Used for the quantitative measurement of betaine levels in biological samples such as serum, plasma, and urine. This kit is commonly applied in metabolic research, particularly in studies related to liver function, fatty acid metabolism, and cardiovascular health. It supports investigation into conditions like non-alcoholic fatty liver disease (NAFLD), insulin resistance, and homocysteine metabolism. The assay enables high-throughput analysis in clinical and research laboratories, providing reliable data for understanding the role of betaine as an osmolyte and methyl donor in cellular processes.