L-tyrosine is an amino acid building block for protein, and it is found in such foods as fish, meat, eggs, beans, nuts and dairy, according to WebMD. Tyrosine is also an element that can treat a variety of ailments, including attention deficit disorder, depression and phenylketonuria.
L-tyrosine is one of 22 amino acids that are used by cells to synthesize protein, according to Wikipedia. Mammals get this amino acid from phenylalanine, which is another amino acid that is common in food.
WebMD mentions that tyrosine increases alertness and alleviates sleep-related problems. The amino acid is used to treat chronic fatigue syndrome, Alzheimer's disease and Parkinson's disease as well as serious mental conditions, such as schizophrenia. It addresses a variety of sexual dysfunctions, such as erectile dysfunction and lack of sexual interest, and treats withdrawal symptoms for those who are suffering from cocaine or alcohol addiction.
Tyrosine works as a mood enhancer by boosting neurotransmitters and neurotransmitter plasma, according to Wikipedia. This has more of an effect on people who undergo stressful situations, such as divorce, extreme weather, fatigue or overworking.
The amino acid secures healthy organs and maintains hormonal levels, notes the University of Maryland Medical Center. Tyrosine regulates hormones for the pituitary, thyroid and adrenal glands. It is also an important element in enhancing brain function.