NOTE: Always use an ultrasonic diffuser (with a diffusing duration of at least 8 hours), to diffuse pure essential oils. Do not use a humidifier, air purifier, or a candle, as they only smell good and have no further effect. An electric, ultrasonic, diffuser dispenses essential oils into the air through vibrations of a plate which causes ultrasonic waves, creating microscopic particles of oils that disperse into the air. It, therefore, breaks open the essential oil volatile molecules, to have a medicinal effect in that it can penetrate through the blood-brain barrier. It is always good to use a diffuser at night while you are sleeping.