Researchers say this is the first long-term, large-scale, randomized trial of multivitamins to show a benefit.
The study included nearly 15,000 men over age 50. They were followed for a decade.
Researchers found a daily dose of Centrum Silver translated into an 8% reduced risk for cancer overall for the men.
An estimated one-third of Americans take multivitamins. No dangerous side effects were found. The multivitamins appeared to have no impact on the risk for prostate cancer.