Rac-3-Aminoisobutyric Acid-d3 Hydrochloride is primarily used in research and analytical applications as a labeled compound. Its deuterium atoms make it valuable in metabolic studies, where it serves as a tracer to investigate biochemical pathways and amino acid metabolism. This compound is particularly useful in NMR spectroscopy and mass spectrometry, enabling researchers to track and analyze the distribution and transformation of metabolites in biological systems. It also aids in the development of diagnostic tools and therapeutic strategies by providing insights into metabolic disorders and drug interactions. Additionally, it is employed in the synthesis of isotopically labeled peptides and proteins for structural and functional studies.