Diet Coke Plus, also marketed as Coca-Cola Light Plus, was a formulation of Diet Coke fortified with vitamins and minerals. It was sweetened with a blend of aspartame and acesulfame potassium.

Aspartame is an artificial, non-saccharide sweetener commonly used as a sugar substitute in foods and beverages. It is 200 times sweeter than sucrose, and is a methyl ester of the aspartic acid/phenyl