At around 500mg/day, they are rarely reported, but as intake approaches 1,000mg/day or higher, gastrointestinal complaints become more likely.67 In one study, about 6% of patients at 1,000mg/day experienced GI issues, and a few discontinued the trial as a result.43 Still, research suggests these digestive side effects are often temporary, fading as the body adapts, especially when people start with smaller doses and build up gradually.37 67 Long-term use The best safety data come from ALS studies, where patients took 2,000mg/day (1g twice daily) for up to 18 months.38 42 Roughly 20% experienced gastrointestinal side effects, but most were able to continue by lowering their dose.67 Longer exposure has not been systematically studied, so the safety of multi-year supplementation remains unknown

2,3 We sought to understand whether patients prescribed these medications were at an increased risk of thyroid cancer in the five years after their initial diabetes diagnosis compared to patients prescribed insulin, another frequently prescribed medication for the treatment of type 2 diabetes
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What are their limitations
Redox reactions Glutathione participates in redox reactions, neutralizing free radicals and preventing cellular damage caused by oxidative stress