April 26/San Diego/The Press Association -- Millions of people who take dietary supplements to ward off cancer may be toying with a "two-edged sword" that might do them harm, experts have warned.
A team of U.S. scientists said there was no good evidence that supplement pills and capsules reduced the risk of cancer in healthy individuals, pointing out that antioxidants such as beta carotene, and vitamins C and E might even have biological effects that promote cancer.