The most effective repellents contain DEET
(N,N-diethyl-m-toluamide), which is an ingredient used to repel
pests like mosquitoes and ticks. DEET has been tested against a
variety of biting insects and has been shown to be very
The more DEET a repellent contains the longer time it can
protect you from mosquito bites. A higher percentage of DEET in a
repellent does not mean that your protection is better, just that
it lasts longer.