Hey Wayne, yes I've read a bunch about the glutamate toxicity issue too, but no I've not tested that and so I wouldn't know for sure. Can it be done with a blood test? And would it even be accurate since it's in the brain?
I told my GP about my response to opioids and she thought it may be the same as the Klonopin response issue some people have. I don't know if that's hitting the same toxoicity, because from what I've read about the response people get with klonopin, it's nowhere close to being as effective as what I and others are experiencing with opioids.
I took lots of NAC many years ago, in the beginning, and didn't notice a thing. But then I was severely ill at that time. may be different now......you know how we respond to things differently over time.