Three of our best-selling pure essential oils in a great value gift-box, the perfect oils to help treat colds and flu naturally. The ECO. Fight the Flu Aroma Trio contains: Eucalyptus Essential Oil: with a fresh, woody, sweet scent, Eucalyptus Essential Oil is deep cleansing, reduces redness and irritation and helps treat colds & flu. Sinus Clear Essential Oil Blend: a clearing blend of lemongrass, lime, grapefruit & peppermint to help treat the symptoms of hay fever, sinus, colds & flu. Tea Tree Essential Oil: with its fresh and antiseptic scent, Tea Tree Essential Oil is wonderful for fighting infections and skin irritation.