Recent progress toward hydrogen medicine: potential of molecular hydrogen for preventive and therapeutic applications.
Level 5 - mechanism / opinion, no new human data
Narrative review summarizing preclinical mechanisms and early clinical literature without systematic search methodology.
PubMed 21736547 · doi:10.2174/138161211797052664
What was done
Narrative review evaluating the research progress of molecular hydrogen (H2) since 2007. The authors outline administration methods—including gas inhalation, drinking hydrogen-dissolved water, saline injection, topical application, and intestinal bacterial production—and summarize reported biological mechanisms.
What was found
The abstract reports no numerical effect sizes or quantitative outcome measures. It states that biological effects have been described across more than 38 disease models, physiological states, and preliminary clinical tests, demonstrating antioxidant, anti-inflammatory, and antiallergic effects along with altered gene expression and protein phosphorylation.
Why it matters
Synthesizes early preclinical and emerging translational interest in molecular hydrogen as a potential low-toxicity antioxidant that diffuses rapidly without disrupting basal metabolic redox signaling.
Limits
As a non-systematic narrative review, it lacks formal study selection criteria, risk of bias grading, and pooled quantitative analyses. The specific molecular mechanisms explaining biological effects from very low concentrations of H2 remain uncharacterized in this report.
Cited by
- supports Hydrogen gas is the smallest molecule in existence and is instantly diffusible through the gut wall.