https://www.verywellhealth.com/the-benefits-of-n-acetylcysteine-89416
I took it for awhile but found it created too much mucus in my lungs. Your mileage may vary.

Regarding NAC.
Some people, BE patients, take it to help thin out the mucus.
Some people take it daily and as well a product that is the same as Mucinex which is Guaifenesin: For clearing stubborn mucus. They are sure not to take one that is labeled with DM, dextromethorphan.
Again, as you have heard on the threads, we are all different and it works for some and not for others. Trial and error most of the time, as in many things.
Barbara