Kale is one of the most healthful plant-based foods you can eat. In addition to being a good source of dietary fiber and high amounts of vitamins A, B6, C and K, kale contains more than 45 antioxidants, including beta-carotene, quercetin and kaempferol. Kale powder is an easy way to enjoy this nutrient powerhouse in concentrated form, no refrigeration or cooking skills required.