Millions of Americans use hand sanitizers every day and it is widely believed that they safely kill bacteria. The U.S. Food and Drug Administration has now investigated to find out if that's really true. The agency Wednesday requested makers of hand sanitizersto provide data showing the products' active ingredients. The agency stated " it's our responsibility to determine whether these products are safe and effective so that consumers can be confident when using them" So far they have found that levels of antiseptic ingredients in users' urine and blood are higher than usual and it raises questions regarding absorption, since these antiseptics aren't washed off