Lavandin oil is extracted by steam distilling the plant stalks and flowers Lavandin oil is used in vapor therapies for treating colds and coughs. The essential oil may also be mixed in baths or blended with other oils for relieving muscle pain and clearing the lungs. Adding two to three drops of lavandin oil to your burner, diffuser, or bath may help relieve depression or sadness. Lavandin oil works as a great insect repellent – just apply it at the edge of your window to keep flies at bay. You can also ward off mosquitoes by rubbing it on your wrists.