Antioxidant capacity: 2.8 mmol/3.5 oz
Cruciferous veggies, including kale, are known to be antioxidant-rich. Kale provides vitamin C, carotenoids, folate, calcium, potassium, and fiber, making it a nutrient-rich choice. One study reported that kale is also rich in polyphenolic compounds that increase its antioxidant capacity. You may want to opt for using raw kale in salads to reap the most benefits, as the research noted that cooking kale reduced the antioxidant content of this popular Brassica veggie.