SHEET /m/cinnamaldehyde · PubChem CID 637511 · CAS 104-55-2 · REV 2026.07
Cinnamaldehyde
from sourceC9H8O · 132.16 g/mol
cinnamic aldehyde · trans-Cinnamic aldehyde · Benzylideneacetaldehyde · Cinnamyl aldehyde
What is Cinnamaldehyde?
The molecule that is cinnamon. It is most of the essential oil of cassia bark and the reason cinnamon feels warm as well as smelling sweet. from source
Fig. 1 · 2D structure RDKit
C1=CC=C(C=C1)/C=C/C=OThe dose makes the poison inferred
A reported rat oral LD50 for Cinnamaldehyde is 3,400 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
“The dose makes the poison” is a cross-species estimate shown as neutral science, not a threshold anyone should act on. Real toxicity depends on the person, not body mass alone.
Toxicity & hazards
Toxicity · LD50
3,400 mg/kg · very low toxicity · LD50 rat oral from source
The dose lens above scales this to a body weight.
3 more reported values
- 200 mg/kgLD50 · oral · mouse
- 75 mg/kgLD50 · iv · mouse
- 200 mg/kgLD50 · other · mouse
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