The most famous associations for castor oil come from its benefits as a natural laxative. Known for providing relief from constipation as well as discomfort during cramping, castor oil can be used frequently by sufferers to help maintain sound bowel movements and support a healthy digestive system. The ricinoleic acid found in castor is said to stimulate nutrient absorption in the bowels, which in turn cleanses the system and allows for easier digestion. It can also increase muscle movement of the intestinal muscles to help pass bowel movements more efficiently. A 2010 study conducted in Turkey measured the effects of castor oil on a series of elderly people who had spent at least ten years dealing with constipation issues. An astounding 80 percent of participants reported improvements in their symptoms after taking castor oil for three days. While using castor oil in this way is best targeted in capsule form, topical application can also provide some relief from some symptoms.