Big pharma doesn’t like the idea of NAC being feely available (any more than they like the idea of ivermectin being readiy available) because it is a very useful treatment for certain conditions that competes with certain drugs sold by big pharma which are much more expensive. Big pharma wants medical tyranny over us to protect their profits.
I know of a few co-workers and friends who used NAC to get over extended coof problems(coughs, lung congestion, smell issues, etc). All anecdotal, of course.
Sounds about right.