trans-Isocitral is the E-isomer within the isocitral aldehyde group and appears in AromaForge most clearly as a minor but consistent companion to citral in lemon myrtle. Live sources support strong identity and safety data: NIST provides the isomer-level identity, IFRA and RIFM treat 3,7-dimethyl-3,6-octadienal as a restricted fragrance material because of dermal sensitization and systemic-toxicity considerations, and open literature shows E-isocitral recurring in other citral-rich essential oils. Direct standalone efficacy literature is limited, so this record should stay anchored to occurrence, odor, and safety context rather than benefit claims.
Chemical identity and composition
NIST identifies (E)-3,7-dimethyl-3,6-octadienal as the same structure as isogeranial and lists exo-iso-citral and (E)-iso-citral among its names. In the archive it is documented at 2.37% in lemon myrtle, and a 2003 human-skin absorption paper on lemon myrtle oil reported a similar trans-isocitral level of 2.6%, supporting that this is a recurring minor constituent of citral-type Backhousia citriodora oil rather than a one-off annotation.
Aroma and practical use
- Use the recorded green, lemony, aldehydic, fresh, citrus 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.
A 2022 Molecules study reported E-isocitral at 3.2-4.7% in citral-rich Cinnamomum camphora and Cinnamomum bodinieri essential oils and found antioxidant activity significantly correlated with oxygenated monoterpenes at the whole-oil level.
The paper links antioxidant performance to the oxygenated-monoterpene-rich oil mixtures rather than isolating trans-Isocitral as the sole active compound.
This experimental finding does not establish benefit, dose or safety in people using this blend.
A 2003 human-skin study on lemon myrtle oil characterized the test oil as 96.6% citral with minor trans-isocitral at 2.6% and found no detectable components in receptor media during the in vitro percutaneous absorption experiment.
This is oil-level safety context rather than a constituent-isolated exposure study, but it provides directly relevant archive-occurrence and topical-use framing.
The source assessment applies to its specified exposure and preparation; this entry is not an unrestricted-use clearance.
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 attachedIFRA Amendment 49 sets finished-product restrictions for 3,7-dimethyl-3,6-octadienal and states that the natural contribution is determined by the sum of its isomers.
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.
The RIFM safety assessment concludes that 3,7-dimethyl-3,6-octadienal is not expected to be genotoxic or phototoxic/photoallergenic at reviewed use levels and treats it as a weak skin sensitizer with a WoE NESIL of 7000 microg/cm2.
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.
Because the strongest directly readable evidence centers on safety and mixture context, copy should avoid implying isolated therapeutic or antimicrobial effects for trans-Isocitral itself.
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
weak_skin_sensitizer_read_across_profile
The RIFM safety assessment for 3,7-dimethyl-3,6-octadienal classifies the material as a weak skin sensitizer using read-across from citronellal and related structure-based assessment.
The source assessment applies to its specified exposure and preparation; this entry is not an unrestricted-use clearance.
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 (5)
- Most public sources treat isocitral as an isomer group or as 3,7-dimethyl-3,6-octadienal broadly, so purely trans-specific biological data remain sparse.
- This pass did not verify a human clinical study centered on isolated trans-Isocitral alone.
- The strongest accessible activity evidence is mixture-level and does not cleanly separate trans-Isocitral from citral, cis-isocitral, or the broader oxygenated-monoterpene background.
- 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.