Cinnamon essential oil when used as aromatherapy, can help as a physical, emotional and mental stimulant, relieve headaches and more. The oil also has anti-viral, anti-fungal and anti-bacterial properties and boosts the immune system. Cinnamon oil is very powerful and can irritate the skin, so only small amounts are suggested, or use with a carrier oil, or use in a diffuser to scent the room.