Hi @lorifilipek ...In response to your question regarding NAC, I have had no negative responses to the supplement, only good results. Also, I have found the 7% saline solution to be very helpful. I had my GP call in a script to our local medical pharmacy (they carry the nebulizing units) as well as the saline...Sodium Chloride Inhalation Solution, USP 7% .... 4 ml twice a day). The other thing I take that I have really found helpful is an herb, Astragalus. It is an adaptogenic herb...It works on so many levels and is beneficial to the lungs in clearing congestion but the big advantage I found is that I have not gotten sick since taking it for several years now. It boosts the immune system. Good luck on your path with these bugs and Best Wishes!! Kate