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Kale, like other leafy greens, is very high in antioxidants. This includes the flavonoids quercetin and kaempferol, which are found in relatively large amounts in kale. Antioxidants are substances that help fight free radicals in the body. Kale is one of the world's best sources of vitamin K, with a single raw cup containing almost 7 times the recommended daily amount. The form of vitamin K in kale is K1, which is different than vitamin K2. K2 is found in fermented soy foods and certain animal products. Kale Is high in Lutein and Zeaxanthin, which supports eye health.