Mustard oil, which is produced from the seeds of the mustard plant, is a common ingredient in Indian cuisine.
Known for its strong flavor, pungent aroma, and high smoke point, it’s often used for sautéing and stir-frying vegetables in many parts of the world, including India, Bangladesh, and Pakistan.
Although pure mustard oil is banned for use as a vegetable oil in the United States, Canada, and Europe, it’s often applied topically and used as a massage oil, skin serum, and hair treatment (1).
Mustard essential oil, a type of essential oil produced from mustard seeds using a steam distillation process, is also available and approved for use as a flavoring agent (1).
Source – https://www.healthline.com/nutrition/mustard-oil-benefits