Cypress essential oil is a plant oil used mainly in aromatherapy. It has a crisp, woody scent that many people find refreshing and grounding. It is most often used by diffusing it or applying it topically after dilution with a carrier oil. While it is sometimes included in wellness and body-care products, it should not be described as a proven treatment for infections, circulation problems, respiratory disease, anxiety disorders, or other medical conditions. Essential oils can also irritate the skin or cause side effects, so they should be used carefully and kept away from the eyes, children, and pets.