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. Our proprietary "Star-Rating" system was developed to help you easily understand the amount of scientific support behind each supplement in relation to a specific health condition.
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We hope this provides you with a helpful resource to make informed decisions towards your health and well-being. For a supplement, little scientific support. Tyrosine is an amino acid used by the body to produce certain adrenal stress hormones and chemical messengers in the nervous system neurotransmitters.
Animal research shows that brain levels of these substances decline with stress, and that giving animals tyrosine supplements reverses this decline and improves various tests of performance in stressed animals. In a controlled study, a protein drink containing 10 grams per day of tyrosine was more effective than a carbohydrate drink for improving mental performance scores in a group of cadets taking a stressful six-day combat training course.
A double-blind trial in humans found that one-time administration of mg of tyrosine per 2. Single administrations of tyrosine to mg per 2. The amino acid L-tyrosine can be converted into norepinephrine, a neurotransmitter that affects mood.
Women taking oral contraceptives have lower levels of tyrosine, and some researchers think this might be related to depression caused by birth control pills.
L-tyrosine metabolism may also be abnormal in other depressed people and preliminary research suggests supplementation might help.
Several doctors recommend a week trial of L-tyrosine supplementation for people who are depressed. Published research has used a very high amount— mg per 2. It is not known whether such high amounts are necessary to produce an antidepressant effect. Kenneth Blum and researchers at the University of Texas have examined neurotransmitter deficiencies in alcoholics. Neurotransmitters are the chemicals the body makes to allow nerve cells to pass messages of pain , touch, thought, etc.
Amino acids are the precursors of these neurotransmitters. In double-blind research, a group of alcoholics were treated with 1. This nutritional supplement regimen led to a significant reduction in withdrawal symptoms and decreased stress in alcoholics compared to the effects of placebo. L-tyrosine is the direct precursor to L-dopa. Theoretically, supplementing L-tyrosine could be an alternative to L-dopa therapy; however, L-tyrosine should not be taken with L-dopa as it may interfere with the transport of L-dopa to the brain.
One small preliminary trial demonstrated that some people with Parkinson's disease who supplemented with L-tyrosine 45 mg per pound of body weight for three years had better clinical results and fewer side effects than did patients using L-dopa. New customer? Create your account. Lost password? Recover password.
Remembered your password? Back to login. Already have an account? Login here. Tyrosine is one of 20 standard amino acids, made from the EAA Phenylalanine. It improves alertness, attention, and focus. I like to take 1g upon arising and 1g pre-workout for this reason. BCAA's are large neutral amino acids and when over consumed, can compete with Tyrosine and Tryptophan for "parking spots lending the possibility of depressive symptoms.
Be sure to take all amino if you are going to supplement so as not to throw your "amino pool" out of balance. Too much of a good thing right? Because L-Tyrosine is the precursor of the catecholamines, those who have a challenged COMT gene may want to control exposure and limit to early in the day. L-Tyrosine for Weight Control. Why Use L-Tyrosine. Why Do Dieters Use It? What Do the Advocates Say? There are no studies specifically showing that L-tyrosine helps to promote weight loss.
These are individual opinions and testimonials that may or may not be supported by controlled clinical studies or published scientific articles. Side Effects L-tyrosine has not been reported to cause any serious side effects. Interactions with Medicines As of the last update, we found no reported interactions between this supplement and medicines. It is possible that unknown interactions exist. If you take medication, always discuss the potential risks and benefits of adding a new supplement with your doctor or pharmacist.
More Resources L-Tyrosine. Where to Find It Dairy products, meats, fish, wheat, oats , and most other protein-containing foods contain tyrosine. Resources See a list of books, periodicals, and other resources for this and related topics.
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