Evening primrose oil comes from seeds of a wildflower that grows in the United States.  It is usually found in capsules or as an oil.  Some pregnant moms use evening primrose oil to help with cervical ripening, to attempt to induce labor. The research available on evening primrose oil sheds some light on whether this is a good method to induce labor naturally and what some of the side effects are.  This episode answers a question about what evening primrose oil does and whether you should take it.