This is one of dōTERRA's most popular essential oils-- On Guard is a blend of Wild Orange, Clove Bud, Cinnamon, Eucalyptus, and Rosemary essential oils, and its designed with the purpose to support a healthy immune and respiratory system, protect against environmental threats, and promote healthy circulation.
 
This oil works equally well diffused, ingested, or applied topically on skin with Fractionated Coconut Oil (for skin sensitivity). 
 
dōTERRA has further developed this oil into its own line of products: Foaming Hand Wash, Natural Whitening Toothpaste, Throat Drops, Beadlet Supplements, and an All-Purpose Surface Cleanser.
 
However, you can also create your own hand soap or surface cleanser using this oil. It naturally sanitizes surfaces and purifies the air. On Guard can protect against illness when used regularly, by both boosting the immune system, and sanitizing against bacteria and toxins.
 
Although it is always advised to check with your doctor first, generally it is acceptable to use On Guard while pregnant, nursing, or with small babies and children. If you are concerned, use On Guard in a diffuser instead of ingesting or topically.
 
I personally add one drop of On Guard to a bottle of water daily-- it tastes and smells like mulled wine: woodsy, citrusy, a little spicy. I'd be happy to answer any questions you have about this amazing oil blend!