The most effective insect repellents are those that contain Deet. Concentrations of 30% Deet are probably adequate for most adults and a concentration of 10% or less works well for most children. It is important to follow the proper use recommendations on the label of products containing Deet and to ask your pediatrician before applying Deet to children <2yrs of age. When using sunscreen, we recommend that the sunscreen be applied first followed by the insect repellent containing Deet. Combination products that contain both Deet and sunscreen are not advised, as sunscreen often needs to be reapplied more frequently than the repellent.