L-tyrosine is an amino acid that plays a crucial role in the production of important substances in the body, including neurotransmitters like dopamine, norepinephrine, and epinephrine. It is classified as a non-essential amino acid, meaning the body can produce it from another amino acid called phenylalanine. L-tyrosine is found in various protein-rich foods such as dairy products, meat, fish, eggs, nuts, and beans. It is also available as a dietary supplement, often marketed for its potential benefits in enhancing mood, cognitive performance, and stress response.