N-Acetyl-L-tyrosine

N-Acetyl-L-tyrosine (CAS No.: 537-55-3) is an acetylated derivative of the non-essential amino acid L-tyrosine that functions as a soluble tyrosine precursor and bioactive metabolite widely utilized in biomedical research and nutritional formulations. Owing to its enhanced aqueous solubility relative to L-tyrosine, it is commonly employed in parenteral nutrition and intravenous supplementation, particularly in settings where oral intake is inadequate or contraindicated. Beyond its nutritional role, N-Acetyl-L-tyrosine has emerged as an endogenous regulator of mitochondrial stress responses, capable of passive cellular uptake and modulation of mitochondrial membrane potential, leading to controlled generation of reactive oxygen species and activation of adaptive signaling pathways, including FoxO and Keap1, which subsequently promote antioxidant gene expression and cytoprotective programs. Experimental studies indicate that it can influence cellular redox homeostasis, energy metabolism, and stress resilience, with reported effects on heat stress tolerance, lipid peroxidation, and hormonal stress markers in animal models, as well as inhibition of tumor growth in xenograft systems. Although precise molecular targets and quantitative potency metrics such as IC50 or EC50 values are not well defined, its biological activity is generally observed within low micromolar to millimolar concentration ranges depending on the system studied. N-Acetyl-L-tyrosine is therefore broadly applied in cell-based assays and in vivo models investigating oxidative stress, metabolic disorders, aging, and cancer biology, with dosing and experimental conditions tailored to specific research objectives.