You heard correctly. Green leafy vegetables, including arugula, are rich sources of nitrates that convert to nitric oxide (NO) when consumed. NO is a potent vasodilator that may lower blood pressure, promote eye health, and enhance sport performance.
For more information about dietary nitrates and nitrites, check out this article.
The primary source of dietary nitrates comes from the naturally occurring sources in fruits, vegetables, and water. So to reap the health benefits of nitric oxide, eat your green, leafy vegetables! Fill half your plate with fruits and vegetables at each meal or eating occasion to meet your daily recommendation of fruits and vegetables. Keep in mind all forms matter, fresh, frozen, canned, dried, and 100% juice.