I don’t know if it hurts but I take a couple capsules out of the bottle and let them sit out for about 24 hours. It seems to help with the odor.
I always order NAC in bulk or powder form, the fresher it is the more it reaks of sulfur which is a good indication as this is what you want in order to do what it is designed for. If it no longer smells it usually is old. Never mind the smell, just hold your nose (just kidding) When you use powder you always can mix it in with something else, along with your vitamin C.