Mustard oil had contradictory reputations in different parts of the world over the years. It is a very popular oil in the Indian subcontinent and in Bangladesh. It is used as an edible oil and is considered very healthy, whereas, in the rest of the world, it is often considered toxic, irritable, and not suitable for edible purposes. In some parts of Europe, there is a ban on selling this oil and in some other countries; it is sold as a massage oil reserved for external application only.
Mustard essential oil is totally different from mustard oil, not because it is extracted from anything else, but in terms of the process of extraction, chemical composition, and medicinal properties. Both of these oils are extracted from the seeds of mustard, which bears the scientific nameBrassica Nigra (Black Mustard) or Brassica Hirta (White Mustard).