Used as a selective inhibitor of nitric oxide synthase (NOS), particularly inducible NOS (iNOS), in research settings to study the role of nitric oxide in inflammatory and immune responses. Helps in investigating conditions such as septic shock, arthritis, and other inflammatory diseases by modulating NO levels. Also employed in biochemical assays to differentiate between constitutive and inducible forms of NOS. Its sulfate salt form improves stability and solubility in aqueous solutions, making it suitable for in vitro and in vivo studies.