L-Glutamic acid 1-Benzyl Ester is primarily used in peptide synthesis as a protecting group for the carboxyl function of glutamic acid. This esterification helps in preventing unwanted side reactions during peptide bond formation, ensuring the specificity and efficiency of the synthesis process. It is also employed in the preparation of various biologically active peptides and proteins, where selective protection and deprotection of functional groups are crucial. Additionally, it serves as an intermediate in the production of pharmaceutical compounds, particularly those targeting neurological and metabolic disorders. Its role in research extends to studying enzyme mechanisms and receptor interactions, providing insights into biochemical pathways and potential therapeutic targets.