Kale is in the cabbage family but doesn't form a head like regular cabbage. English curly leaf kale is only one of the many varieties but is the most common sold locally here in Australia. Kale is an excellent source of vitamin K and rich in vitamin A, C, B6, folate and manganese. Kale is a good source of thiamin, riboflavin, vitamin E, iron, calcium, potassium and phosphorus.