General safety observations from published health sources show: Oral glutathione is well tolerated in moderate doses Long-term use does not suppress natural production No evidence suggests dependency or rebound effects Side effects are rare and usually mild Mild side effects, when they occur, may include bloating or headache, often linked to excessive dosing rather than duration of use
For each study, Cohens d was derived from the difference between pre- and post-intervention mean scores, divided by the pooled standard deviation (SD) of the pre- and post-intervention values
A randomised controlled trial found that consistent vitamin K intake actually improved INR stability
SAM and SAH were quantified using a method adapted from Blaise et al
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Instead, prescription volumes grew, according to an October 2025 analysis from life sciences research firm Iqvia