Simplify the following text for a Grade 8 native English-speaking person.
Original: It also has insect repellent properties ( Jahn 1991 a , b ; 1992 ) , and is an active ingredient in some commercial mosquito repellents ( Fradin & Day 2002 ) .
Simplified: Eucalyptus oil is an insect repellent ( Fradin & Day 2002 ) .