Used in biochemical research as a substrate or inhibitor in enzyme assays, particularly for proteases and amidases. Serves as a building block in peptide synthesis due to its protected amidated form, facilitating the study of arginine-containing peptides. Also employed in studies related to nitric oxide pathways, given arginine’s role as a precursor, though the amidated derivative may be used to modulate reactivity or stability. Its hydrochloride salts improve solubility and handling in aqueous-based experiments.