Red Oil for Hair Growth What is red oil and where does it come from? Red oil is a hair oil that helps to nurish your hair, moisturise your scalp, lengthen and strengthen your hair, it also helps promote new hair growth. How often should I use red oil? 2 or 3 times a week, and learn to use it on schedule. Use it at the same time every day you use it and wash it out properly. It can take up to 3 washes with hot water and shampoo to get it completely out of your hair.