This product is likely High Fructose Corn Syrup Free.
Carbonated water, caramel color, phosphoric acid, aspartame, potassium benzoate (to protect taste), natural flavors, potassium citrate, acesulfame potassium, caffeine, stevia extract.
Phenylketonurics: contains phenylalanine caffeine content: 57 mg/20 fl oz