Phenylalanine (Phe) is an essential amino acid that supports brain function and mood. It is necessary for the production of proteins and neurotransmitters, including dopamine, which influences mental well-being. Phenylalanine can be obtained from foods such as meat, fish, dairy, and soy products.
Testing for phenylalanine levels can be particularly important for individuals with metabolic disorders like phenylketonuria (PKU), where phenylalanine processing is impaired. It’s also beneficial for people experiencing symptoms like fatigue, depression, or skin disorders, as phenylalanine is crucial for neurotransmitter production and skin health.
Phenylalanine is found in high-protein foods like beef, poultry, pork, and fish. Dairy products, eggs, and soy products also contain significant amounts. For plant-based diets, nuts, seeds, and legumes are good sources, though the concentration is typically lower than in animal proteins.