Frequently Asked Questions What sweetener is in Diet Pepsi? Diet Pepsi contains the artificial sweetener called aspartame. Aspartame is a low-calorie sweetener that is approximately 200 times sweeter than sugar. Find more information here Is aspartame safe for consumption? Yes, aspartame has been extensively studied and approved by regulatory authorities worldwide, including the U.S. Food and Drug Administration (FDA), European Food Safety Authority (EFSA), and numerous other organizations. It is considered safe for consumption when consumed within acceptable daily intake levels. Find more information here Does Diet Pepsi contain any natural sweeteners? No, Diet Pepsi does not contain any natural…