N-Acetylcysteine (NAC) is an over the counter supplement that has been utilized by clinicians for years to treat acetaminophen (Tylenol) overdose, as a mucolytic, and for other medical problems. There is compelling research that NAC may also reduce the severity of viral infections like influenza, and perhaps reduce the risk of blood clots (thromboembolism) as well. Could NAC be effective in COVID-19? Dr. Seheult illustrates these ideas and discusses the peer-reviewed data involved.