DL-Kynurenine is primarily used in research settings to study metabolic pathways, particularly those involving tryptophan metabolism. It serves as a key intermediate in the kynurenine pathway, which is crucial for understanding various biological processes, including immune response, neurological function, and inflammation. Researchers utilize DL-Kynurenine to investigate its role in the production of metabolites like kynurenic acid and quinolinic acid, which have implications in neurodegenerative diseases, psychiatric disorders, and cancer. Additionally, it is employed in studies exploring the regulation of immune tolerance and its potential therapeutic applications in autoimmune diseases and infections.