Castor oil is a thick, odorless, yellowish vegetable oil that comes from the seeds of the castor plant, Ricinus communis. It's extracted by cold-pressing the seeds and then applying heat. Castor oil is not considered edible and makes up a small portion of the world's vegetable oil production.

Castor oil has been used for centuries for a variety of purposes, including: 

Skin care

Castor oil is rich in fatty acids and can be used as a moisturizer. It may also have anti-inflammatory effects and help with wound healing. 

Hair growth

Castor oil may help with hair growth. 

Laxative

Castor oil contains ricinoleic acid, which can cause muscle contractions in the intestines to help with bowel movements. However, castor oil is a powerful laxative and can cause gastrointestinal discomfort or dehydration if taken with other laxatives or medications. 

Denture care

Castor oil has antibacterial and antifungal properties that may help keep dentures clean. One study found that soaking dentures in a 10% castor oil solution for 20 minutes can kill oral bacteria and fungi. 

Castor oil is also used in many products, including: Motor fuel, High-gloss paint, Body soap, Cosmetics, and Deodorants.