Aspartame is one of the most widely used artificial sweeteners in the world, and it shows up in a long list of beverages, from diet sodas to powdered drink mixes to sugar-free teas. A 12-ounce can of diet soda contains roughly 200 milligrams of aspartame, though the exact amount varies by brand and flavor.
Diet Sodas
Diet sodas are the single biggest source of aspartame in most people’s diets. Diet Coke, Diet Pepsi, Coca-Cola Zero Sugar, Diet Dr Pepper, Diet Mountain Dew, Sprite Zero, Fanta Zero, and Diet 7UP all contain aspartame, either as the sole sweetener or blended with other zero-calorie sweeteners like acesulfame potassium. Some brands pair aspartame with sucralose to balance the flavor profile.
Not every “zero sugar” soda uses aspartame. Pepsi Zero Sugar, for example, has moved to sucralose in some markets, and newer lines from smaller brands often use stevia or monk fruit instead. The only reliable way to check is the ingredient label.
Powdered Drink Mixes and Water Enhancers
Crystal Light is one of the best-known powdered drink mixes that contains aspartame. Many of its flavors use a combination of aspartame and sucralose. If you want to avoid it, Crystal Light Pure swaps artificial sweeteners for sugar, dried corn syrup, and stevia leaf extract.
Other powdered mixes that commonly list aspartame include Wyler’s Light, Great Value (Walmart’s store brand) drink mixes, and sugar-free versions of Kool-Aid. Liquid water enhancers like certain MiO varieties may also contain aspartame, though many have shifted to sucralose or stevia.
Teas, Juices, and Sports Drinks
Sugar-free or “light” iced teas frequently contain aspartame. Diet Snapple, Brisk Diet Iced Tea, and store-brand diet teas are common examples. Some reduced-calorie juice drinks and lemonades use aspartame alongside small amounts of real sugar to cut total calories while keeping a familiar sweetness.
In the sports drink category, Gatorade Zero and Powerade Zero have generally used sucralose rather than aspartame, but sugar-free energy drinks are more of a mixed bag. Certain flavors of Diet Red Bull and sugar-free energy drinks from smaller brands do include aspartame. Again, the label is the definitive check.
How to Spot Aspartame on a Label
In the United States, aspartame is listed by name in the ingredient panel. In Europe and other regions that use the E-number system, look for E951 or INS-951 on the label. You may also see a warning statement that reads “Phenylketonurics: Contains Phenylalanine,” which is required on any product with aspartame because people with the genetic condition phenylketonuria (PKU) cannot safely metabolize one of aspartame’s breakdown products.
If a product carries that phenylalanine warning, it contains aspartame, even if you missed it scanning the ingredient list.
How Much Is in a Typical Drink
A standard 12-ounce can of diet soda has about 200 milligrams of aspartame. A single-serve packet of a powdered drink mix typically contains less, roughly 50 to 100 milligrams depending on the brand and flavor. The FDA has set the acceptable daily intake (ADI) at 50 milligrams per kilogram of body weight. For a 150-pound (68 kg) adult, that works out to about 3,400 milligrams per day, or roughly 17 cans of diet soda. The international guideline set by the Joint FAO/WHO Expert Committee is slightly lower at 40 mg/kg body weight.
Most people who drink one or two diet sodas a day are consuming well under 10 percent of the ADI.
The Safety Picture
In July 2023, the International Agency for Research on Cancer (IARC) classified aspartame as “possibly carcinogenic to humans” (Group 2B), based on limited evidence linking it to liver cancer in some studies. That classification reflects the strength of available evidence, not the actual level of risk at normal consumption. Group 2B is the third highest of four tiers and is the same category that includes things like aloe vera extract and pickled vegetables.
At the same time, the WHO’s food safety committee reaffirmed the existing acceptable daily intake, concluding that aspartame at typical consumption levels does not pose a clear health risk. The FDA has maintained its approval since 1981 and has not changed its position. People with PKU remain the one group that genuinely needs to avoid aspartame entirely.