L-tyrosine is an amino acid that's often used in supplements to improve cognitive function affected by stress. Supplements containing L-tyrosine supplements may also help treat phenylketonuria (PKU).

Tyrosine, a non-essential amino acid, is vital for the production of neurotransmitters like dopamine, norepinephrine, and epinephrine. These neurotransmitters play an essential part in regulating ...