Many of us have been taking vitamins and supplements for years, sometimes as a result of research we’ve read on the health benefits of various nutrients. How can you tell if what you’re taking is helpful? And can vitamins help to prevent cancer? Diane Brandon is joined this week by Dr. Kedar Prasad, Former Director of the Center for Vitamins and Cancer Research at the University of Colorado School of Medicine and author of Fighting Cancer with Vitamins and Antioxidants. Dr. Prasad has amassed a large body of knowledge about vitamins and supplements based upon his research, and there are some surprising implications for the supplements and specific nutrients that we take.