DL-Leucine-isopropyl-d7 is primarily used in research and development, particularly in the field of biochemistry and pharmacology. It serves as a stable isotope-labeled compound, making it valuable in metabolic studies and drug development. Researchers utilize it to trace and analyze metabolic pathways, providing insights into how substances are processed within biological systems. Additionally, it is employed in the synthesis of labeled peptides and proteins, aiding in the study of protein structure and function. Its deuterated form enhances precision in mass spectrometry and NMR spectroscopy, making it a crucial tool for accurate molecular analysis.