Can I Use Fennel to Relieve PMS Symptoms?

Fennel’s anise-like flavor may not be everyone’s cup of tea, but sipping infusions made from the herb can significantly reduce the duration and severity of menstrual cramps, thanks to its ability to reduce prostaglandins. These hormone-like com­pounds are most active during the beginning of menstruation, and they’re responsible for menstrual cramps: They cause the contractions that help the body shed the uterine lining.

A 2020 review of randomized controlled trials concluded that fennel is as effective as conventional medications at relieving pain from menstrual cramps. The dosage differed across these studies, but additional research suggests that taking three or four 30 mg capsules of fennel daily in the days leading up to your period can reduce the severity of period pain.