Nourishes your hair and restores strength and shine to dry, fluffy hair. Essential fatty acids nourish your hair from the roots. If your hair tends to fall out due to shedding or straightening, or if you find yourself in a period of straightening, use castor oil. Castor oil contains fatty acids that moisturize your hair and prevent it from drying out. How to use Astor oil? 1. Apply castor oil to your scalp and lips before bed. 2. Wrap your hair in plastic and then in a towel. 3. Sleep with oil in your hair. 4. Wash your hair the next morning. For best results, use the oil 6 to 8 weeks straight.