Ultraviolet (UV) light has a long-standing track record in use as an antimicrobial. But the primary limitation to using UV light in relation to the human body is that it can also potentially damage its cells. A group of researchers at the Cedars-Sinai Medical Center in Los Angeles, Calif., known as the Medically Associated Science and Technology (MAST) team, is now researching safe UV technology for use in COVID-19 treatment.