If you’ve been trying to grow your hair longer, you may have heard of castor oil. Castor oil is a carrier oil which means that it works amazingly together with other oils such as coconut oil, jojoba oil, olive oil, etc. A carrier oil is an oil that makes another oil work that much harder. Think of how black pepper is used to better absorb vitamins and minerals from foods. Castor oil works the same. But aside from being a carrier oil, castor oil is so much more than that.