Safety Definitions | Efficacy | Environment | Proper Use | Safety Getting the full story - tips for evaluating health science findings Adverse events are localized at the site of application When inhaled or ingested, QACs interact with cell membranes at the point of contact. Most important, no apparent metabolism or [systemic] distribution is involved in QAC action. Do Quats Get Absorbed? …Systemic exposure to BAC in antimicrobial soap is very low and below the level of concern identified by the U.S. Food and Drug Administration (500 ng/L) even under maximal use conditions. Human Health Impact Study “Quaternary ammonium compounds (Quats) are a large class of … chemicals that are used in a variety of consumer and industrial products for their antimicrobial properties.”