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Fruits that help our body to produce nitric oxide include oranges, watermelon, mango, and cranberries. Beets, and dark green leafy vegetables like spinach, arugula, and lettuce are a good source of nitrates. The following are vegetables that help increase nitric oxide production: spinach, arugula, kale, and watercress. Other foods and substances that can help us produce nitric oxide are pepper, tofu, and dark chocolate. They all have ingredients present in them that activate our body's nitric oxide production.
Citrulline is found in cucumbers and melons, such as watermelon and cantaloupe; however, research is limited in demonstrating the types of foods containing citrulline that will increase nitric oxide production. Watermelon, including the flesh and rind, is a rich source of citrulline.