Diet Coke is made from water, artificial sweetener (currently Aspartame), caffeine, phosphoric acid, potassium citrate (acid regulator), citric acid, flavorings, and caramel color. Almost all low-calorie or no-calorie sodas have generally the same ingredients except for their flavorings.
*Diet Pepsi uses potassium benzoate as an acid regulator and preservative.
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