Essential oil
In one comparative study from 2004, ethyl butylacetylaminopropionate was as effective or better than DEET in protection against "Aedes aegypti" and "Culex quinquefasciatus" mosquitoes. Other sources (official publications of the associations of German physicians as well as of German druggists) suggest the contrary and state DEET is still the most efficient substance available and the substance of choice for stays in malaria regions, while ethyl butylacetylaminopropionate has little effect. However, some plant-based repellents may provide effective relief as well. Essential oil repellents can be short-lived in their effectiveness.