D-Arginine is primarily used in research and pharmaceutical applications. It serves as a key component in the study of enzyme mechanisms and metabolic pathways, particularly those involving nitric oxide synthase. In drug development, D-Arginine is utilized to create enantiomerically pure compounds, which are essential for producing medications with specific biological activities. Additionally, it is employed in the synthesis of peptides and proteins, aiding in the exploration of their structure and function. D-Arginine also finds use in the development of diagnostic agents and as a chiral building block in organic synthesis, contributing to the creation of novel therapeutic agents.