Amino Acids - Phenylalanine

Phenylalanine is a ringed amino acid that is readily available in most food sources, particularly meats and milk products, with lower levels found in oats and wheat germ.

It is essential for many bodily functions and is one of the few amino acids that can cross the blood-brain barrier and thus directly affect brain chemistry.

It is the precursor of the amino acid tyrosine, which cannon be reconverted, so phenylalanine is essential in the diet. It has been used for treatment of depression and is a helpful pain reliever.

Aspartame, the new nutrient sweetener, is synthesized from the combination of aspartic acid and phenylalanine.