Lavander Oil is a non-toxic and non-sensitizing liquid obtained from the steam distillation method. The oil is used in massage therapy because of its floral aroma. What is lavender oil used for? Lavender essential oil is one of the most popular and versatile essential oils used in aromatherapy. Distilled from the plant Lavandula angustifolia, the oil promotes relaxation and believed to treat anxiety, fungal infections, allergies, depression, insomnia, eczema, nausea, and menstrual cramps.