The effects of ingestion of hydrogen-dissolved alkaline electrolyzed water on stool consistency and gut microbiota: a double-blind randomized trial.
Tanaka Y, Kiuchi M, Higashimura Y, Naito Y, Koyama K · Medical gas research · 2021
Research-use notice
Independent study record
Each H2HUBB study page organizes source-linked research details for educational use. Interpretation should remain proportional to the study design, population, controls, and limitations.

The publication “The effects of ingestion of hydrogen-dissolved alkaline electrolyzed water on stool consistency and gut microbiota: a double-blind randomized trial.” is organized in H2HUBB under the research focus hydrogen water gut microbiome study 2021. The publication is cited as Tanaka Y, Kiuchi M, Higashimura Y, Naito Y, Koyama K, Medical gas research, 2021. This uncontrolled human study examined The effects of ingestion of hydrogen-dissolved alkaline electrolyzed water on stool consistency and gut microbiota: a double-blind randomized trial. The abstract describes Human participants; hydrogen delivered as hydrogen water; reported duration 2 weeks. This is an automated editorial draft based on the abstract and requires source review before publication.
Hydrogen water gut microbiome study 2021 overview
A double-blind, randomized study was conducted to evaluate the connection between stool consistency and change in gut microbiota composition induced by drinking hydrogen-dissolved AEW. Because this is human clinical evidence, relevance depends on participant selection, controls, sample size, treatment duration, adherence, outcome measures, and replication.
Study design and hydrogen intervention
Publication type: Uncontrolled human study. Evidence type: Human clinical evidence. Research model or population: Human participants. Randomized: Yes. Blinding: Double-blind. Control status: Unknown.
Delivery method: Hydrogen water. Dose or treatment amount: 500 mL. Treatment duration: 2 weeks.
Reported findings and scientific interpretation
For this hydrogen water gut microbiome study 2021, the study record reports the following: No detailed finding statement was available for this record. Readers should consult the original publication before drawing conclusions.
These findings should be interpreted as one piece of evidence rather than as a stand-alone medical conclusion. Results can be influenced by the research model, study design, treatment protocol, sample size, outcome selection, statistical methods, and whether the findings have been independently reproduced.
How this research record was prepared
H2HUBB organizes bibliographic details, study design information, intervention data, outcomes, limitations, and safety notes from the available scientific source. Automated classification supports database organization, but it does not replace critical reading of the complete paper. Source identifiers, evidence labels, and delivery-method fields are retained so readers can verify the record and compare it with related publications. A missing field means the information was unavailable or not reported in the structured source; it should not be treated as a negative finding.
Limitations, safety, and original source
Limitations: The abstract alone may not report all methodological limitations; full-text review is required.
Safety: The abstract did not provide detailed safety or adverse-event information.
This H2HUBB page is an educational research record, not medical advice. Review the original scientific source for the complete methods and results. Continue exploring the H2HUBB Molecular Hydrogen Research Library to compare evidence types, delivery methods, and related topics.