L-Kynurenine sulfate salt is widely used in biochemical research to study the kynurenine pathway, which plays a critical role in tryptophan metabolism. It serves as a key intermediate in the biosynthesis of NAD+ and other metabolites involved in immune regulation and neurological functions. Researchers utilize it to investigate its role in neurodegenerative diseases, such as Alzheimer’s and Parkinson’s, as well as its impact on immune responses and inflammation. Additionally, it is employed in cell culture studies to explore its effects on cellular processes and signaling pathways. Its application extends to drug development, where it is used to screen potential therapeutic agents targeting the kynurenine pathway.