Tyrosine is thought to lift one's spirits. It may aid in the treatment of depression, anxiety, narcolepsy, and insomnia. It may aid in the suppression of hunger and the reduction of body fat. It might cause the secretion of human growth hormone (HGH). The use of tyrosine as a dietary supplement or as part of any other program is not recommended. High doses of tyrosine can be toxic to the brain. L-tyrosine is an amino acid that occurs naturally in food proteins such as meat, milk products, and whole grains. It may help improve mental focus and concentration, relieve stress, and promote mood stability. Some studies suggest that it may also play a role in cognitive development for children at risk for learning problems due to low IQ scores or developmental delays. There is some evidence that taking L-tyrosine can help people who suffer from anxiety or depression. However, more research is needed on this topic before a clear conclusion can be reached. People who take L-tyrosine as a supplement should not eat foods containing tyramine (found in common foods like bread, beer, and wine) for at least 24 hours prior to beginning supplementation. This is because eating these foods will cause your body to produce more dopamine - which is why many experts recommend avoiding foods high in tyramine during attempts to treat depression with L-tyrosine.