Amni Visnaga, also called Khella essential oil, is steam distilled from the seeds of the khella plant, which grows in Morocco. Amni Visnaga is not purchased for its aroma; when steam-inhaled, it is a powerful antispasmodic and thus is used to treat bronchial asthma and bronchitis. It also is used to control allergic reactions, because it prevents the release of histamines.