Oncologists say antioxidant supplements may reduce the effectiveness of chemotherapy and radiation therapy. But despite this link, a new study has found that 61 percent of breast cancer patients receiving chemo, radiation, or anti-estrogen drug therapy were taking supplements of antioxidants like vitamins C and E, beta carotene, or selenium. The evidence about antioxidants is by no means conclusive, experts say, and there is even some research that shows the supplements may protect healthy...