Marjoram herb is rich in marjoram oil containing many valuable ingredients, tannin compounds, rutin and ascorbic acid. It helps with digestive problems, gastritis and diarrhea. The oil is sometimes used for inhalation in catarrh of the upper respiratory tract. Marjoram herb is used as a spice for hard-to-digest dishes, such as pea soup, legume dishes, and fatty meats.