There are several alternatives to DEET for insect repellent, including picaridin, IR3535, and oil of lemon eucalyptus. Picaridin is a popular alternative to DEET as it is just as effective and has a milder scent. IR3535 is also effective and has a lower toxicity level than DEET. Oil of lemon eucalyptus is a natural alternative to DEET and can be just as effective.