Jarrow Formulas L-Tyrosine Free Form Amino Acid 500mg brain Dopamine norepinephrine epinephrine adrenaline thyroid hormones triiodothyronine T3 and thyroxine T4 stress cold fatigue loss death divorce prolonged work sleep deprivation stress grief
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This supplement contains one hundred capsules; each containing 500mg of the free form amino acid L-Tyrosine. The following excerpts came from this website http://www.ask.com/wiki/Tyrosine under this license http://creativecommons.org/licenses/by-sa/3.0/ The licensor does not endorse us or our use of their content. None of the statements on this page have been evaluated by the FDA this product is not intended to diagnose, treat, cure, or prevent any disease. Nothing on this page is intended to be medical advice or a substitute for medical advice and nothing on this page should be construed in any way as such. The FDA does not allow marketers to make claims that have not been approved by the FDA. The following information is for informational purposes only. Just because it works in some study doesn't guarantee you the exact same results.


"In dopaminergic cells in the brain, tyrosine is converted to l-dopa by the enzyme tyrosine hydroxylase (TH). TH is the rate-limiting enzyme involved in the synthesis of the neurotransmitter dopamine. Dopamine can then be converted into the catecholamines norepinephrine (noradrenaline) and epinephrine (adrenaline).

The thyroid hormones triiodothyronine (T3) and thyroxine (T4) in the colloid of the thyroid also are derived from tyrosine."

"A number of studies have found tyrosine to be useful during conditions of stress, cold, fatigue,[15] loss of a loved one such as in death or divorce, prolonged work and sleep deprivation,[16][17] with reductions in stress hormone levels,[18] reductions in stress-induced weight loss seen in animal trials,[15] improvements in cognitive and physical performance[13][19][20] seen in human trials; however, because tyrosine hydroxylase is the rate-limiting enzyme, effects are less significant than those of L-DOPA."


Parts of the bottle read as follows: "Other Ingredients: Cellulose, magnesium stearate (vegetable source) and silicon dioxide. Capsule consists of gelatin"

No wheat, no gluten, no soybeans, no dairy, no egg, no fish/shellfish, no peanuts/tree nuts"


Best by 05/15.

The warnings on the bottle read as follows:

"Note: If you have a medical condition (especially bipolar or a history of malignant melanoma), are pregnant, lactating, trying to conceive, under the age of 18, or taking medications (especially MAO inhibitors), consult your healthcare professional before using this product."

"Keep out of the reach of children"

  • 100 capsules:
  • 500 milligrams:
  • gluten free:
  • supports synthesis of brain neurotransmitters:
  • Manufacturer: Jarrow Formulas

Jarrow® Formulas L-Tyrosine Free Form Amino Acid

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