Fennel Benefits Rich in phytoestrogens, Fennel is often used for colic, wind, irritable bowel, kidneys, spleen, liver, lungs, suppressing appetite, breast enlargement, promoting menstruation, improving digestive system, milk flow and increasing urine flow. Fennel is also commonly used to treat amenhorrea, angina, asthma, anxiety, depression, heartburn, water retention, lower blood pressure, boost libido, respiratory congestion, coughs and has been indicated for high blood pressure and to boost sexual desire. Fennel is a useful addition to any of the Breast Enlargement herbs and has an impressive number of other health benefits. Fennel is also commonly used to treat amenhorrea, angina, asthma, heartburn, high blood pressure and to boost sexual desire. Fennel is a mild appetite suppressant and is used to improve the kidneys, spleen, liver and lungs. Fennel is an effective treatment for respiratory congestion and is a common ingredient in cough remedies.