It is found in protein-rich foods. Your body uses phenylalanine to make tyrosine, which helps produce hormones and neurotransmitters, including melanin, dopamine, norepinephrine, and thyroxine.

It’s naturally found in protein-rich foods, including eggs, beans, tofu, and fish, and is also available as a dietary supplement. Since L-tyrosine does play a role in producing dopamine and ...