Cinnamon Bark, Wild (Madagascar) Cinnamomum zeylanicum Cinnamon essential oil supports healthy metabolic function and helps maintain a healthy immune system. Cinnamon has many culinary uses, adding spice to desserts, entrées, and hot drinks. Due to its high content of cinnamaldehyde, Cinnamon should be diluted with a carrier oil when applied to the skin. Cinnamon also naturally repels insects.