Supports Brain Function. N-Acetyl Tyrosine is an acetylated derivative of the amino acid L-tyrosine. Ordinary L-tyrosine is less stable and also less soluble in water which may result in reduced bioavailability. Acetylation enhances the solubility and stability of certain amino acids. N-Acetyl Tyrosine supports brain function by improving the synthesis of the catecholamines norepinephrine and dopamine (neurotransmitters).