Theory and Research Emerging Theories That May Help Us Solve the COVID-19 Puzzle Free Radicals, Antioxidants in Disease and Health Molecular Hydrogen as an Emerging Therapeutic Medical Gas for Neurodegenerative and Other Diseases Molecular Hydrogen Recent Progress Toward Hydrogen Medicine: Potential of Molecular Hydrogen for Preventive and Therapeutic Applications Molecular hydrogen: new antioxidant and anti-inflammatory therapy for rheumatoid arthritis and related diseases Hydrogen-rich Water Supplementation of hydrogen-rich water improves lipid and glucose metabolism in patients with type 2 diabetes or impaired glucose tolerance Pilot study: Effects of drinking hydrogen-rich water on muscle fatigue caused by acute exercise in elite athletes The role of hydrogen in Alzheimer’s disease Improvement of psoriasis-associated arthritis and skin lesions by treatment with molecular hydrogen: A report of three cases