Helps Elevate Mood & Reduce Stress*

L-tyrosine may help athletes avoid overtraining, due to its ability to offset fatigue.1 Because L-tyrosine is a precursor of Dopamine, supplementing with L-tyrosine may heighten mental alertness, increase feelings of well being, and offset physical and mental fatigue.2,3

1. Romanowski, W, and Grabiec S. The role of serotonin in the mechanism of central fatigue. Acta Physiol Pol 25: 127-134, 1974.
2. Lieberman, HR, Corkin S, Spring BJ, Wurtman RJ, and Growden JH. The effects of dietary neurotransmitter precursors on human behavior. Am J Clin Nutr 42: 366-370, 1985.
3. Banderet, LE, and Lieberman HR. Treatment with tyrosine, a neurotransmitter precursor, reduces environmental stress in humans. Brain Res Bull 22: 759-762, 1989.


L-Tyrosine is a non-essential amino acid and a precursor to adrenaline, dopamine, and norepinepherine and L-dopa. These neurotransmitters are involved with mental function, mood, satiety and response to stress.* L-tyrosine is also involved in the production of thyroid hormone and the skin pigment melanin.* High purity, well tolerated, hypoallergenic*

Tyrosine is not an essential amino acid, as it is sythesised in the body, from phenylalanine. Like phenylaalanine, tyrosine is intimately involved with the important brain neurotransmitters epinephine, norepinephrine, and dopamine.

Animals subjected to stress in the laboratory have been found to have reduced levels of norepinephrine. Treating with tyrosine prior to stressing the animals prevents reduction of this neurotransmitter. Findings such as these led to human tyrosine experiments in which soldiers undergoing various forms of stress were given tyrosine to see what effect it might have on their performance. In one of these experiments, conditions were created that simulated a rapid ascent to 15,500 feet. This dramatically stresses the mind and body and significantly diminishes the oxygen supply to the brain.

Some of those soldiers were given tyrosine supplements prior to this challenge and some were not. Those who got the tyrosine performed much better on a variety of tests than those who did not get the supplements. The tyrosine-dosed were more alert, efficient, less anxious and had fewer complaints about the physical discomforts during the trial.

There is also growing clinical evidence that suggest tyrosine may be an effective anti-depressant and even useful in some major forms of depression.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease

- Q & A -


Where is it found?

Dairy products, meats, fish, wheat, oats, and many other foods contain tyrosine.

Who is likely to be deficient? 

Some people affected by PKU are deficient in tyrosine. Tyrosine levels are sometimes low in depressed people.5 Any person losing large amounts of protein, such as those with some kidney diseases, may be deficient in several amino acids, including tyrosine.6

How much is usually taken? 

Most people should not supplement tyrosine. Some human research with people suffering from a variety of conditions use the equivalent of 7 grams per day. A useful amount in people with PKU remains uncertain. In that case, monitoring of blood levels by a nutritionally oriented physician is recommended.

Are there any side effects or interactions? 

Tyrosine is not generally associated with side effects.

Vitamin B6, folic acid, and copper are necessary for conversion of tyrosine into neurotransmitters.

At the time of writing, there were no well-known drug interactions with tyrosine.


1. Gelenberg AJ, Gibson CJ, Wojcik JD. Neurotransmitter precursors for the treatment of depression. Psychopharmacol Bull 1982;18:7–18.
2. Meyer JS, Welch KMA, Deshmuckh VD, et al. Neurotransmitter precursor amino acids in the treatment of multi-infarct dementia and Alzheimer’s disease. J Am Ger Soc 1977;7:289–98.
3. Banderet LE, Lieberman HR. Treatment with tyrosine, a neurotransmitter precursor, reduces environmental stress in humans. Brain Res Bull 1989;22:759–62.
4. Koch R. Tyrosine supplementation for phenylketonuria treatment. Am J Clin Nutr 1996;64:974–75.
5. Chiaroni P, Azorin JM, Bovier P, et al. A multivariate analysis of red blood cell membrane transports and plasma levels of L-tyrosine and L-tryptophan in depressed patients before treatment and after clinical improvement. Neuropsychobiol 1990;23:1–7.
6. Alvestrand A, Ahlberg M, Forst P, Bergstrom J. Clinical results of long-term treatment with a low protein diet and a new amino acid preparation in patients with chronic uremia. Clin Nephrol 1983;19:67–73.




120 Capsules - 500 mg



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