# L-Tyrosine

45.33mg/lb…100mg/kg…150lb=6800mg/day

NOW L-Tyrosine

The amino acid Tyrosine is produced in the body from Phenylalanine. Tyrosine is a precursor to L-DOPA (L-3,4-dihydroxyphenylalanine), which then converts into Dopamine. Dopamine then has a chance to stimulate synthesis of Norepinephrine or even further synthesis Epinephrine. Dopamine, Norepinephrine, and Epinephrine are known as catecholamine.

Physical Stress Reliever

Physical stessors are proven to decrease brain catecholamines resulting is a decrease in cognitive function. These physical stressors can include physical exertion, lack of sleep, malnutrition, injury, fatigue and excessive cold, heat or humidity. Tyrosine helps prevent decline in cognitive function due to physical stressors by increasing catecholamine levels.

Continuous stress often leads to a loss of neurons primarily in the hippocampus. The hippocampus is a component of the brain responsible for long-term and short-term memory. Cognitive impairments that result from stress can be noticed through memory loss, strained thinking capability, and loss of judgment.

Tyrosine reverses a cold-induced working memory deficit in humans.

In a study by the Thermal Stress Adaptation Program, Naval Medical Research Institute test tyrosine supplementation against short-term memory impairment from cold stress. Cold stress lowers brain catecholamines which leads to this memory impermanent. Patients were given 150 mg/kg of L-tyrosine and were given a delayed matching to sample memory test in 22$^{\circ}$C and 4$^{\circ}$C. At 4$^{\circ}$C the placebo resulted in a severe decrease in matching accuracy where as with tyrosine supplementation it matched results seen in 22$^{\circ}$C. Tyrosine significantly improved matching accuracy under substantial cold stress. Supplementation at 22$^{\circ}$C had no effect.

Treatment with tyrosine, a neurotransmitter precursor, reduces environmental stress in humans.

In a study by the U.S. Army Research Institute of Environmental Medicine, 100mg/kg of tyrosine was tested against cold stress and oxygen deprivation. “Tyrosine significantly decreased symptoms, adverse moods, and performance impairments in subjects who exhibited average or greater responses to these environmental conditions.”

The effects of tyrosine on cognitive performance during extended wakefulness.

In a study by the Naval Aerospace Medical Research Laboratory in Pensacola FL, 150mg/kg of tyrosine were given to patients who had to complete diligent tasks for over 24 hours without sleep. Tyrosine supplementation resulted in better performance lasting for 3 hours compared to patients with the placebo. Tyrosine helps counteract performance decrementation due to sleep deprivation.

Blood Pressure Reduction

Tyrosine improves cognitive performance and reduces blood pressure in cadets after one week of a combat training course.

In a study by the Department of Clinical Neuropsychology, Vrije Universiteit, cadets were given 10g of tyrosine daily and testing on a combat training course. Those who were given tyrosine performed better during memory and tracking tasks. They also experienced a decrease in blood pressure. Higher blood pressure as a result of stress and fatigue seems to have been lowered by tyrosine supplementation.

# Tyrosine Product

NOW L-Tyrosine Capsules Pure L-Tyrosine Capsules

45 Grams
Serving Size 1 Capsule(500mg)
Servings Per Container 250
 L-Tyrosine .5 g (500 mg)