Does it work?

For centuries, fennel fruits have been used as herbal medicines in Europe and China. Fennel tea is often used to treat infants with digestive disorders. It has a mild flavor and seems to be well-tolerated. An emulsion of fennel seed oil and an herbal tea containing fennel have been shown to reduce infantile colic. Additional studies are warranted in order to confirm these findings.

Dangers and possible side effects...

Avoid if allergic or hypersensitive to fennel or other members of the Apiaceae family. Fennel is generally well-tolerated. However, serious allergic reactions may occur. Use cautiously with diabetes. Avoid with epilepsy. Avoid in infants and toddlers. Avoid if pregnant or breastfeeding.