Aniseed oil is not only helpful for its effect on the digestive system, it is also a general tonic to the circulatory system and the respiratory tract. It helps to calm the nerves of tense and anxiety ridden people. It also may calm menstrual pains and eases nauseous migraines as well as allergies, bronchitis, winters ills and chills, coughs, flatulence, hayfever, muscle aches and rheumatism.