Basic Ayurveda Sonf Ark is used for flavouring food and also as a medicine. Fennel seeds are used therapeutically due to expectorant, digestive stimulant and carminative properties. They are used as a home remedy to treat digestive problems, gas, bloating, colic, nausea, inflammation and cough. This Ark also can stimulate breast milk and is a useful remedy for breastfeeding mothers.