Used as a stable isotope-labeled internal standard in mass spectrometry and nuclear magnetic resonance (NMR) studies to track metabolic pathways and reaction mechanisms. Its isotopic labeling allows precise quantification and differentiation from naturally occurring benzyl alcohol in pharmaceutical and biochemical research. Commonly applied in drug development for tracing the fate of benzyl-containing compounds in biological systems, ensuring accurate measurement without interference from background signals. Also utilized in kinetic studies to investigate enzymatic reactions and degradation processes where carbon tracking is essential.