A new study says men shouldn't look to Vitamins C and E for help preventing heart disease.
It's one of the largest and longest studies of the supplements taken by millions of Americans.
Vitamin E even appeared to raise the risk of bleeding strokes, a danger seen in at least one earlier study. Some research suggests vitamin C may aid cancer, though not fight it.
The results were discussed today at an American Heart Association conference. Results also were published online by the Journal of the American Medical Association.
About 12 percent of Americans take the supplements despite growing evidence that these antioxidants do not prevent heart disease and may even be harmful.
Experts say the results are so clear that they would be unlikely if the study were done in women, minorities, or with different formulations of the vitamins.