dōTERRA On Guard, a proprietary essential oil blend, provides a natural and effective alternative for immune support when used internally, topically and aromatically. As one of dōTERRA’s best-selling blends, dōTERRA On Guard protects against environmental and seasonal threats with essential oils known for their positive effects on the immune system when ingested, applied topically and diffused. dōTERRA On Guard can be used on a daily basis to maintain healthy immune function and support healthy cardiovascular function as well. It can also be used on surfaces throughout the home as a non-toxic cleaner. When diffused, dōTERRA On Guard helps purify the air, and can be very energizing and uplifting.