This blend of 100% pure, steam distilled organic essential oils is intended for use in rooms that have a history of mold. When used over a period of weeks, the mist creates an invisible shield that inhibits mold growth. The spores may still be there, but the oils discourage the mold from becoming vegetative. Of course, the oils smell very nice so this blend can be used to improve the smell in a room. The oils can be inhaled but the recommended amount is 3-5 minutes of inhalation. This length of time is not adequate for mold protection so the rooms should be vacant most of the time when diffusing for hours or days on end. For best results, use a diffuser with ultrasonic vibration and a timer.