what is fennel good for
1 Fennel tea is a mild diuretic and can help flush excess water and toxins out of the body. 2  Fennel seeds are very high in antioxidants, providing extra protection for your body against free radical cellular damage.ther Health Benefits of Fennel Tea. 1  Fennel tea is a mild diuretic and can help flush excess water and toxins out of the body. 2  Fennel seeds are very high in antioxidants, providing extra protection for your body against free radical cellular damage.