NOW L-Tyrosine 500mg (120 caps)

Shop all NOW Foods SKU# 42360 Weight: 0.2 lb

More Views

MSRP: $15.99

Special Price $8.13

Availability: Out of stock

Earn 9 reward points. (Details)

Ask a question
Neurotransmitter Support, Supports Mental Alertness

Have a question about this product? 800-266-2323

You may also be interested in the following product(s)

Details

Details

Neurotransmitter Support, Supports Mental Alertness

*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.

Reviews

Ratings

10.0

Love it

Price

Value

Quality

Reviews

Reviewed by 1 customers
By Anonymous
10.0
Price
Quality
Value

1 Item(s)

Add Your Rating

Quality

Price

Value

Pros

Cons

Nick Name

Email

Bottom Line

 

Health Notes

Disclaimer: The following content is provided by Aisle7 and is for informational purposes only. It is based on scientific studies, clinical experience, or usage as cited in each article. Hi-Health provides this information as a service but does not endorse it. In addition, Aisle7 does not recommend or endorse any specific products.

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 © 2018 Healthnotes, Inc. All rights reserved. www.healthnotes.com

Learn more about Healthnotes, the company.

The information presented by 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. Self-treatment is not recommended for life-threatening conditions that require medical treatment under a doctor's care. 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 December 2018.

Supplemental Facts

Ingredients

NOW Foods L-Tyrosine 500mg (120 caps)

Additional Information

Additional Info


As a dietary supplement, take 1 capsule 1 to 3 times daily, preferably between meals. Consider taking this product in combination with NOW® L-Phenylalanine and Acetyl L-Carnitine.


WARNINGS: Persons with thyroid disease (hyperthyroidism), melanoma, or those taking MAO inhibitors or other mood altering medications should seek the advice of a physician before consuming this product.


Q&A

Product Questions

No Questions

Optim Rewards Program

With Optim Rewards, you start earning points on every item you purchase! Every time you collect 100 points, you’ll receive a reward.

It’s easy to start earning points! Here’s how it works:

  • You become a member of the rewards program with your first purchase.
  • Earn 1 point for every dollar you spend!
  • Earn double points on Hi-Health products!

Our new 3-in-1 program allows you to earn and spend rewards three ways — shop in stores, online or by phone.