Diet Coke Plus is a new formulation of Diet Coke fortified with vitamins and minerals. It is sweetened with a blend of aspartame and acesulfame potassium, unlike regular Diet Coke which only contains aspartame. Diet Coke Plus was introduced in April 2007 in select areas for test marketing.
Each 8-ounce serving of Diet Coke Plus provides 15% of the daily value for niacin and vitamins B6 and B12, and 10% for zinc and magnesium. In fact the second main ingredient in diet coke plus is magnesium sulfate.