New research has examined that excessive use of vitamins and dietary supplements can increase the risk of cancer. The study by the University of Colorado Denver suggested that over-the-counter supplements may actually increase the risk of cancer if taken in excess of the recommended daily amount. Tim Byers, associate director for cancer prevention and control CU Cancer Center said they were not sure why this was happening at the molecular level but evidence showed that people who take more than the necessary dietary supplements tend to have higher risk of developing cancer. An essay explores the effects of the supplements beta-keratin showed that taking more than the recommended dose increases the risk of developing both lung cancer and heart disease by 20 percent. Folic acid, which is believed to help reduce the number of colon polyps, actually increased the number in another trial.