I believe this was attempted at the start of covid once doctors saw some of the initial mechanisms. I want to say they stopped this because it caused downstrea

I believe this was attempted at the start of covid once doctors saw some of the initial mechanisms. I want to say they stopped this because it caused downstream problems and complications with covid but I can't recall what. I believe it was Dr. Roger Seheult and another doctor discussing this on Medcram but he releases so many videos I can't find the specific one.