Nutrient Database

L-Phenylalanine

amino acid

Approved

General information about nutrients. No diagnosis, no medical advice. If you take medication, are pregnant or have a medical condition, talk to your doctor before taking supplements.

Empty stomachNot before sleep

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Overview

Essential amino acid and precursor to tyrosine, dopamine, and norepinephrine.

Top 5 food sources

Soybeanscheesebeefchickenpumpkin seeds
Expert consensus: Moderate

Contraindicated in phenylketonuria (PKU). Otherwise safe through diet.