Q uestions about the health benefits of vitamin supplements have been percolating in the medical establishment for decades — even as the multivitamin industry has grown to a multi-billion powerhouse in the U.S. This week, the respected journal the Annals of Internal Medicine put its well-heeled foot down. "We believe that the case is closed — supplementing the diet of well-nourished adults with (most) mineral or vitamin supplements has no clear benefit and might even be harmful," the journal said in an editorial. "These vitamins should not be used for chronic disease prevention. Enough is enough." Here's Dr. Edgar Miller...