Broccoli is high in Vitamin C and dietary fiber. It also contains multiple nutrients with potent anti-cancer properties, such as diindolylmethane and small amounts of selenium. Broccoli also contains the compound glucoraphanin, which can be processed into an anti-cancer compound sulforaphane. It is also an excellent source of indole-3-carbinol, a chemical which boosts DNA repair in cells and appears to block the growth of cancer cells. To draw a conclusion, broccoli is a very useful vegetable.