3-Phenyl-L-serine is primarily utilized in the synthesis of pharmaceuticals, particularly in the development of drugs targeting neurological disorders. It serves as a key intermediate in the production of compounds that modulate neurotransmitter activity, aiding in the treatment of conditions like depression and anxiety. Additionally, it is employed in the creation of peptide-based therapeutics, where its unique structure enhances the stability and efficacy of the peptides. In research, 3-Phenyl-L-serine is used to study enzyme mechanisms and protein interactions, providing insights into biochemical pathways. Its role in organic synthesis also extends to the development of chiral molecules, which are crucial in producing enantiomerically pure substances for various medical applications.