The study investigated the neuroprotective effects of hydrogen (H₂) therapy in animal models and human clinical studies experiencing neurodegenerative damage caused by oxidative stress.
Hydrogen was administered by three methods—H₂ gas inhalation, ingestion of H₂-dissolved water, and injection of H₂-dissolved saline—and acted primarily by selectively reducing highly toxic oxygen radicals (·OH) and peroxynitrite.
Hydrogen therapy significantly reduced oxidative stress and inflammation in brain ischemia–reperfusion injury (IRI) and other neurodegenerative diseases (p < 0.05), demonstrating neuroprotective effects and being proposed as a clinically safe and effective therapeutic alternative.