L-Tyrosine

L-Tyrosine is a non-essential amino acid that serves as a precursor to several important neurotransmitters, including dopamine, norepinephrine, and epinephrine, as well as thyroid hormones. Research suggests that L-tyrosine supplementation may help support cognitive performance under stressful or demanding conditions, with studies indicating benefits for working memory, mental flexibility, and sustained attention particularly when cognitive resources are depleted. Some evidence also points to its role in supporting mood regulation and healthy thyroid function, given its involvement in the synthesis of key signaling molecules. The two most common supplemental forms are free-form L-tyrosine and N-acetyl L-tyrosine, with research generally showing that free-form L-tyrosine is more efficiently utilized by the body for raising circulating tyrosine levels.