This is an open question: How often do you take NAC?
For me it's a pretty damn powerful supplement. If I take it more than 3 days in a row I feel seasick. If I skip it for 3 weeks and then take 1 it's like "woah!".
I don't wanna take it too often then, in fact recently I've been taking it (600mg/day, the usual dose) mondays, tuesdays, and wednesdays. 3 on. 4 off. This seems to achieve good things.
Perhaps the feeling sick is due to too much antioxidants, which is supposed to inhibit some vital processes like autophagy. Perhaps we should seek to keep the antioxidants level "just so" it seems.