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Amino acid

L-Phenylalanine

Phenylalanine is an essential amino acid that comes from food and is the starting material for tyrosine.

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Where is it found?

Meat, eggs, milk and nuts contain phenylalanine. Aspartame also supplies it, which matters for people with phenylketonuria. 1

Sources

  1. Phenylketonuria MedlinePlus Genetics