) explicitly lists dermal toxicity and skin sensitization data as 'not available'; no IFRA/Tisserand & Young/EU Annex III dermal limit was located. The existing dermal_limit_pct (25) and sensitizing (true) values remain unsourced placeholders and dermal_limit_verified is correctly left false; these values were left unchanged pending a citable source, per policy of not guessing or fabricating.
- The numeric dermal reference lacks source provenance; a verified flag alone is insufficient.
- Some findings do not record an explicit exposure route; consult the linked study before applying them to a use.