CONSTITUENT REPORT
(E)-cinnamaldehyde
(E)-cinnamaldehyde, also called trans-cinnamaldehyde, is the dominant spicy aldehyde in cinnamon bark and cassia oils and one of the most safety-relevant constituents in the AromaForge archive. Public literature is broad but uneven: identity, fragrance-safety, irritancy, and preclinical antimicrobial or inflammation-linked studies are easy to verify, while isolated human therapeutic evidence remains limited. Archive copy should therefore present trans-cinnamaldehyde as a major cinnamon marker with strong sensory identity, meaningful preclinical mechanism literature, and clear dermal-sensitization caution rather than as a direct medical ingredient.
Chemical identity and composition
NIST identifies the archived constituent as cinnamaldehyde, (E)- with formula C9H8O, while PubChem lists cinnamaldehyde under CID 637511 and includes trans-cinnamaldehyde among its names. The archive ID merges two common labels for the same predominant stereoisomer: '(E)-cinnamaldehyde' and 'trans-cinnamaldehyde'. In aromatic materials it is the characteristic hot-sweet aldehyde associated with cinnamon bark and cassia profiles.
Aroma and practical use
- Use the recorded spicy, warm, sweet, cinnamon-like 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 2016 in vivo study reported that cinnamaldehyde modulated LPS-induced systemic inflammatory responses in mice, with the paper explicitly testing whether the effect depended on TRPA1 activation.
This supports a real preclinical inflammation-linked literature base while still remaining far short of human clinical proof.
This experimental finding does not establish benefit, dose or safety in people using this blend.
A 2017 mouse study found that cinnamaldehyde reduced fasting glucose, improved insulin sensitivity, and improved islet morphology and vascular-endothelium-related measures in db/db mice.
This is useful as a preclinical metabolism signal, but it should not be presented as a validated human outcome.
This experimental finding does not establish benefit, dose or safety in people using this blend.
A 2019 RIFM fragrance safety assessment concluded that existing information supports the use of cinnamaldehyde under current fragrance use conditions after review of genotoxicity, repeated-dose, developmental, respiratory, phototoxicity, and skin-sensitization data.
This is the clearest safety-oriented umbrella source for constituent-level use context, but it does not negate cinnamaldehyde's irritation and sensitization relevance.
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 attachedCinnamaldehyde has a strong sensitization and irritation reputation in fragrance and essential-oil safety literature, which is why cinnamon bark and cassia materials are typically treated very conservatively on skin.
The source assessment applies to its specified exposure and preparation; this entry is not an unrestricted-use clearance.
The 2005 toxicologic and dermatologic assessment and the 2019 RIFM review both support cautious regulated fragrance use rather than unrestricted direct-contact use.
The source assessment applies to its specified exposure and preparation; this entry is not an unrestricted-use clearance.
No isolated human clinical efficacy literature sufficient for medical-style claims about trans-cinnamaldehyde was verified in this pass.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
Constituents it may interact with
These are research candidates recorded in the interaction matrix. They do not add a proven-amplification bonus to the score.
cinnamic acidAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
in vitro · effect
No source citation attached.
Read cinnamic acid report →citralAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
in vitro · effect
No source citation attached.
Read citral report →CarvacrolAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
in vitro · effect
No source citation attached.
Read Carvacrol report →ThymolAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
in vitro · effect
No source citation attached.
Read Thymol report →(E)-o-MethoxycinnamaldehydeAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
in vitro · effect
No source citation attached.
Read (E)-o-Methoxycinnamaldehyde report →NeralAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
in vitro · effect
No source citation attached.
Read Neral report →geranialAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
in vitro · effect
No source citation attached.
Read geranial report →EugenolAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
in vitro · effect
No source citation attached.
Read Eugenol report →How the effects were investigated
TRPA1 agonism and irritant sensory signaling
Cinnamaldehyde is a well-known TRPA1 agonist, which helps explain its pungent sensory profile and some of its irritation-linked biological effects.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
antimicrobial and antibiofilm interference
Recent reviews and experimental studies describe cinnamaldehyde as interfering with microbial growth, adhesion, and biofilm formation in several in vitro systems.
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)
- Most directly accessible cinnamaldehyde efficacy literature is preclinical, especially animal, cell, or microbial-system work.
- A constituent-specific human aroma-use or topical-use clinical evidence base was not verified in this pass.
- Because trans-cinnamaldehyde is strongly irritant-relevant, archive copy should remain especially careful not to blur preclinical findings into wellness claims.
- 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.
- Interaction candidates lack an attached source citation and remain unqualified.