<qa>  What is the most widely used statin in the US?Study objective The objective of this study is to compare the oxidative stress lowering capacity of atorvastatin, the most widely used statin in the US, with that of simvastatin in a population of patients with increased oxidative stress in patients with diabetes mellitus 10, hypertension 11 obesity 12 and chronic kidney disease 13 who are known to have increased oxidative stress. 