Description
Evening primrose oil (EPO) is made from the seeds of evening primrose flowers, native to North America. People traditionally used it to treat conditions including bruises, hemorrhoids, and sore throats.
SIDE EFFECTS
Evening primrose oil is likely safe for most people when taken in doses up to 6 grams daily for up to 1 year. It might cause mild side effects including upset stomach, nausea, diarrhea, and headache in some people.