Two new studies debunk the perception that vitamin supplements help ward off prostate and other cancers, the BBC reports. The trials involving 50,000 men provided the most definitive results yet on the effects of vitamins C and E—or, rather lack thereof—on cancer. One study had planned to trace the effects over 7 years but was curtailed because results were so disappointing.
"Supplements don't substitute for a healthy diet, and some studies have shown that they may actually increase the risk of cancer," says one cancer specialist.
(Read more medical study stories.)