Ingredient · E951

Aspartame Caffeine

Source
Not animal-derived
Allergen
No
Role in food
This combination is frequently used in low-calorie or sugar-free beverages, such as diet sodas, …

What is Aspartame Caffeine?

Aspartame is an artificial sweetener made from two amino acids, aspartic acid and phenylalanine. Caffeine is a stimulant found naturally in plants like coffee and tea, but it can also be produced synthetically. When listed together, they indicate a product contains both an artificial sweetener and a stimulant.

Is Aspartame Caffeine vegan?

Aspartame Caffeine is not animal-derived. Products that contain it can still include other animal-derived ingredients, so check the full ingredient list.

Is Aspartame Caffeine a major allergen?

Aspartame contains phenylalanine, which requires a warning for individuals with phenylketonuria (PKU).

What is Aspartame Caffeine used for?

This combination is frequently used in low-calorie or sugar-free beverages, such as diet sodas, energy drinks, and powdered drink mixes.

Is Aspartame Caffeine safe?

The FDA has approved aspartame as a food additive, and JECFA has evaluated it and set an acceptable daily intake.

Why it's used

This combination is frequently used in low-calorie or sugar-free beverages, such as diet sodas, energy drinks, and powdered drink mixes. Aspartame provides sweetness without sugar, while caffeine adds a stimulating effect.

Health notes

The FDA has approved aspartame as a food additive, and JECFA has evaluated it and set an acceptable daily intake. In 2023, the International Agency for Research on Cancer (IARC) classified aspartame as possibly carcinogenic to humans (Group 2B), while JECFA maintained its existing acceptable daily intake. Caffeine is generally recognized as safe (GRAS) by the FDA for certain uses. High amounts of caffeine can cause side effects like nervousness, anxiety, and difficulty sleeping.

Allergen info

Aspartame contains phenylalanine, which requires a warning for individuals with phenylketonuria (PKU). Neither aspartame nor caffeine is derived from any of the nine major food allergens.

Foods that contain Aspartame Caffeine

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Last updated: October 6, 2026

Note: This site presents label data from USDA FoodData Central for general information. It is not medical advice. Check the package label; formulations change.