111 papers
Q: Does molecular hydrogen help with cognitive decline?
A: Of 111 peer-reviewed papers, 73 reported a positive effect (the most common), 8 limited/mixed, 1 negative, 29 not assessed. Study mix: 20 human (9 RCT), 61 animal/basic, 26 meta-analysis or synthesis. The most studied delivery route is inhalation. The above aggregates published research and does not constitute a clinically established conclusion. See the individual paper pages for details and Safety notes for inhalation safety. (last updated 2026-05-15)
| Human | 20 | of which RCT | 9 |
|---|---|---|---|
| Animal/basic | 61 | Synthesis/meta | 26 |
| Reported effect | positive 73 ・ limited/mixed 8 ・ negative 1 ・ not assessed 29 | ||