The Complex I Activity Assay Kit is widely used in research to measure the activity of NADH:ubiquinone oxidoreductase, a key enzyme in the mitochondrial electron transport chain. It is essential for studying mitochondrial function and dysfunction, particularly in diseases like Parkinson's, Alzheimer's, and other neurodegenerative disorders. Researchers use this kit to assess the impact of drugs, toxins, or genetic modifications on mitochondrial health. It is also employed in metabolic studies to understand energy production and oxidative stress. The kit provides a reliable, sensitive, and straightforward method for quantifying Complex I activity in various biological samples, including tissues, cells, and isolated mitochondria.