Sourced from the castor bean (Ricinus communis), castor oil is rich in ricinoleic acid—a type of fatty acid found to fight inflammation. When applied to the scalp, it’s purported to enhance the health of the hair follicles and, in turn, promote hair growth (as well as protect against hair loss).
Many people use castor oil as a natural hair conditioner. Dry or damaged hair can especially benefit from an intense moisturizer like castor oil. Castor oil may benefit those who experience dandruff, a common scalp condition characterized by dry, flaky skin on the head.
As castor oil gains popularity in the natural beauty world, proponents suggest that the use of oil can dramatically increase the rate of hair growth. Some even claim that monthly application of the oil can boost hair growth by up to five times the usual rate.
Ref. Very Well Health/Healthline