Cinnamic acid is a phenylpropanoid acid associated with cinnamon materials, balsams, and cinnamate chemistry across the AromaForge archive. In the archive context it appears more as a balsamic marker constituent than as a strongly odor-dominant volatile. The public evidence base supports strong identity and occurrence data, a growing but still mostly preclinical anti-inflammatory literature, and practical safety language centered on irritation rather than fragrance-style dermal limits for isolated constituent use.
Chemical identity and composition
PubChem identifies cinnamic acid as C9H8O2 (CID 444539), typically represented in the trans or E configuration in natural-product and fragrance literature. It is also a central biosynthetic intermediate in phenylpropanoid metabolism and a precursor to several cinnamate esters found elsewhere in the archive.
Aroma and practical use
- Use the recorded balsamic, honey-like, warm, faintly spicy 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 recent mouse pleurisy study reported that trans-cinnamic acid reduced protein-rich exudate formation, neutrophil infiltration, and inflammatory mediators.
The PMC snippet states pretreatment with trans-cinnamic acid significantly inhibited LPS-induced pleurisy in mice.
This experimental finding does not establish benefit, dose or safety in people using this blend.
A high-fat-diet mouse study reported that cinnamic acid attenuated peripheral and hypothalamic inflammation.
The PMC snippet reports suppressed peripheral inflammation together with lower hypothalamic inflammatory signals in obese mice.
This experimental finding does not establish benefit, dose or safety in people using this blend.
A mechanistic glial-cell study reported SOCS3 upregulation by cinnamic acid via CREB-CBP signaling.
The PMC snippet states cinnamic acid upregulated the anti-inflammatory molecule SOCS3 in microglia and astroglia.
This experimental finding does not establish benefit, dose or safety in people using this 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.
recorded reference · RIFM fragrance ingredient safety assessment, cinnamic acid, CAS 621-82-9 (human maximization test, no sensitization at 4%)Public safety sheets and government assessments describe cinnamic acid more as a skin, eye, or respiratory irritant concern than as a phototoxic constituent.
The source assessment applies to its specified exposure and preparation; this entry is not an unrestricted-use clearance.
A RIFM fragrance ingredient safety assessment (CAS 621-82-9) concluded, based on weight of evidence from structural analysis, in-vitro data, and animal and human studies, that cinnamic acid does not present a concern for skin sensitization under current declared use levels; a 1976 human maximization test recorded no sensitization reactions at 4% (2760 micrograms/cm2).
The source assessment applies to its specified exposure and preparation; this entry is not an unrestricted-use clearance.
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.
(E)-cinnamaldehydeAmplification 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)-cinnamaldehyde report →How the effects were investigated
modulation of inflammatory signaling
Recent mouse and mechanistic studies describe reduced inflammatory cell infiltration and lower inflammatory signaling after trans-cinnamic acid exposure.
This experimental finding does not establish benefit, dose or safety in people using this blend.
SOCS3 upregulation in glial cells
An open-access mechanistic paper reported that cinnamic acid upregulated SOCS3 in microglia and astroglia through a CREB-CBP pathway.
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 (5)
- Most positive efficacy signals remain preclinical, so the file avoids medical-claim framing.
- Much of the broader literature discusses cinnamic acid derivatives rather than isolated cinnamic acid itself.
- The RIFM assessment locator is a PDF that returned a server error on direct fetch during this pass; the finding is corroborated via indexed search-result text rather than a directly re-read full document.
- 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.