We conducted studies involving 15 volun- teers to test the relative efficacy of seven botanical insect repellents; four products containing N,N-diethyl- m-toluamide, now called N,N-diethyl-3-methylben- zamide (DEET); a repellent containing IR3535 (ethyl butylacetylaminopropionate); three repellent-impreg- nated wristbands; and a moisturizer that is commonly claimed to have repellent effects. These products were tested in a controlled laboratory environment in which the species of the mosquitoes, their age, their degree of hunger, the humidity, the temperature, and the light–dark cycle were all kept constant.