Ingredient

Phenyletonurics: Contains Phenylalanine

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Source
Unknown
Not yet classified by editors
Allergen
No
Role in food
Phenylalanine is not typically added as an ingredient for its functional properties. However, it …

What it is

Phenylalanine is an essential amino acid, meaning the body cannot make it and it must be obtained from food. It is one of the 20 amino acids that make up proteins. Phenylalanine is found naturally in many protein-rich foods like meat, fish, eggs, and dairy.

Why it's used

Phenylalanine is not typically added as an ingredient for its functional properties. However, it is a component of the artificial sweetener aspartame. Foods containing aspartame, such as diet sodas and sugar-free products, will list phenylalanine as an ingredient.

Health notes

Phenylalanine is a naturally occurring amino acid. For individuals with the rare genetic disorder phenylketonuria (PKU), phenylalanine cannot be properly metabolized, leading to harmful buildup. Products containing aspartame are required to carry a warning label for individuals with PKU. The FDA has evaluated aspartame and its components, including phenylalanine, for safety. International bodies like JECFA have also assessed aspartame.

Allergen info

Phenylalanine is not a major allergen. It is not derived from milk, egg, fish, shellfish, tree nuts, peanuts, wheat, soy, or sesame. It does not contain gluten.

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Last updated: September 28, 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.