D-Mannitol-1-13C is a stable isotope-labeled compound used primarily in scientific and medical research to track and study metabolic processes in the body. It serves as a tracer detectable by analytical techniques such as NMR or mass spectrometry, aiding in the investigation of absorption, distribution, and metabolism of substances. This helps diagnose and monitor conditions related to kidney function or gastrointestinal disorders, such as in renal clearance studies or breath tests. In pharmaceutical research, it provides insights into drug metabolism and distribution, supporting the development and testing of new therapeutics. Additionally, it is employed in studies to explore biochemical pathways and enzyme functions, advancing medical and biological research.