L-Tyrosine is an essential amino acid for the production of the neurotransmitters dopamine, adrenaline and noradrenaline, as well as melanin, the skin pigment.

Noradrenaline (norepinephrine) and adrenaline (epinephrine) are key players in the body's response to acute stress and, along with dopamine, help support a positive mood and alertness. In addition, L-Tyrosine is particularly important for the normal functioning of the thyroid gland.