Tyrosine is one of the 20 amino acids that are used by cells to synthesize proteins. This is a non-essential amino acid and it is found in casein.L-Tyrosine is a free-form amino acid which rapidly crosses the blood-brain barrier. It is a precursor for the neurotransmitters dopamine, norepinephrine, and epinephrine, as well as for thyroid hormones and enkephalins.
Tyrosine is also a constituent of amino sugars (glycosaminoglycans), special compounds which have important roles throughout the body.
L-Phenylalanine is an essential amino acid that can be readily converted into the amino acid tyrosine. Because tyrosine is necessary for the synthesis of proteins and the production of the neurotransmitters dopamine and norepinephrine, Phenylalanine is an extremely important nutrient that must be obtained through the diet or by supplementation.
Tyrosine Dosage: 100 to 500mg, pref. in the mornings.
Phenylalanine Dosage: 100 to 500mg, pref. in the mornings.
More: http://www.raysahelian.com/tyrosine.html and
en.wikipedia.org/wiki/Tyrosine
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