Cabbage also contains small amounts of other micronutrients, including vitamin A, iron and riboflavin. As you can see in the list above, it is rich in vitamin B6 and folate, both of which are essential for many important processes in the body, including energy metabolism and the normal functioning of the nervous system. In addition, cabbage is high in fiber and contains powerful antioxidants, including polyphenols and sulfur compounds. Antioxidants protect the body from damage caused by free radicals. Free radicals are molecules that have an odd number of electrons, making them unstable. When their levels become too high, they can damage your cells. Cabbage is especially high in vitamin C, a potent antioxidant that may protect against heart disease, certain cancers and vision loss.