Arugula is another plant of the Brassica family (Brassica eruca) also known as cruciferous vegetables. Cruciferous vegetables are naturally high in antioxidants and fiber. Native to the Mediterranean region, arugula is a natural source of vitamins A & K, Potassium and Calcium. Arugula is also high in nitrates, containing 18% more nitrates than kale. Nitrates are a natural means to combat hypertension and protect individuals at risk of heart attack. So, pretty important stuff!