Radish greens are often heavily soiled so be sure to rinse them before you use them. But they are a good source of vitamin A, calcium, and iron. They have a slight peppery taste therefore you may want to start with a little bit before you add more.
You can also add it to other recipes. Try this link: http://www.mnn.com/food/recipes/blogs/5-recipes-for-radish-leaves