O-Acetyl-L-tyrosine is primarily used in the pharmaceutical and nutraceutical industries as a precursor for the synthesis of L-tyrosine, a conditionally essential amino acid. It is often employed in dietary supplements to support cognitive function, improve focus, and reduce stress, particularly in individuals under high physical or mental strain. Additionally, it is utilized in research settings to study neurotransmitter synthesis, as it plays a role in the production of dopamine, norepinephrine, and epinephrine. In cosmetic formulations, it is sometimes included for its potential antioxidant properties and ability to support skin health. Its acetylated form enhances stability and bioavailability, making it a preferred choice in various applications.