Expedition Natural is nature’s most effective natural repellent. The active ingredient PMD Citriodiol is derived from the oil of the Eucalyptus citriodora tree, which is a natural and renewable resource grown in several parts of the world. Each application provides up to 8 hours of protection from biting mosquitoes and is suitable for use on children over 6 months of age. Expedition Natural mosquito repellent has been proven by scientific research to repel mosquitoes, as well as midges, gnats and ticks.