Coca-Cola North America, Atlanta, GA, has launched Diet Coke Plus, a spar­kling, calorie-free beverage with vitamins and minerals. Each eight-ounce serving of Diet Coke Plus provides a good source of niacin (vitamin B3), vitamins B6 and B12, zinc and magnesium (15% Daily Value for niacin, B6 and B12, 10% DV for zinc and magnesium).