N-Acetyl Tyrosine is a derivative of the amino acid L-Tyrosine. Plain L-Tyrosine is less stable and also less soluble in water which can result in reduced bioavailability. Acetylation enhances its solubility and stability. Nutricost's N-acetyl L-Tyrosine capsules contain 350mg in every capsule. They are manufactured in a GMP compliant FDA registered facility.