Thompson 500Mg L-Phenylalanine Capsules, 2 Count

What the brand says

L-Phenylalanine is an essential, nine-carbon amino acid and is a precursor to the amino acid tyrosine. Because tyrosine is necessary for the synthesis of proteins and the production of the neurotransmitters dopamine and norepinephrine, phenylalanine is an extremely important nutrient that must be obtained through the diet or supplementation. As the building blocks of protein, amino acids are vital to health.