As with any supplement, the usage and dosage of castor oil depend on the specific product and an individual’s needs, says Schleiger.
When used orally for a laxative effect, Schleiger recommends a dosage of 15 to 60 milliliters of castor oil per day. “Start with the lowest recommended dose and increase gradually, if necessary, to avoid abdominal cramping and other gastrointestinal discomfort,” she adds.
For topical application, Schleiger recommends conducting a patch test first—apply a small amount of oil on a patch of skin and wait for 24 hours to monitor for any allergic reactions. If no reactions occur, proceed to apply the oil directly to the affected area as needed. “Leave it on for a few hours or overnight, then rinse off if desired,” adds Schleiger.
Risks and Side Effects of Castor Oil
While castor oil is generally considered safe for most people when used as directed by a product’s manufacturer or a health care professional, certain individuals, including pregnant women and people with bowel obstruction or appendicitis, should avoid using it.
Potential side effects of using castor oil as a laxative may include abdominal cramping, vomiting, bloating and dizziness.
Castor oil may also interact with certain medications, such as Daybue (trofinetide), a treatment for Rett syndrome, and magnesium citrate, which is used to treat occasional constipation. Anyone considering using castor oil should first consult with a health care provider, especially if they’re using prescription medications, advises Dr. Sears.
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