Doctors Best Tyrosine is a conditionally essential amino acid that is a precursor to the catecholamine transmitters dopamine epinephrine and norepinephrine. These are vital messengers for the brain and the bodys other nerve networks. The thyroid gland also needs tyrosine to make the vital hormone thyroxine.
Doctors Best LTyrosine supplies the pure Lform of tyrosine an amino acid that has many important functions in the body. Tyrosine or 4hydroxyphenylalanine is one of the 22 amino acids that are used by cells to synthesize proteins.

