Only large clinical trials will tell. Side Effects and Toxicity NAC has been used safely at doses up to 11,000 mg a day, but side effects can occur. No drug interactions were reported from the NIH study. PWAs with a history of ulcers should perhaps avoid NAC, since it can reduce mucous that they need to protect their stomachs. NAC is a chelating agent, and may purge minerals from your body.
Nutritionists recommend keeping track of minerals and taking some supplements if necessary.
What We Carry The Health Group imports pharmaceutical grade NAC from Switzerland and Germany. In the US, several companies make NAC and sell it through health food stores. We don't know. Health food store NAC can be cheaper. Health food products are manufactured with no FDA monitoring to guarantee the quality.