Houghton, C A, Steels, E L, Fassett, R G et al. · Phytomedicine : international journal of phytotherapy and phytopharmacology · 2011 · DOI
Researchers tested whether a supplement containing an antioxidant enzyme called SOD could reduce fatigue in women aged 50-65 years over 12 weeks. The supplement did not reduce fatigue more than placebo, and blood tests showed no meaningful differences in oxidative stress markers or antioxidant levels between the treatment and placebo groups.
This study directly examines oxidative stress as a potential therapeutic target in fatigue syndromes, including the spectrum leading to ME/CFS. Although the supplement was ineffective, the negative result provides important data about whether plant-derived antioxidants can meaningfully improve fatigue or reduce oxidative stress markers in affected populations.
This study does not prove that oxidative stress is unrelated to fatigue pathogenesis—only that this particular supplement formulation at this dose did not reduce fatigue or oxidative stress markers in this population. The findings do not establish whether other antioxidant interventions, higher doses, longer treatment durations, or application to people with severe ME/CFS would be similarly ineffective.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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