On Guard proprietary essential oil blend provides a natural and effective alternative to keep your family and home healthy. As one of dōTERRA’s best-selling blends, On Guard protects against environmental and seasonal threats with essential oils known for their positive effects on the immune system. On Guard can be taken internally on a daily basis to maintain healthy immune function as well as used on surfaces throughout the home as a disinfectant and non-toxic cleaner. When diffused, On Guard helps purify the air, supports healthy respiratory function, and can be very energizing and uplifting. Applied topically, On Guard provides cleansing and purifying benefits while promoting healthy circulation.