Swedish researchers report that antioxidants make cancers worse in mice. It's already known that the antioxidant beta-carotene exacerbates lung cancers in humans. Not exactly what you'd expect given the extravagant — and incessant — claims you hear made about the miraculous effects of antioxidants. In fact, they are either useless or harmful, conclude the editors of the prestigious Annals of Internal Medicine: "Beta-carotene, vitamin E and possibly high doses of vitamin A supplements are harmful." Moreover, "other antioxidants, folic acid and B vitamins, and multivitamin and mineral supplements are ineffective for preventing mortality or morbidity due to major chronic diseases."