Shield can be used as a general antimicrobial, anti-pathogen tonic. It is an improved version of the Young Living, Theives blend which contains Cinnamon bark Oil, Eucalyptus, Lemon, Rosemary, and Clove Bud essential Oils. The Sheild recipe has Cinnamon Leaf oil in place of the Cinnamon bark, which can be very harsh when breathed in vapor form. Eucalyptus Smithii is used as a lighter form of Eucalyptus that is better suited when used around children. Thyme oil was added which is a very strong, refreshing and stimulating aroma that is also very good at destroying pathogens.