Hydrogen-rich water is marketed as an easy antioxidant win, but a randomized, blinded trial in people with chronic mountain sickness found the opposite signal. After 8 weeks of 990 mL/day, the hydrogen group's MDA, a marker of oxidative damage, rose more than placebo's, by +2.11 (p < 0.001). Total antioxidant capacity rose too, and the MDA increase was larger in people with a BMI of 24 or higher. Adverse events were more common with hydrogen water (50% vs 37%), mostly dizziness. The study was small and specific to altitude patients, so here is what it does and doesn't mean for hydrogen water fans.
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