Steam-distilled from the seeds of the Brassica nigra plant, Mustard Oil Natural is sometimes referred to as “Black Mustard Seed” and is a native product of the Mediterranean. The oil’s primary constituent is a spicy component known as allyl isothiocyanate, which provides an extremely sharp and pungent aroma. This odorous quality makes mustard oil natural a common addition to natural seasoning blends, seafood flavorings, and certain table mustard sauces. While the oil is not commonly used for perfumery, black mustard has been known to have interesting effects when used within fragrance blends that include geranium, violet, and other floral components.