D-Phenylalaninamide hydrochloride is primarily used in biochemical research and pharmaceutical development. It serves as a key intermediate in the synthesis of peptides and other bioactive compounds. This chemical is often employed in studies related to enzyme inhibition, receptor binding, and metabolic pathways, particularly those involving amino acids. Its role in the production of chiral molecules makes it valuable in the development of enantiomerically pure drugs. Additionally, it is utilized in the preparation of diagnostic agents and in the investigation of neurological disorders, where phenylalanine derivatives play a significant role.