Castor oil is a multi-purpose vegetable oil that people have used for thousands of years. It’s made by extracting oil from the seeds of the Ricinus communis plant. These seeds, which are known as castor beans, contain a toxic enzyme called ricin. However, the heating process that castor oil undergoes deactivates it, allowing the oil to be used safely. Castor oil has a number of medicinal, industrial and pharmaceutical uses.
A Natural Moisturizer
Castor oil is rich in ricinoleic acid, a monounsaturated fatty acid. 
These types of fats act as humectants and can be used to moisturize the skin. Humectants retain moisture by preventing water loss through the outer layer of the skin.
Promotes Wound Healing
Applying castor oil to wounds creates a moist environment that promotes healing and prevents sores from drying out. Venelex, a popular ointment used in clinical settings to treat wounds, contains a mixture of castor oil and Peru balsam, a balm derived from the Myroxylon tree. Castor oil stimulates tissue growth so that a barrier can be formed between the wound and the environment, decreasing the risk of infection. It also reduces dryness and cornification, the buildup of dead skin cells that can delay wound healing
Reduces Acne
Acne is a skin condition that can cause blackheads, pus-filled pimples and large, painful bumps on the face and body. It’s most common in teens and young adults and can negatively impact self-esteem. Castor oil has several qualities that may help reduce acne symptoms. Inflammation is thought to be a factor in the development and severity of acne, so applying castor oil to the skin may help reduce inflammation-related symptoms.
Keeps Your Hair and Scalp Healthy
Many people use castor oil as a natural hair conditioner. Dry or damaged hair can especially benefit from an intense moisturizer like castor oil. Applying fats like castor oil to the hair on a regular basis helps lubricate the hair shaft, increasing flexibility and decreasing the chance of breakage. Castor oil may benefit those who experience dandruff, a common scalp condition characterized by dry, flaky skin on the head.