L-Tyrosine is utilized for the synthesis of catecholamine neurotransmitters such as norepinephrine (NE) epinephrine(E) and dopamine (DA). . Dietary supply of Tyrosine influences the concentrations of the brain neurotransmitters NE E and DA. Tyrosine is also the precursor for melanin (human pigment) and major hormones such as the thyroids hormone thyroxine. Also Tyrosine is useful in the formation of amino-sugars compounds that are critical to integrity of tissue and body functions.. Jarrow formulas L-Tyrosine is the pure crystalline amino acid from biological fermentation. It is NOT derived from milk..Other products from HerbsPro