Medicinal plants and their phytochemicals are used traditionally to cure diseases. Cuminaldehyde is an essential oil of a natural organic compound mostly found in plants like Cuminum cyminum, Cinnamomum verum, Carum carvi, Cinnamomum cassia and Bunium persicum, and has shown anticancer, antiplatelet, antibacterial, antifungal, antidiabetic, antimalarial and ameliorating symptoms of Parkinson’s disease. Essential oils are less dangerous than chemical medicines. Cumin (Cuminum cyminum) commonly known as Jeera is used in the household flavoring agents, native from East Mediterranean to the Indians. The most important chemical composition of the cumin essential oil was cuminaldehyde. Cinnamomum verum, Cuminum cyminum both plant seed used as a conventional Chinese herbal medicine, particularly a cuminaldehyde, an important herbal medicine found in true cinnamon tree’s bark shows anticancer effect.