Watercress is an excellent natural food. It contains more Vitamin C than fresh oranges and more calcium that cow's milk. It also contains iron and beta carotene, which the body converts to Vitamin A, as well as being a good source of Vitamin E. In fact, it's one of the best 'ACE' foods available: Vitamins A, C and E are antioxidants which help to neutralise the harmful effects of 'free radicals' - chemicals produced by modern living that are all around us, which can damage our tissues without us knowing anything about it.