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However, as we age or face environmental stressors, our natural levels can begin to decline

On this site you can find an in-depth study dedicated to each molecule.

Two Previous studies [1, 25] addressing NAC use were limited to only modest doses of NAC (6001200 mg/day) and short duration of treatment (8 weeks) and showed a 32% significant improvement in glutathione peroxidase levels and a 6% improvement in pain score, with a recommendation of the use of higher doses of NAC for longer duration

They found that GGT, even at physiologic levels within the normal range, was associated with increased all-cause mortality, cardiovascular mortality, and possibly cancer mortality