Castor oil can be used on the scalp to help prevent and remedy hair loss and it is effective at this for several reasons. It’s antibacterial and anti-fungal properties make it beneficial against follliculitus, dandruff, and scalp infections and its ricinoleic acid content helps increase circulation to the scalp and improve hair growth. Ricinoleic acid is also said to help balance scalp pH which can also help replenish the scalp’s natural oils and undo some of the damage from harsh chemical hair products and even damage due to over alkalinity. The antioxidants in castor oil also support the keratin in hair and help make hair stronger, smoother, and less frizzy.