DL-Methionine (CAS No 59-51-8) is an amino acid commonly used in biomedical research belonging to the category of essential sulfur-containing amino acids It plays a critical role in protein synthesis and is a key precursor in the biosynthesis of cysteine taurine and glutathione DL-Methionine influences several metabolic pathways such as the transmethylation and transsulfuration pathways and often targets cellular oxidative stress mechanisms In vitro DL-Methionine exhibits activity in the nanomolar to low micromolar range It is widely utilized in studies involving cell models including hepatocytes and neurons and animal models to investigate its effects on metabolic disorders liver function and oxidative stress It also serves in drug screening processes to understand its potential therapeutic benefits Experimental concentrations typically depend on the specific research design