I am no chemist, no background in it at all but I try to thoroughly vet anything I put into my body.
I supplement for some pretty specific reasons, I have issues with anxiety and mood swings, brain fog, and low energy levels.
Beyond NAC I also supplement inositol, Maca root, D3, zinc/copper, magnesium, L-theanine, and glycine.
I also take DHEA off and on in small 2-3 day stretches each month because I'm over 40, but I'm wary of messing with hormones so I try to keep it minimal.
I'm going to be introducing piracetam soon to combat brain fog, and will report back when I have results.