More than half the Canadian population regularly uses vitamins and minerals in order to stay healthy, according to Health Canada. Yet most are likely not aware that high doses of many common vitamins can increase the risk of cancer or death. “Vitamins have become synonymous with health, but there’s this false idea that, if a little bit is good, a lot has to be better,” says Dr. Tim Byers, associate dean at the Colorado School of Public Health. Byers challenged this idea recently at the American Association for Cancer Research’s annual meeting. “We now have direct evidence that a lot...