Cinnamaldehyde là aldehyde thơm chiếm 65-80% dầu vỏ quế and is responsible for cinnamon's characteristic sweet, warm, spicy flavour and aroma. Commercially produced by distillation of cassia oil or by chemical synthesis.
Được dùng trong tạo hương thực phẩm, bảo quản kháng khuẩn (effective against E. Coli, Salmonella), fragrance, animal feed and agricultural fungicide applications.