Top Definition
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

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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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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt