Acetaminophen overdose is top cause of liver failure in US
                                
                                
                                    (Newser) -
                                    Acetaminophen overdose is the top cause of liver failure in the US—and concerns about the widespread pain-relief ingredient have been growing. Starting in October, Johnson & Johnson subsidiary McNeil will stick a new warning on the caps of Extra Strength Tylenol, reading: "Contains acetaminophen. Always read the label,...