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Adequate hydration with hydrogen-rich water pre-exercise reduced blood lactate levels and improved exercise-induced decline of muscle function. Studies also suggest that the hydroxyl radical scavenger H2 effectively reduces oxidative stress in patients with rheumatoid arthritis.
Studies from the National Library of Science
Pilot study: Effects of drinking hydrogen-rich water on muscle fatigue caused by acute exercise in elite athletes
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3395574/
Consumption of water containing a high concentration of molecular hydrogen reduces oxidative stress and disease activity in patients with rheumatoid arthritis: an open-label pilot study.
https://www.ncbi.nlm.nih.gov/pubmed/23031079
Supplementation of hydrogen-rich water improves lipid and glucose metabolism in patients with type 2 diabetes or impaired glucose tolerance.
https://www.ncbi.nlm.nih.gov/pubmed/19083400