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
That is why in clinic matters: supervised delivery means the right route, careful monitoring, and a plan that can be adjusted safely
In addition, it has long been known that GSH is capable of forming disulfide bonds with cysteine residues of proteins, and the relevance of this mechanism (S-glutathionylation) in regulation of protein function has been well documented in a number of research fields
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