DEET is hard to beat. The chemical discovered over a half-century ago is still the best mosquito repellent--and safer than you might think.
D000818:Animals; D009033:Culicidae; D003671:DEET / Q000008:administration & dosage / Q000737:chemistry*; D004347:Drug Interactions; D006801:Humans; D007299:Insect Bites and Stings / Q000517:prevention & control*; D007302:Insect Repellents / Q000008:administration & dosage / Q000737:chemistry*; D013473:Sunscreening Agents / Q000008:administration & dosage
D007302:Insect Repellents; D013473:Sunscreening Agents; D003671:DEET