Mustard oil is a fatty vegetable oil produced from mustard seeds using a steam distillation process. The benefits of mustard oil are many. It is known to promote skin and hair health and can be used to alleviate pain. It also possesses powerful antimicrobial properties and may help block the growth of certain types of harmful bacteria. Often it is applied topically to help optimize hair and skin health as it reduces fine lines and wrinkles, and increases hair growth.