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‚ special peptides which subdue messages of physical discomfort. Tyrosine is also a precursor for the protective skin pigment melanin.
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