Castor oil is a yellowish liquid that can be used as a home remedy for constipation because of its laxative property. One study in Nigeria found that oral castor oil helped children with chronic constipation to move their bowels. An upside to castor oil for constipation is that it works quickly.
For that same reason, however, castor oil should be cautiously administered as a constipation remedy. It should not be taken at bedtime, due to its quick effects. Another downside to this constipation remedy is that it tastes bad, so it is recommended that the castor oil be chilled and mixed with a sweetener such as orange juice. Castor oil is generally considered safe, but it can lead to overdose if taken in large amounts.