Plant Cinnamomum cassia (CEO) Mentha piperita (MEO) Allium sativum (AEO)
Organ Leaves, Branches Leaves Pods
Essential oil Composition Cinnamaldehyde 79.9% Menthol 32.5% Diallyl disulphides 53.5%
o-Methoxy cinnamaldehyde 8% (DL)-Menthone 26.5% Diallyl trisulphides 9.4%
Cinnamyl acetate 2.5% Menthyl acetate 4.9% Diallyl sulphides 6.9%
Coumarin 1.5% Eucalyptol 4.7% Propene 6.7%
Benzaldehyde 0.8% Isomenthone 4.1%  
Styrene 0.2% β-caryophyllen 3.7%
Cinnamic alcohol 0.1% D-neomenthol 3.2%
Cinnamic acid 0.1% D-limonen 3.2%
D-limonen 0.04% α/β-pinen 2.6%
    Menthofuran 2.4%
Pulegone 1.6%
Table 1: Main components (%) detected by GC-MS in the three EOs tested.