D-Lysine Methyl Ester Dihydrochloride is used in biochemical research as a reagent for studying enzyme activity and protein interactions. It serves as a substrate or inhibitor in enzymatic assays, helping to understand the mechanisms of lysine-specific enzymes. In peptide synthesis, it acts as a building block for creating modified peptides, which are essential for drug development and studying biological pathways. Additionally, it is utilized in the preparation of chiral compounds, aiding in the exploration of stereochemistry in organic and medicinal chemistry. Its applications also extend to the development of potential therapeutic agents targeting diseases related to lysine metabolism.