Olive oil is rich with multiple vitamins that help lock the keratin in your hair. It is a source of vitamin E and other antioxidants to hydrate and soothe the skin, working to get rid of dry scalp and dandruff. Olive oil is one of the best things you can use in order to reduce dandruff and can add a touch of moisture and weight to your hair, especially when used during dry winter months. Not only does this act as a serum once you’ve shampooed and styled your hair, but it also prevents split ends from occurring.