Used as a stable isotope-labeled internal standard in mass spectrometry and gas chromatography for accurate quantification of linolenic acid in biological samples. Enables precise tracking of metabolic pathways involving omega-3 and omega-6 fatty acids. Supports research in lipidomics, metabolic studies, and nutritional science by providing a reliable reference for isotopic analysis. Helps differentiate endogenous versus exogenous fatty acid sources in metabolic tracing experiments.