Combine 1 drop of On Guard, 1 drop of Lemon Essential Oil and 2 tsp. of carrier oil together. Massage the blend on neck, chest and bottoms of the feet. Repeat every 3-4 hours until your little one feels their best. Tip: Layer with Frankincense Touch and apply along the spine. Tags: on guard doterra uses, on guard essential oil, on guard recipe diy, immune system, immune system boosters, immune boosting diffuser blends, kids immune booster, kids immunity roller.