Statins are a group of drugs that are used to treat high blood cholesterol levels. These cholesterol-lowering medications block HMG-CoA reductase, an important enzyme that mediates the formation of cholesterol by the liver, thereby reducing the levels of bad cholesterol or LDL (low density lipoprotein)-cholesterol in the blood. There could be a relationship between two completely different entities '“ statin drugs used in the treatment of high cholesterol levels and vitamin D, a hormone that keeps our bones strong, suggests researchers.