(S)-2-Aminobutanoic acid hydrochloride is primarily used in the pharmaceutical industry as a chiral building block for the synthesis of various drugs. It serves as a key intermediate in the production of active pharmaceutical ingredients (APIs), particularly those targeting neurological and metabolic disorders. Its enantiomeric purity makes it valuable in the development of enantioselective drugs, ensuring higher efficacy and reduced side effects. Additionally, it is employed in research laboratories for studying amino acid metabolism and protein synthesis. In some cases, it is also utilized in the preparation of nutritional supplements aimed at supporting muscle recovery and overall health.