alpha-p-Dimethylstyrene is an aromatic hydrocarbon also known as dehydro-p-cymene or p-cymenene. In AromaForge context it is mainly a flavor-fragrance and occurrence marker rather than a wellness-active constituent: live sources support its identity, regulatory flavor listing, odor profile, and presence in some citrus, parsley, and labdanum-style materials. The evidence base for direct biological effects is thin, so this record is best framed around chemistry, aroma, and safety context rather than health-oriented claims.
Chemical identity and composition
PubChem lists alpha-p-dimethylstyrene as CID 62385 with formula C10H12 and IUPAC name 1-methyl-4-prop-1-en-2-ylbenzene. NIST and FAO/JECFA align on CAS 1195-32-0 and the synonym set includes dehydro-p-cymene, p-cymenene, and 1-isopropenyl-4-methylbenzene. In the archive it appears at 1.60% in a labdanum-rockrose COA, and external references also note occurrence among volatile flavor constituents of litchi, distilled Mexican lime, and parsley.
Aroma and practical use
- Use the recorded phenolic, spicy, burnt-wood, roast-coffee descriptors to explore a blend's scent character; perceived strength also depends on the other ingredients.
- 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 1985 Journal of Agricultural and Food Chemistry paper specifically studied inhibition of alpha-p-dimethylstyrene and p-cymen-8-ol formation in a carbonated citral-containing beverage system, placing the compound in flavor-degradation chemistry rather than therapeutic research.
A 1985 Journal of Agricultural and Food Chemistry paper specifically studied inhibition of alpha-p-dimethylstyrene and p-cymen-8-ol formation in a carbonated citral-containing beverage system, placing the compound in flavor-degradation chemistry rather than therapeutic research.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
A 2021 perfume lemon essential-oil paper reported alpha,p-dimethylstyrene at 0.20% in the fruit oil profile while absent from the leaf oil profile in that dataset.
A 2021 perfume lemon essential-oil paper reported alpha,p-dimethylstyrene at 0.20% in the fruit oil profile while absent from the leaf oil profile in that dataset.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
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 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 attachedFAO/JECFA flavoring details list alpha-p-dimethylstyrene under JECFA number 1333 and show a full specification entry with latest evaluation at session 63, but this should not be read as a general-purpose cosmetic safety clearance.
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.
Trade references warn that the material oxidizes and slowly polymerizes in the presence of air, so storage and handling claims should stay conservative.
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.
No isolated human clinical literature, constituent-specific dermal limit, or robust aromatherapy-style safety dataset was located 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.
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
oxidation and polymerization liability
Trade and flavor references consistently note that alpha-p-dimethylstyrene oxidizes and slowly polymerizes in air, which is the clearest practical handling mechanism signal found in this pass.
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.
formation in citral degradation systems
A beverage-chemistry paper examined inhibition of alpha-p-dimethylstyrene formation in a carbonated citral system, indicating the compound can arise as a process-generated volatile under flavor-degradation conditions.
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.
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 direct human clinical evidence was located for isolated alpha-p-dimethylstyrene.
- The located literature is much stronger for flavor chemistry, occurrence, and regulatory listing than for biological mechanism research.
- No constituent-specific IFRA-style dermal use limit was verified in this pass.
- A targeted 2026-07-13 search of Tisserand & Young Essential Oil Safety references, IFRA Standards, EU Cosmetics Regulation Annex III, and peer-reviewed toxicology literature found no authoritative constituent-specific dermal limit or sensitization dataset for alpha-p-dimethylstyrene/p-cymenene (CAS 1195-32-0). Supplier SDS listings note general Eye Irritant 2 / Skin Irritant 2 GHS classification but do not establish a specific fragrance dermal use limit, so the existing dermal_limit_pct (0.1%) and sensitizing:null remain unverified estimates.
- 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.