My son and I were unknowingly exposed to toxic mold for a few years. He developed Tourette's/tics and I developed CFS. After going to numerous doctors, we are pretty much on our own as far as detoxing and healing our bodies goes. NAC is highly recommended on all the blogs I read so I tried it the past month. I keep it in the fridge, hoping to avoid other reviewers saying black spots grew in the pills. So far, no black spots. I did notice eczema flares after I take the NAC and extremely itchy skin. So I stopped taking it. Tried it again and same thing. Happened about 5 times so I don't think my body likes it or not sure. My son has trouble swallowing large pills so he chews this…lol and says it's extremely sour. He's been taking it for 2 weeks, once a day to start, with activated charcoal 2 hours later. Although his tics haven't improved, I do notice his moods have been better. He's less depressed and I see him laughing with his friends more and more each day. I will keep him on it and I will try again for myself next month