Alternative Medicine
The following information is specific for alternative and complementary medicine.
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L-tyrosine is a nonessential amino acid (protein building block) that the
body synthesizes from phenylalanine, another amino acid. Tyrosine is important
to the structure of almost all proteins in the body. It is also the precursor of
several neurotransmitters, including L-dopa, dopamine, norepinephrine, and
epinephrine.
Where is it found?
Dairy products, meats, fish, wheat, oats, and most other protein-containing foods contain tyrosine.
L-tyrosine has been used in connection with the following conditions (refer to the individual health concern for complete information):
| Rating | Health Concerns |
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Stress
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Depression
Phenylketonuria (for deficiency) |
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Alcohol withdrawal support
Parkinson's disease
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Reliable and relatively
consistent scientific data showing a substantial health benefit.
Contradictory,
insufficient, or preliminary studies suggesting a health benefit or minimal health
benefit.
An herb is primarily
supported by traditional use, or the herb or supplement has little scientific support and/or
minimal health benefit.
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Who is likely to be deficient?
Some people affected by PKU are deficient in tyrosine. Tyrosine levels are occasionally low in depressed people.1 Any person losing large amounts of protein, such as those with some kidney diseases, may be deficient in several amino acids, including tyrosine.2
How much is usually taken?
Most people should not supplement with L-tyrosine. Some human research with people suffering from a variety of conditions used 100 mg per 2.2 pounds of body weight, equivalent to about 7 grams per day for an average-sized person. The appropriate amount to use in people with PKU is not known, therefore, the monitoring of blood levels by a physician is recommended.
Are there any side effects or interactions?
L-tyrosine has not been reported to cause any serious side effects. However, it is not known whether long-term use of L-tyrosine, particularly in large amounts (such as more than 1,000 mg per day) is safe. For that reason, long-term use of L-tyrosine should be monitored by a doctor.
Vitamin B6, folic acid, and copper are necessary for conversion of L-tyrosine into neurotransmitters.
Are there any drug interactions?
Certain medicines may interact with L-tyrosine. Refer to drug interactions for a list of those medicines.
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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. Neuropsychobiology 1990;23:1-7.
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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.
Last Review: 09-07-2006 
Copyright © 2007 Healthnotes, Inc. All rights reserved.
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The information presented in Healthnotes is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires August 2007.
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