Used as a stable isotope-labeled tracer in metabolic studies to track the fate of propionate in biological systems. Enables precise analysis of metabolic pathways such as gluconeogenesis, fatty acid synthesis, and amino acid metabolism. Employed in research involving gut microbiota, where it helps monitor short-chain fatty acid metabolism. Also utilized in nuclear magnetic resonance (NMR) and mass spectrometry (MS) for quantitative and qualitative analysis due to its isotopic purity. Common in pharmaceutical and biochemical research for studying metabolic disorders and energy metabolism.