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"Amino Acids"

By Paige Waehner, About.com

Updated: May 27, 2005

About.com Health's Disease and Condition content is reviewed by our Medical Review Board

Definition: Amino acids are known as the building blocks of protein. They perform many important functions such as: building cells, protecting the body from viruses or bacteria, repairing damaged tissue and carrying oxygen throughout the body.

There are two kinds of amino acids: essential and non-essential. Essential amino acids are those that can't be produced in the body, so you get these from foods or supplements. The eight essential amino acids include:

Isoleucine
Leucine
Lysine
Methionine
Phenylalanine
Threonine
Tryptophan
Valine
Serine

Some of these essential amino acids can be found in wheat, corn, beans, rice, beef and whey.

Non-essential amino acids are those that are produced within the human body. These include: Alanine
Asparagine
Aspartic Acid
Cysteine
Glutamic Acid
Glutamine
Glycine
Proline
Tyrosine
Arginine
Histidine

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