Used as a nutritional supplement in parenteral (intravenous) feeding solutions to provide essential amino acids when oral intake is not possible. Serves as a precursor in the synthesis of neurotransmitters and other biologically active compounds in research settings. Employed in cell culture media to support the growth of mammalian cells. Also utilized in the pharmaceutical industry as an intermediate in the production of aspartame and certain drugs. Its hydrochloride form improves solubility and stability in aqueous formulations.