In the adrenal gland, Tyrosine is converted to levodopa by the enzyme Tyrosine Hydroxylase (TH). TH is also the rate-limiting enzyme involved in the synthesis of the catecholamine hormones dopamine, norepinephrine (noradrenaline), and epinephrine.
The thyroid hormones triiodothyronine (T3) and thyroxine (T4) in the colloid of the thyroid also are derived from tyrosine.
Here are L-Tyrosine products available direct from the United States. For people in the UK who wish to import these (this is allowed by customs, as they are for your own personal use), please check the exchange rate with this link to XE.com
L-Tyrosine by Solaray
L-Tyrosine
This product is an amino acid produced naturally by a microbiological fermentation process and is an essential component of protein found naturally in the human body. Click for more information and to purchase
L-Tyrosine
This product is an amino acid produced naturally by a microbiological fermentation process and is an essential component of protein found naturally in the human body. Click for more information and to purchase
L-Tyrosine by Source Naturals
L-Tyrosine
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, for thyroid hormones, and for and enkephalins, special peptides which subdue messages of physical discomfort. L-Tyrosine is also a precursor for the protective skin pigment melanin. Click for more information and to purchase
L-Tyrosine by Natures Plus
L-Tyrosine 500 mg
Nature's Plus is the first to offer a 100% pure L-Tyrosine capsule together with its synergistic partner, Vitamin B-6. Vitamin B-6 is an integral cofactor in the body's utilization of L-Tyrosine. Amino Acids, the famed building blocks of protein, are essential to the formation of muscle tissue and mass. They have widespread involvement in a range of bodily functions, including efficient brain function and the manufacture of energy. Click for more information and to purchase
L-Tyrosine 500 mg
Nature's Plus is the first to offer a 100% pure L-Tyrosine capsule together with its synergistic partner, Vitamin B-6. Vitamin B-6 is an integral cofactor in the body's utilization of L-Tyrosine. Amino Acids, the famed building blocks of protein, are essential to the formation of muscle tissue and mass. They have widespread involvement in a range of bodily functions, including efficient brain function and the manufacture of energy. Click for more information and to purchase
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