DL-3-Phenylserine Hydrate is primarily used in the synthesis of pharmaceuticals, particularly in the production of antibiotics and other therapeutic agents. It serves as a key intermediate in the preparation of compounds that exhibit antimicrobial and antifungal properties. Additionally, it is utilized in the development of drugs targeting neurological disorders, as it plays a role in the biosynthesis of neurotransmitters. In research, it is employed as a building block for the study of enzyme mechanisms and protein interactions. Its application extends to the field of organic chemistry, where it is used in asymmetric synthesis and chiral resolution processes.