DL-Leucine-d10 is primarily used in research and development within the fields of biochemistry and pharmaceuticals. It serves as a stable isotope-labeled compound, making it valuable for metabolic studies and tracer experiments. Scientists utilize it to investigate amino acid metabolism, protein synthesis, and nutrient uptake in biological systems. Its deuterium labeling allows for precise tracking and analysis in mass spectrometry and NMR spectroscopy, aiding in the development of new drugs and therapeutic strategies. Additionally, it is employed in nutritional studies to understand the role of leucine in muscle growth and recovery, particularly in sports science and dietary supplement formulation.