(S)-2-Amino-3-guanidinopropanoic acid dihydrochloride is primarily used in biochemical research and pharmaceutical development. It serves as a precursor or intermediate in the synthesis of more complex organic compounds, particularly those with potential therapeutic applications. Its structure, featuring both amino and guanidinium groups, makes it valuable in studying enzyme mechanisms and protein interactions, especially in the context of arginine metabolism. Additionally, it is employed in the development of peptide-based drugs, where its functional groups can enhance binding affinity or stability. In laboratory settings, it is also utilized as a reagent for modifying or labeling biomolecules to investigate biological processes.