(±)-Catechin-2,3,4-13C3 is primarily used in research and analytical applications as a labeled compound for tracing and studying metabolic pathways. Its isotopic labeling with carbon-13 allows scientists to track its incorporation and transformation in biological systems, making it valuable in studies related to plant biochemistry, antioxidant mechanisms, and polyphenol metabolism. It is also employed in pharmacokinetic studies to understand the absorption, distribution, and excretion of catechin derivatives in the body. Additionally, this labeled compound aids in the development of analytical methods, such as mass spectrometry and nuclear magnetic resonance (NMR) spectroscopy, for accurate detection and quantification of catechin and its metabolites in complex matrices.