NAC info, benefits, dosage....
https://draxe.com/nutrition/n-acetylcysteine-nac-supplement-benefits/
Not a bad article, and includes this:
“reducing production of inflammatory cytokines and proteins”
But a study found that “low” doses increase production and “high” doses reduce production. Thus the quandry. I guess take as much as you can tolerate, within reason
BTW, the black spots you find in many NAC capsules are not mold; these are places that are beginning to oxidize. Still ok to take them. And likely there will be a sulfurous odor: this is normal.