We use superior science to make smarter formulas like Jarrow Formulas® L-Tyrosine, a free form amino acid that supports brain function. This formula contains pure crystalline l-tyrosine. A constituent of dietary protein, L-tyrosine is a substrate or precursor to the catecholamine neurotransmitters norepinephrine, epinephrine, & dopamine, the levels of which can be affected by the amount of tyrosine consumed. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.