Most data on the efficacy of tyrosine in the treatment of depression are anecdotal and have not been proved in scientific studies. Tyrosine seems to relieve the physical symptoms of stress if administered before the stressful situation occurs, though studies on humans are limited. Low sex drive. Tyrosine appears to stimulate the libido. Tyrosine is an appetite suppressant and helps reduce body fat.
Tyrosine appears to have a mild stimulatory effect on the central nervous system.
Successful withdrawal from caffeine and nicotine has also been anecdotally reported. Although tyrosine is found in soy products, chicken, fish, almonds, avocados, bananas, dairy products, lima beans, pumpkin seeds, and sesame seeds, it is difficult to get therapeutic amounts of tyrosine from food. It is also produced from phenylalanine in the body. Many tyrosine supplements are available. Tyrosine should not be taken with other amino acids or with proteins such as milk.