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Home > Anti-aging Research > L-Tyrosine

L-Tyrosine

Related Topics:

• St. John's wort / 5-HTP / SAMe / NADH / Omega-3 / tyrosine / acetyl-l-carnitine / DHEA / phenylalanine / ginkgo / phosphatidylserine / folate / antidepressants

Specific Recommendations:

• Jarrow N-Acetyl Tyrosine at iHerb
• L-tyrosine products at iHerb
• Vitacost l-tyrosine products
• Drugstore.com/GNC l-tyrosine products

General Information:

• L-Tyrosine - Vitacost Health Library
• L-Tyrosine for Weight Control - Vitacost Health Library
• Tyrosine - The Natural Pharmacist
• Depression Protocol - Life Extension Foundation - "Tyrosine is used by the body to make the neurotransmitters dopamine, norepinephrine, and epinephrine, which play a role in elevating mood and keeping us alert; 500 to 1500 mg a day is recommended"

News & Research:

• 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"
• L-Tyrosine Has No Effect On Endurance - Intelihealth, 11/6/02
• The Essential Amino Acid Reader - Nutrition Science News, 1/01
• 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"
• Natural Remedies for Depression - Nutrition Science News, 2/99

Abstracts:

• N-acetyl-L-tyrosine as a tyrosine source in adult parenteral nutrition - JPEN J Parenter Enteral Nutr. 2003 Nov-Dec;27(6):419-22
• 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"
• 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 or Vitacost l-tyrosine products.
• A comparison of tyrosine against placebo, phentermine, caffeine, and D-amphetamine during sleep deprivation - Nutr Neurosci. 2003 Aug;6(4):221-35

Other possible l-tyrosine retailers:

Related Searches:

• Doctor's Guide search of tyrosine
• Doctor's Guide (2) search of tyrosine
• Intelihealth search of tyrosine
• Life Extension Foundation search
• Medline search of l-tyrosine supplement
• Medscape search of tyrosine
• The Natural Pharmacist search of tyrosine
• Nutrition Science News search
• WebMD search of l-tyrosine

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