Within the brain, a precursor of the neurotransmitters dopamine, norepinephrine and epinephrine (more known as adrenaline). Neurotransmitters are playing an important role in the functioning of the sympathetic nervous system.

Important elements:

- Tyrosine is a precursor of thyroxine, catecholamines and the most important human pigment, melanin.

- It plays an important role in adrenal function, pituitary and thyroid gland.

- Tyrosine is not found in large quantities in the body it is metabolized rapidly.