L-Aspartic acid-¹³C₄（Cat No.:I044979）is a stable isotope-labeled amino acid in which all four carbon atoms are enriched with carbon-13. It is commonly used in metabolic flux analysis, tracer studies, and NMR or mass spectrometry-based research to investigate amino acid metabolism, nitrogen cycling, and the tricarboxylic acid (TCA) cycle. As a non-essential, proteinogenic amino acid, L-aspartic acid also plays a role in neurotransmission and biosynthesis of other amino acids and nucleotides. The ¹³C₄ label enables precise tracking in cellular and in vivo systems. Supplied at high purity for advanced biochemical and metabolic research applications.