All iS Clinical products go through a rigorous testing procedure that confirms they pose no infection risk to the user and that they meet anti-microorganism governmental requirements. Laboratory testing is done in-house to provide the strictest quality control and to demonstrate product stability in a variety of situations. Once the user touches the container or product with their finger, however, the potential for contamination is introduced, since human skin harbors a wide variety of microorganisms. There are, therefore, federal regulations governing the required inclusion of antimicrobials (preservatives) in cosmetic products.