Murphy's Naturals 2 oz Lemon Eucalyptus Oil Insect Repellent Spray contains 30% oil of lemon eucalyptus — the only plant-based ingredient recommended by the Centers for Disease Control and Prevention (CDC). Repels mosquitoes and insects for up to 6 hours: repels mosquitoes that may transmit Zika virus, West Nile virus, Dengue virus and Chikungunya virus.