To Eileen and to all of my Mayo Connect Family - as to taking NAC (the same one you take) - I have been taking this since January 2019 and when I went in for my usual breathing test in April, I was up 30% from the last 3 tests. I was amazed as the NAC was my only "new" supplement. Clearly it has had an affect on my lung capacity. My lung doctor at Brigham and Womens in Boston told me to keep taking it ( I take two a day); he was aware of NAC but really did not have a lot of information on it for those with MAC, bronchectasis and psedemonas ( all 3 of which I have had or have) . I know doctors at one of the major hospitals in San Francisco have just begun studies on NAC with patients with lung issues - It will be interesting to see how that tracks over the next few years. I have decided to take it for the rest of my life. As to the coming winter ( when I usually get very sick with pneumonia from catching colds from little children) I will be interested to see if I get as sick as I was last December and January, before adding NAC to my regimen. I take one in the AM and one in the PM - I open the capsule and dump the powder into a small glass of smoothie - it has had no side affects for me. I still take 2 puffs of Symbicort twice a day and one puff of Encruse daily. I have another breathing test later this month and I was waiting to see if my lung capacity was still 30% better before writing to the group. Thank you Eileen for this post. I will let you know more after I have the test in late August. Pam