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GNC L-Tyrosine 1000

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60 Tablets

Item #128212 See Product Details

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Description
  • Tyrosine is a non-essential amino acid that can be synthesized by the body.
  • L-Tyrosine provides dietary support for normal, healthy nervous system activity.*
  • Amino acids are the building blocks of protein and help fuel skeletal muscles.*
  • Each tablet contains 1000 mg of free-form Tyrosine.
  • Kosher and Vegetarian

* 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.

Supplement Facts

As a dietary supplement, take one to four tablets daily on an empty stomach.

Serving Size 1 Tablets
Servings Per Container 60
Amount Per Serving % DV
L-Tyrosine 1000.00 mg **
** Daily Value (DV) not established

Other Ingredients: Cellulose, Food Glaze

No Sugar, No Starch, No Artificial Color, No Artificial Flavors, No Preservatives, Sodium Free, No Wheat, No Gluten, No Corn, No Soy, No Dairy, Yeast Free

Storage Instructions: Store in a cool dry place.

Warning: Keep out of reach of children

General Nutrition CorporationPittsburgh, PA 15222

Health Notes

L-Tyrosine

L-Tyrosine
This nutrient has been used in connection with the following health goals
  • Reliable and relatively consistent scientific data showing a substantial health benefit.
  • Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
  • For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support.

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. While there is no way to predict whether a vitamin, mineral, or herb will successfully treat or prevent associated health conditions, our unique ratings tell you how well these supplements are understood by the medical community, and whether studies have found them to be effective for other people.

For over a decade, our team has combed through thousands of research articles published in reputable journals. To help you make educated decisions, and to better understand controversial or confusing supplements, our medical experts have digested the science into these three easy-to-follow ratings. We hope this provides you with a helpful resource to make informed decisions towards your health and well-being.

This supplement has been used in connection with the following health conditions:

Stress
Dose: 150 mg for every 2.2 lbs (1 kg) of body weight, split into two doses taken before stressful activitiy (take the second dose 40 to 90 minutes after the first)
Occasionally taking this amino acid before a stressful activity may help maintain your mental capacity.(more)
Depression
Dose:

Consult your doctor

Some people with depression have been found to improve with tyrosine. (more)
Stress
Dose: 150 mg for every 2.2 lbs (1 kg) of body weight, split into two doses taken before stressful activitiy (take the second dose 40 to 90 minutes after the first)

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.1 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.2 A double-blind trial in humans found that one-time administration of 150 mg of tyrosine per 2.2 pounds of body weight helped prevent a decline in mental performance for about three hours during a night of sleep deprivation.3 Single administrations of tyrosine (100 to 150 mg per 2.2 pounds of body weight) have also helped preserve mental performance during physically stressful conditions such as noise or extreme cold in several controlled studies.4, 5, 6, 7

References

1. Owasoyo JO, Neri DF, Lamberth JG. Tyrosine and its potential use as a countermeasure to performance decrement in military sustained operations. Aviat Space Environ Med 1992;63:364-9 [review].

2. Deijen JB, Wientjes CJ, Vullinghs HF, et al. Tyrosine improves cognitive performance and reduces blood pressure in cadets after one week of a combat training course. Brain Res Bull1999;48:203-9.

3. Neri DF, Wiegmann D, Stanny RR, et al. The effects of tyrosine on cognitive performance during extended wakefulness. Aviat Space Environ Med 1995;66:313-9.

4. Banderet LE, Lieberman HR. Treatment with tyrosine, a neurotransmitter precursor, reduces environmental stress in humans. Brain Res Bull 1989;22:759-62.

5. Shurtleff D, Thomas JR, Schrot J, et al. Tyrosine reverses a cold-induced working memory deficit in humans. Pharmacol Biochem Behav 1994;47:935-41.

6. Deijen JB, Orlebeke JF. Effect of tyrosine on cognitive function and blood pressure under stress. Brain Res Bull 1994;33:319-23.

7. Dollins AB, Krock LP, Storm WF, et al. L-tyrosine ameliorates some effects of lower body negative pressure stress. Physiol Behav 1995;57:223-30.

Depression
Dose:

Consult your doctor

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.1 L-tyrosine metabolism may also be abnormal in other depressed people2 and preliminary research suggests supplementation might help.3, 4 Several doctors recommend a 12-week trial of L-tyrosine supplementation for people who are depressed. Published research has used a very high amount-100 mg per 2.2 pounds of body weight (or about 7 grams per day for an average adult). It is not known whether such high amounts are necessary to produce an antidepressant effect.

References

1. Rose DP, Cramp DG. Reduction of plasma tyrosine by oral contraceptives and oestrogens: a possible consequence of tyrosine aminotransferase induction. Clin Chim Acta 1970;29:49-53.

2. Moller SE. Tryptophan and tyrosine availability and oral contraceptives. Lancet 1979;2:472 [letter].

3. Kishimoto H, Hama Y. The level and diurnal rhythm of plasma tryptophan and tyrosine in manic-depressive patients. Yokohama Med Bull 1976;27:89-97.

4. Gelenberg AJ, Wojcik JD, Growdon JH, et al. Tyrosine for the treatment of depression. Am J Psychiatry 1980;137:622-3.

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.

Copyright 2014 Aisle7. All rights reserved. Aisle7.com

The information presented in Aisle7 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 June 2015.

Ratings and Reviews

REVIEW SNAPSHOT®

by PowerReviews
GNC L-Tyrosine 1000
 
3.4

(based on 7 reviews)

67%

of respondents would recommend this to a friend.

Pros

  • Simple to take (5)
  • Acts quickly (4)
  • No side effects (4)
  • Produces results (3)

Cons

    Best Uses

    • Daily use (3)
      • Reviewer Profile:
      • First time user (3), Regular user (3)

    Reviewed by 7 customers

    Sort by

    Displaying reviews 1-7

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    (0 of 1 customers found this review helpful)

     
    3.0

    causes abdominal discomfort

    By fadi.aboona

    from Michigan

    About Me First Time User

    See all my reviews

    Pros

      Cons

      • Abdominal Cramps
      • Bloating
      • Flatulence
      • Gas

      Best Uses

        Comments about GNC L-Tyrosine 1000:

        I'm not sure if anyone is experiencing abdominal discomfort (see cons above) or is it just me!!

        One user above mentioned that he chews the tablet for easier digestion, i will give that a try!!

        (3 of 3 customers found this review helpful)

         
        5.0

        Great support for stressful times

        By elvillajorge

        from Bell Gardens, CA

        About Me Regular User

        See all my reviews

        Pros

        • Acts Quickly
        • Good Taste
        • No Side Effects
        • Produces Results
        • Simple To Take

        Cons

          Best Uses

          • Daily Use
          • Short-Term Solution

          Comments about GNC L-Tyrosine 1000:

          I can tell you this has been a day saver for me when I sleep poorly the night before. I take two tablets and I feel great for most of the day. On normal days, I take only one tablet.

          The only downside is that I have to chew it a bit in order to disintegrate and digest the tablets properly. I love this product, it was the first adaptogen I ever discovered; my wife and I have been using it for 4 years now.

          (0 of 1 customers found this review helpful)

           
          3.0

          Got mixed feelings

          By vprice2006

          from Tampa,Fl.

          About Me First Time User

          See all my reviews

          Verified Buyer

          Pros

          • Acts Quickly
          • Simple To Take

          Cons

          • Causes Side Effects

          Best Uses

            Comments about GNC L-Tyrosine 1000:

            Feel good when taken but after it wears off you feel alittle shaky

            (2 of 4 customers found this review helpful)

             
            2.0

            Not a good formula

            By Wenchess1

            from IN

            See all my reviews

            Pros

            • No Side Effects

            Cons

            • No Results

            Best Uses

              Comments about GNC L-Tyrosine 1000:

              I have a very distinct reaction to good L-tyrosine (and a good form doesn't have to be expensive either). This produced zero effects. It also does not dissolve quickly. Get a capsule form instead.

              (5 of 5 customers found this review helpful)

               
              4.0

              Helpful for Adrenal Deficiencies

              By caroline.e.evans

              from Norfolk, VA

              About Me Regular User

              See all my reviews

              Verified Buyer

              Pros

              • Acts Quickly
              • Produces Results
              • Simple To Take

              Cons

                Best Uses

                • Daily Use

                Comments about GNC L-Tyrosine 1000:

                I have an adrenal deficiency, causing me to suffer from chronic fatigue. I've tried everything - B vitamins, medications, supplements, diet changes (even incorporating hard-to-find foods), cleanses - anything that I heard might help. The best combination I've found is 1500mg L-Tyrosine (which is not made, as far as I can find - I have to buy the 1000mg and the 500mg) 2x daily in conjunction with my medications. The GNC 1000mg is the highest dosage in one pill that I've found. All others are 750mg, maximum. Since I have to take these pills so often, the expense adds up, so it's nice to have the high quality/high dosage available.

                (2 of 2 customers found this review helpful)

                 
                4.0

                Quick, Activating, and Non-Addictive

                By alexander.brooks

                from Bellevue, NE

                About Me First Time User, Health Conscious, Regular User

                See all my reviews

                Pros

                • Activating
                • Acts Quickly
                • No Side Effects
                • Produces Results
                • Simple To Take

                Cons

                • Results Lessen Over Time

                Best Uses

                • As needed
                • Short-Term Solution

                Comments about GNC L-Tyrosine 1000:

                Works well, but there is tolerance to it's effects, needing to increase the dose (like caffeine) to get the anti-fatigue, increased energy and motivation effects.

                (2 of 9 customers found this review helpful)

                 
                3.0

                good dose

                By mrmattoglesby

                from USA

                About Me Medical Professional

                See all my reviews

                Verified Buyer

                Pros

                • No Side Effects
                • Simple To Take

                Cons

                  Best Uses

                  • Daily Use

                  Comments about GNC L-Tyrosine 1000:

                  use to assist tacjling the day after all-nighter. data support its effects but i couldnt really feel anything.

                  Displaying reviews 1-7

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