Fennel for digestion: forms, evidence and precautions

The bulb and leaves are foods. Herbal monographs mainly concern dried fruit, often called seed. Tea, concentrated extract and essential oil are not interchangeable.

Sweet fennel fruit is traditionally used for mild spasmodic gastrointestinal complaints, including bloating and flatulence. Reviews of herbal dyspepsia treatments include heterogeneous combinations. The results of studied mixtures do not establish effects for fennel alone.

For food use, fennel is a condiment. For a medicinal preparation, check the botanical name, plant part, form and warnings. Essential oil is far more concentrated than tea and is not an equivalent.

Allergy is possible. As a precaution, medicinal fennel preparations are not recommended during pregnancy or breastfeeding because safety data are insufficient. Seek advice for persistent or worsening symptoms, bleeding, repeated vomiting, fever or weight loss.