The antibacterial and moisturizing properties of Jamaican black castor oil help treat a plethora of hair issues. The rich nutrients in Jamaican black castor oil, some of them being vitamin E and omega-6 and omega-9 fatty acids, help moisturize hair and treat related problems like itchy scalp and dandruff. These ricinoleic acids in Jamaican black castor oil improve blood circulation to the scalp, thereby encouraging hair growth. The oil also nourishes the scalp and strengthens the hair roots, thereby treating thinning hair. It makes your hair thicker, fuller, and shinier.