Lithium deuteroxide solution is primarily used in nuclear chemistry and research, particularly in the study of deuterium-based reactions. It serves as a deuterium source in the synthesis of deuterated compounds, which are essential for nuclear magnetic resonance (NMR) spectroscopy. This allows for detailed analysis of molecular structures and dynamics. Additionally, it is employed in the preparation of heavy water (D2O) and other deuterium-labeled materials, which are crucial in neutron moderation and nuclear reactor applications. Its role in isotopic labeling also supports advancements in pharmaceuticals and biochemistry, enabling the study of metabolic pathways and drug interactions.