The Aminopyrine-N-Demethylase (AND) Activity Assay Kit is primarily used to measure the enzymatic activity of cytochrome P450 enzymes, specifically CYP2C19, in biological samples. This assay is crucial in drug metabolism studies, as it helps researchers understand how drugs are processed and metabolized in the liver. It is widely applied in pharmaceutical research to evaluate the potential interactions between drugs and to assess the impact of genetic variations on drug metabolism. Additionally, it is used in toxicology studies to investigate the effects of environmental toxins or chemicals on liver enzyme activity. The kit provides a reliable and efficient method for quantifying enzyme activity, making it a valuable tool in both academic and industrial research settings.