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Anti-aging Research > L-Tyrosine
L-Tyrosine
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News & Research:
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Eat
spinach or eggs for faster reflexes: Tyrosine helps you stop faster -
Science Daily, 2/11/14 - "The participants had two
sessions in the test lab. On one occasion they were given orange to drink that
contained tyrosine, and on the other occasion the orange juice contained a
placebo. The tests showed that the candidates performed better on the stopping
task if they had drunk the juice with tyrosine ... Tyrosine food supplements and
tyrosine-rich food are a healthy and inexpensive way of improving our
intellectual capabilities. This makes them preferable to Ritalin and Modafinil,
products that students often reach for to improve their academic performance.
Tyrosine is safe and doesn't need a doctor's prescription" - See
n-acetyl tyrosine at Amazon.com
 .
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Hope for
muscle wasting disease - Science Daily, 11/22/11 -
"The amino acid L-tyrosine had a "rapid and dramatic
impact" on Nemaline Myopathy (NM) in laboratory tests on mice, significantly
improving symptoms of the muscle wasting disease ... consuming L-tyrosine could
significantly improve muscle strength and mobility in NM, raising the
possibility it also could be effective in a range of other muscular dystrophies
... What's more, the rapid and dramatic impact of L-tyrosine in NM mice also
raises the possibility the supplement may be beneficial for dystrophy patients
and other muscle degenerative conditions"
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Get the diet scoop: 6 promising supplements, 6 to avoid - CNN, 2/16/07 -
"promising ...
Caffeine ... EGCG
...
Chromium ... Conjugated
Linoleic Acid (CLA) ...
5-HTP ... L-dopa or
L-tyrosine"
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L-Tyrosine Has No Effect On Endurance
- Intelihealth, 11/6/02
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The Essential Amino Acid Reader - Nutrition Science News, 1/01
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Catecholamines Kick Out the Demons of Depression - Life Enhancement
Magazine, 7/99 - "the amino acid
phenylalanine converts to tyrosine, which transforms to dopamine.
Dopamine is the immediate precursor of noradrenaline (see Figure 1).
Dopamine deficiency is implicated in some forms of psychosis and abnormal
movement disorders, such as Parkinson's disease ... when noradrenaline is
insufficiently present, a person's mood or energy levels may decline, even
bottom out - for example, in depression ... One way to ensure sufficient
levels of these essential neurotransmitters is by consuming their nutrient
precursors via supplementation. Phenylalanine can be taken as a nutrient
supplement and neurotransmitter precursor to noradrenaline. Tyrosine does
not provide the same uplifting benefits as phenylalanine, because the latter
is required for the production of a metabolite, PEA, whose mood-elevating
properties augment those of noradrenaline ... Most of the mental failings
that often accompany aging, such as loss of memory, loss of mental alertness
and energy, tendency toward depression, vulnerability to stress, and
Alzheimer's and Parkinson's diseases, are associated with reduced levels of
noradrenaline or dopamine ... There is a growing body of both anecdotal
evidence and clinical observations showing that phenylalanine supplements
can alleviate the symptoms of some forms of depression. It can also boost
various aspects of mental function in healthy people who wish to maximize
their ability to stay that way ... For the replenishment of noradrenaline, a
phenylalanine supplement would be effective"
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Natural Remedies for Depression - Nutrition Science News, 2/99
Abstracts:
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Effects of Five Amino Acids
(Serine, Alanine, Glutamate, Aspartate, and Tyrosine) on Mental Health in
Healthy Office Workers: A Randomized, Double-Blind, Placebo-Controlled
Exploratory Trial -Nutrients 2022 Jun 6 - "The
importance of maintaining good mental health with overall well-being has
recently drawn attention from various spheres of academics and the working
population. Amino acid intake has been reported to reduce depression symptoms
and other mental health problems. However, the effectiveness of amino acid
intake (i.e., single or combined) remains unknown. In this study, we assessed a
combination of five amino acids (serine, alanine, glutamate, aspartate, and
tyrosine; SAGAT) reported to regulate mental health ... The current findings
suggest that SAGAT contributes to maintaining proper motivation and cognitive
function" - See serine at Amazon.com,
beta-alanine at Amazon.com, glutamate supplements at Amazon.com,
aspartate supplements at Amazon.com,
and
n-acetyl tyrosine at Amazon.com.
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N-acetyl-L-tyrosine as a tyrosine source in adult parenteral nutrition -
JPEN J Parenter Enteral Nutr. 2003 Nov-Dec;27(6):419-22
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Reduction of Brain Dopamine Concentration With Dietary Tyrosine Plus
Phenylalanine Depletion - Am J Psychiatry 160:1887-1889, October 2003 -
"Healthy male subjects were scanned on two occasions:
once after receiving a balanced amino acid drink and once after receiving a
drink mixture from which tyrosine and
phenylalanine were omitted ... Dietary tyrosine and phenylalanine
depletion increased [11C]raclopride binding in the striatum by a mean of 6%.
The change in [11C]raclopride binding correlated significantly with the fall
in the ratio of tyrosine and phenylalanine to large neutral amino acids"
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Effects of tyrosine, phentermine, caffeine D-amphetamine, and placebo on
cognitive and motor performance deficits during sleep deprivation
- Nutr Neurosci. 2003 Aug;6(4):237-46 -
"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 ... Although less effective than D-amphetamine, tyrosine improved
performance on several tests ... tyrosine may deserve further testing"
- See
iHerb
l-tyrosine products.
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A comparison of tyrosine against placebo, phentermine, caffeine, and
D-amphetamine during sleep deprivation
- Nutr Neurosci. 2003 Aug;6(4):221-35
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