Mustard oil seeds are the seeds of the mustard plant, which is a member of the Brassicaceae family. They are small, round seeds that are typically yellow, brown, or black in color. Mustard oil seeds have a strong, pungent flavor that is due to the presence of mustard oil.

Mustard oil seeds are a good source of protein, fiber, and vitamins and minerals, including vitamin C, vitamin K, and magnesium. They also contain antioxidants, which can help protect the body from damage caused by free radicals.