Baseline gut microbiota composition, particularly microbial hydrogen-producing capacity, may modify individual responses to hydrogen supplementation on sleep quality
In a randomized, double-blind, placebo-controlled trial of 44 healthy adults with poor sleep quality, hydrogen-rich jelly did not significantly improve sleep outcomes in the overall analysis. However, when participants were stratified by baseline abundance of hydrogen-producing bacteria (e.g., Bacteroides), those with lower abundance showed greater improvement in sleep quality and mental stress, suggesting a microbiome-dependent effect.
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Baseline gut microbiota composition, particularly microbial hydrogen-producing capacity, may modify individual responses to hydrogen supplementation on sleep quality The current body of evidence comprises 1 study, including 1 randomized controlled trial. EvidenceHub rates the overall confidence at 44/100 (low).
The Claim
Baseline gut microbiota composition, particularly microbial hydrogen-producing capacity, may modify individual responses to hydrogen supplementation on sleep quality
This conclusion is most relevant to: Healthy adults with poor sleep quality (n=44).
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Individual variability in hydrogen-producing microbes influences the response to hydrogen supplementation on sleep quality: a randomized, double-blind, placebo-controlled, parallel study. (Scientific reports, 2026) —
How It Works
The proposed biological pathway:
- ▸Hydrogen exerts antioxidant and anti-inflammatory effects
- ▸Hydrogen-producing bacteria in the gut (e.g., Bacteroides) may influence systemic hydrogen levels
- ▸Baseline abundance of these bacteria modifies individual response to hydrogen supplementation
- ▸Greater improvement in sleep quality and mental stress observed in those with lower hydrogen-producing bacteria
Who Might Benefit
Evidence fit by population:
- ▸Healthy adults with poor sleep quality (n=44)
Recommended Dose
N/A (hydrogen-rich jelly, dose not specified in abstract)
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Exploratory findings, not confirmatory; hypothesis-generating
- ▸Small sample size (n=44) limits generalizability
- ▸No significant overall effect, only subgroup interaction effects
Frequently Asked Questions
Does hydrogen supplementation improve sleep quality in healthy adults?▼
In this study, hydrogen-rich jelly did not significantly improve sleep quality in the overall group of healthy adults with poor sleep. However, a subgroup analysis suggested that individuals with lower baseline levels of hydrogen-producing gut bacteria may benefit more.
What role do gut bacteria play in the effect of hydrogen on sleep?▼
The study found that gut microbiota composition, specifically the abundance of hydrogen-producing bacteria like Bacteroides, influenced the response to hydrogen supplementation. Participants with fewer such bacteria showed greater improvements in sleep quality and mental stress.
Was this study a randomized controlled trial?▼
Yes, it was a randomized, double-blind, placebo-controlled, parallel study with 44 healthy adults, registered in the UMIN Clinical Trial Registry.
What were the main limitations of this study?▼
The findings are exploratory and based on a small sample size. No significant overall effect was found, and the subgroup results require confirmation in larger studies.
References
- 1.Higashikawa F, Kanno K. “Individual variability in hydrogen-producing microbes influences the response to hydrogen supplementation on sleep quality: a randomized, double-blind, placebo-controlled, parallel study..” Scientific reports, 2026. PMID: 42509250 DOI: 10.1038/s41598-026-52342-9