L-Tyrosine 500mg x 90 capsules

zoom
L-Tyrosine 500mg x 90 capsules

Supplementation with L-tyrosine may heighten brain function and help offset fatigue.

£12.95

Code: 0659
Weight: 0.12kg

Availability: In stock

  • Products Details
  • Reviews (0)
  • Delivery & Returns

L-tyrosine is a precurser of dopamine and thus supplementation may heighten brain function and help offset fatigue. Obese and depressed persons frequently have low blood levels of this amino acid. 

 

Cognitive and motor performance are critical in many circumstances and are impaired by sleep deprivation. The authors administered placebo, tyrosine 150 mg/kg, caffeine 300 mg/70 kg, phentermine 37.5 mg and D-amphetamine 20 mg at 15:30 h following overnight sleep deprivation and compare their effects on cognitive and motor performance in healthy young men. Tests of visual scanning, running memory, logical reasoning, mathematical processing, the Stroop task, four-choice serial reaction time, time wall take, pursuit tracking, visual vigilance, Trails (B) task and long-term memory were evaluated at standardized intervals before, during and after sleep deprivation and drugs. Performance decrements with sleep deprivation occurred in visual scanning, running memory, logical reasoning, mathematical processing, the Stroop test, the time wall test, tracking and visual vigilance. Interestingly, with sleep deprivation some tests improved and others did not deteriorate. Improvements with medication following sleep deprivation were seen in running memory, logical reasoning, mathematical processing, tracking and visual vigilance. Although less effective than D-amphetamine, tyrosine improved performance on several tests. We conclude that all drugs tested improved at least some aspects of cognitive and motor performance after sleep deprivation. As a naturally occurring amino acid, and thus amenable to nutritional strategies, tyrosine may deserve further testing.

— Magill, R. A., et al. Effects of tyrosine, phentermine, caffeine D-amphetamine, and placebo on cognitive and motor performance deficits during sleep deprivation. NutriNeurosci. 6(4):237-246, 2003. Pennington Biomedical Research Center, Baton Rouge, LA, USA.

Reviews

Reviews

DELIVERY

Most orders are sent by either 1st class Royal Mail or if requested by FedEx or UPS.

We aim to dispatch orders received before 2pm (UK time) on the same day, excluding weekends and national holidays.

Next day delivery applies to working days only, guaranteed if a courier is selected and the order is received before 2pm.

 

RETURNS

If you have changed your mind about keeping an item we understand and we happily accept returns within 30 days, as long as the item is unopened and returned in original condition we are happy to provide a full refund for the item or exchanged for goods of the same value.  Please note that due to the hygienic nature of some oral and body care products we are unable to accept items back where the packaging seal has been breached. If you have received a faulty item or an item in error, we will see to it that you receive the correct item at no extra cost. Please use the "contact us" page and we will be happy to help.

Related products

asphalia logo rayonex logo
BSI quality logo
Payment Logo
Sitemap© 2017 Health Leads UK Ltd. eCommerce by LGM Creative