Thiourea-13C is widely used as a labeled compound in various research and analytical applications. It serves as a tracer in metabolic studies, helping scientists understand biochemical pathways and processes in living organisms. Its isotopic label allows for precise tracking and quantification in complex biological systems. Additionally, it is employed in nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry as a reference standard, aiding in the accurate identification and analysis of chemical structures. In environmental research, it is utilized to study the degradation and transformation of thiourea derivatives in ecosystems. Its stable isotope labeling also makes it valuable in pharmaceutical research for drug metabolism and pharmacokinetic studies.