What was studied?
Forty healthy adult volunteers entered a randomized, double-blind, placebo-controlled trial of oral glutathione. The investigators measured urinary oxidative-stress markers and several erythrocyte glutathione measurements; 39 participants completed the per-protocol study.
What did the researchers report?
The groups did not show significant differences in the principal oxidative-stress biomarkers at four weeks. Total reduced and oxidized glutathione measurements and their ratio were also unchanged in the reported analysis.
What are the limits?
Biomarker selection, duration and baseline health can influence results, but these factors do not justify treating a null outcome as proof of benefit. This study differs from the longer body-store trial already in the library and does not establish effects of catalog vials or other formulations.
Original editorial summary by Sulan Peptide. Based on the source abstract; consult the full paper for methods, analyses, funding and disclosures.