Castor oil is often thought to jump-start labor, especially for women who cannot wait to deliver their babies, or for overdue pregnancy cases. Yet, this has not been scientifically proven, since the exiguous amount of studies conducted on this subject revealed that castor oil can start labor, but does not induce labor.
Dr. Yamaguchi, obstetrician, asserts that castor oil causes irregular and painful spasms, which affect the mother and baby alike. Not to mention its awful taste. Besides, it can cause fatigue or meconium prior to delivery. Using prune or prune juice is a good option to induce labor naturally.