Nigella sativa (black caraway, also known as black cumin, nigella or kalonji) is an annual-flowering plant in the family Ranunculaceae, native to eastern Europe (Bulgaria, Cyprus and Romania) and western Asia (Turkey, Iran and Iraq), but naturalized over a much wider area, including parts of Europe, northern Africa and east to Myanmar
The seed oil supports the body’s natural defenses by encouraging optimal function of a healthy, aging immune system. It does this by supporting the vital defensive activities of immune cells that work together to bolster your immune system.
According to this page on the U.S. government HIH website, “Due to its miraculous power of healing, N. sativa has got the place among the top ranked evidence based herbal medicines. This is also revealed that most of the therapeutic properties of this plant are due to the presence of thymoquinone which is major bioactive component of the essential oil.”
As a food supplement it should be readily available at health food stores.