Although it is used much in the same way as salad greens, little vegetable with a nutty, peppery flavor is considered a cruciferous vegetable along with many other famous superfoods, including cabbage, broccoli, and cauliflower. Like other cruciferous vegetables, arugula is brimming with health promoting phytochemicals and vitamins and thus makes a great substitute for lettuce. Arugula provides a great source of glucosinolates, natural compounds that turn into isothiocyanates when the plant is chewed. Isothiocyanates are known for their ability to neutralize carcinogenic substances and to inhibit cancer cell proliferation. Arugula also contains vitamin C and beta-carotene (about five times the amount contained in iceberg lettuce) and is extremely low in calories.