L-Tyrosine

Tyrosine: It is a constituent of protein amino sugars and amino lipids which have important roles throughout the body. It is important to brain nutrition because it is a precursor of the neurotransmitters dopamine, norepinephrine and epinephrine. It is also an important part of peptides such as enkephalins, which serve as pain relievers in the brain. It is the precursor for hormones such as thyroxine and catecholestrogens (chemicals that are both oestrogens and catecholamines) and for the major human pigment, melanin.