Cinnamon essential oil contains a number of compounds thought to influence health. These compounds include cinnamaldehyde, which has been found to reduce inflammation and act as an antimicrobial (a substance that destroys or suppresses the growth of microorganisms, including bacteria and fungi). Cinnamon essential oil is touted as a natural remedy for health concerns ranging from cough and colds to constipation. In addition, cinnamon essential oil is said to stimulate circulation, reduce stress, relieve, fight off infections, improve digestion, and protect against insects.