Kale powder is made from fresh kale leaves (Brassica oleracea acephala). The leaves are washed, steamed, trimmed, diced, dried, and ground into a fine powder.
Kale is a good source of vitamin K and other micronutrients such as Vitamin A and lutein.1 Kale belongs to cruciferous vegetable, which are unique in that they are rich sources of sulfur-containing compounds known as glucosinolates.2 High intakes of cruciferous vegetables have been associated with lower risk of certain cancers.3,4
National Nutrient Database for Standard Reference. Spinach, Raw. United States Department of Agriculture (USDA). https://ndb.nal.usda.gov/ndb/foods/show/301876
Oregon State University, Linus Pauling Institute, Micronutrient Center. http://lpi.oregonstate.edu/mic/food-beverages/cruciferous-vegetables
van Poppel G1, Verhoeven DT, Verhagen H, Goldbohm RA. Brassica vegetables and cancer prevention. Epidemiology and mechanisms. Adv Exp Med Biol. 1999;472:159-68. PMID:10736624
Cruciferous Vegetables and Cancer Preventiom. National Cancer Institute. NIH. https://www.cancer.gov/about-cancer/causes-prevention/risk/diet/cruciferous-vegetables-fact-sheet