Wow, I am so glad I decided to go back and read this thread from the first post. I clicked on the link in your very first post and read this:

Secondly, an unexpectedly dangerous compound to avoid is N-acetylcysteine (NAC), a high-priced product heavily recommended by alternative medical doctors and other health practitioners. NAC is a form of cysteine often recommended as a more powerful form of the much-needed amino acid L-cysteine or in lieu of glutathione, an antioxidant that is rarely effective in supplement form.66 Although dozens of journal articles support its short-term use as immunity booster and detoxifier, evidence is mounting of potential long-term harm. The NAC form of cysteine conceivably can poison vitalethine, a vital component needed to activate humoral immunity.67-69




I have an unopened bottle of NAC that I just bought and was going to start taking. Glad I read this post again. True or not true I think I will avoid it for now.