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There is no government or official recommendation for the proper dose of castor oil. According to the Natural Medicines Database, different amounts have been used in scientific studies.
For example, in studies investigating constipation, a dose of 15 milliliters (mL) has been used. For cleaning the bowel prior to surgery, a dose of 15–60 mL has been studied in adults.
For inducing labor different amounts have been used with single doses vary from 5-120 milliliters of castor oil. *
