A DECADE AGO, Congress passed a law shielding makers of dietary supplements from regulatory scrutiny. The consequences of the Dietary Supplement Health and Education Act of 1994 were entirely foreseeable: largely uncontrolled sales and marketing of vitamins and herbal remedies without advance approval of their safety and effectiveness. According to a new report by the Institute of Medicine, the foreseeable has come to pass. The report deals broadly with alternative and complementary medicine, which has become a giant industry in America, worth $27 billion a year; visits to alternative-care providers now exceed visits to primary-care doctors. --snip-- An estimated 15...