Evening primrose oil
Taken orally or massaged on the cervix, there are NO benefits to using evening primrose oil to induce labor, Collins said.
In fact, women who use the oil are at increased risk for prolonged rupture of membranes, arrest of descent—or the baby not coming down the birth canal despite having contractions—and higher rates of vacuum assisted births, according to a report in the journal BJOG: An International Journal of Obstetrics & Gynaecology.