1,4-cineole is the less common cineole isomer and usually appears as a minor companion to 1,8-cineole in essential oils rather than as the main profile driver. Public constituent-level evidence is much thinner than for 1,8-cineole, but the accessible literature still supports a useful profile: it is a monoterpene oxide with a fresh cineolic aroma, food-flavor identity references, limited animal behavioral data, and sensory-channel activity that may contribute to cooling or pungent effects in cineole-containing oils.
Chemical identity and composition
1,4-cineole is an isomeric bicyclic ether with the same molecular formula as 1,8-cineole but a different bridge placement. JECFA's flavor specification explicitly treats commercial 1,4-cineole material as mostly the 1,4 isomer with the balance commonly represented by 1,8-cineole.
Aroma and practical use
- Use the recorded fresh, eucalyptus-like, herbaceous, cooling, terpenic descriptors to explore a blend's scent character; perceived strength also depends on the other ingredients.
- Compare the recorded goal signals with the intended purpose, while keeping model assumptions separate from observed study outcomes.
- 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.
A 2010 mouse study reported anxiolytic-like effects for 1,4-cineole, but the same paper also interpreted the pattern as consistent with general CNS depression.
The accessible abstract and search snippets report effects in elevated plus maze, hole board, open field, pentobarbital sleep, forced swim, and tail suspension models.
This experimental finding does not establish benefit, dose or safety in people using this blend.
A 2020 inhalation study reported that inhaled 1,8- and 1,4-cineole prevented anxiety- and depressive-like behaviors in mice.
The MDPI article gives the clearest openly accessible evidence for inhaled 1,4-cineole in classic mouse behavioral assays, but it remains preclinical evidence.
This experimental finding does not establish benefit, dose or safety in people using this blend.
How it contributes to goal calculations
Model markers guide the formulation score. They are separate from the source findings above.
Use concerns and concentration limits
Sensitization concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
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 enhancementFlagged
Flagged in the constituent reference; assess the source, route and finished-product concentration.
A recorded constituent reference, not a recommended oil dilution. Product category, source applicability and all contributing oils must be checked before use.
recorded reference · RIFM fragrance ingredient safety assessment, 1,4-cineole, CAS 470-67-7 (Food Chem Toxicol, 2019, https://fragrancematerialsafetyresource.elsevier.com/sites/default/files/470-67-7.pdf), Table 1: maximum acceptable concentration for IFRA Category 5 (products applied to face/body by hand, primarily leave-on) is 0.10% based on the non-reactive Dermal Sensitization Threshold (900 ug/cm2); human maximization test (RIFM, 1981) showed no sensitization reactions up to 16% (11040 ug/cm2).Screening assumption (verified). It is not a verified constituent-specific exposure limit.
model fallback · RIFM fragrance ingredient safety assessment, 1,4-cineole, CAS 470-67-7 (Food Chem Toxicol, 2019, https://fragrancematerialsafetyresource.elsevier.com/sites/default/files/470-67-7.pdf), Table 1: maximum acceptable concentration for IFRA Category 5 (products applied to face/body by hand, primarily leave-on) is 0.10% based on the non-reactive Dermal Sensitization Threshold (900 ug/cm2); human maximization test (RIFM, 1981) showed no sensitization reactions up to 16% (11040 ug/cm2).This pass did not locate a strong human safety dossier specific to isolated 1,4-cineole; treat it as a research constituent with limited direct exposure guidance.
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.
Commercial SDS material classifies 1,4-cineole as a handled chemical substance rather than a casual flavor note, supporting normal concentrate-level lab caution.
The source assessment applies to its specified exposure and preparation; this entry is not an unrestricted-use clearance.
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
activation of human TRPM8 and TRPA1
Accessible channel pharmacology reports 1,4-cineole activates both human TRPM8 and human TRPA1, which fits its cooling-pungent sensory behavior.
This experimental finding does not establish benefit, dose or safety in people using this blend.
possible CNS-depressant or anxiolytic-like behavioral action
Rodent behavior papers describe anxiolytic-like effects alongside signs consistent with broader CNS depressant action, so the interpretation should stay cautious.
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 (4)
- No high-quality human clinical trial specific to isolated 1,4-cineole was verified in this pass.
- Most accessible 1,4-cineole literature is animal, sensory, industrial, or specification focused rather than consumer safety focused.
- Second pass (2026-07-13): located the full-text RIFM (2019) fragrance safety assessment for CAS 470-67-7, which resolved the dermal ceiling gap (IFRA Category 5 leave-on limit 0.10%, DST-based) and confirmed sensitizing:false and phototoxic:false.
- Some findings do not record an explicit exposure route; consult the linked study before applying them to a use.