1 of 3 chemicals found in Aspartame, the other 2 being aspartic acid and methanol. High levels of phenylalanine in the blood can cause reduction to serotonin levels in the brain, which can cause a person to be short-tempered, bipolar, and even depressed and suicidal.
You don’t need PKU for Phenylalanine to give you brain damage.
by Riccc James February 03, 2007
n. one of two amino acids found in the artificial sweetener aspartame. look on the back of any diet soda bottle.
Hubby: phenylalanine is such a savage word, bro.

Pepe: yeah, its vicious.

by CPepe December 19, 2005

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