Lemon eucalyptus is a tree. Oil from the leaves is applied to the skin as a medicine and insect repellent.
Lemon eucalyptus oil is used for preventing mosquito and deer tick bites; for treating muscle spasms, toenail fungus (onychomycosis), and osteoarthritis and other joint pain. It is also an ingredient in chest rubs used to relieve congestion.
Lemon eucalyptus oil contains a chemical that repels mosquitoes and kills fungus.