alpha-Selinene is a sesquiterpene hydrocarbon found across wood, leaf, root, and citrus-adjacent aromatic materials, but its standalone evidence base is much thinner than that of better-studied oxygenated terpenes. Current source support is strongest for identity and occurrence, with only mixed-oil or chemometric studies linking alpha-Selinene to antimicrobial or related bioactivity signals. For AromaForge, it is most accurate to treat alpha-Selinene as a chemistry and aroma constituent with exploratory mixture-level bioactivity context and substantial standalone evidence gaps.
Chemical identity and composition
PubChem identifies alpha-Selinene as C15H24 and describes it as a selinene isomer with an endocyclic double bond in the octahydronaphthalene ring system. In the archive it appears in several nontrivial amounts, including 6.6% in the Cyperus rotundus 'Cypress Round Redistilled' record, 6.41% in manuka, and a reported 0.45-3.71% range in agarwood.
Aroma and practical use
- Use the recorded woody, spicy, dry, herbal, herbaceous 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.
helichrysum antimicrobial mixture model
A 2024 Antibiotics paper reported that alpha-Selinene was among the compounds identified by artificial neural network modeling as contributing to the antimicrobial activity of Helichrysum italicum essential oil, alongside many other constituents.
Measured: antimicrobial activity attribution within a complex oil
This experimental finding does not establish benefit, dose or safety in people using this blend.
litsea linii major constituent
A 2010 composition study reported alpha-Selinene at 15.5% in Litsea linii leaf oil, identifying it as one of the dominant sesquiterpenes in that plant profile.
Measured: major constituent occurrence
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
magnolia braianensis occurrence
A 2025 Chem Biodiversity study reported alpha-Selinene as the major constituent at 17.9% in Magnolia braianensis leaf oil, while the whole oil showed limited antimicrobial activity against only a subset of tested strains.
Measured: major constituent occurrence
This reference does not establish a therapeutic result or a safe use level for a custom oil 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 attachedNo authoritative standalone toxicology review, IFRA limit, or clinical safety monograph for isolated alpha-Selinene was verified in the reviewed public sources.
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.
Because the accessible activity evidence is mainly mixture-level, any wellness-facing copy should avoid implying direct antimicrobial or antioxidant effects for isolated alpha-Selinene.
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
atp ase binding prediction in mixture modeling
In a recent Helichrysum italicum study, alpha-Selinene appeared among compounds implicated by chemometric analysis and in silico ATP-ase-focused modeling as contributors to mixture antimicrobial activity.
This experimental finding does not establish benefit, dose or safety in people using this blend.
No direct public citation is attached to this entry.
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 for isolated alpha-Selinene were located in this pass.
- Most accessible biological findings attribute activity to whole oils, not purified alpha-Selinene dose-response studies.
- Constituent-specific dermal, inhalation, and long-term toxicology evidence remains sparse in public sources.
- 2026-07-13 re-verification (worker c3): a targeted search for IFRA/Tisserand dermal limit and sensitization/phototoxicity data for alpha-selinene (CAS 473-13-2) returned only supplier SDS listings with no numeric safety values; dermal_limit_verified remains false.
- 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.