Your Gut Bacteria May Determine If Hydrogen Therapy Improves Your Sleep
- Authors
- Fumiko Higashikawa, Keishi Kanno
- Journal
- Nature Scientific Reports
- Year
- 2026
- DOI
- 10.1038/s41598-026-52342-9
- Study Type
- Human
- Outcome
- Neutral
- Peer Reviewed
- Yes
- Country
- Japan
- Health Condition
- Poor Sleep Quality
- Body System
- Nervous System
TL;DR
Hydrogen-rich jelly did not improve sleep overall, but exploratory findings suggest benefits may depend on baseline gut hydrogen-producing bacteria.
Key Finding
Hydrogen supplementation did not significantly improve sleep quality overall in healthy adults, but people with fewer hydrogen-producing bacteria in their gut showed greater sleep improvements with hydrogen treatment.
Summary
This study tested whether hydrogen-rich jelly could improve sleep quality in 44 healthy adults with poor sleep. Overall, the hydrogen supplement did not significantly improve sleep compared to placebo. However, the researchers discovered that people with lower levels of hydrogen-producing bacteria in their gut (microbes that naturally produce hydrogen) showed greater sleep improvements when taking hydrogen, suggesting that individual differences in gut bacteria may determine who benefits from hydrogen supplementation.
Practical Takeaway
This early-stage human study suggests that gut bacteria composition may influence how individuals respond to hydrogen supplementation, but the overall lack of benefit in the full group and the small sample size mean more research is needed before drawing conclusions about hydrogen's effectiveness for sleep. The findings raise an interesting hypothesis about personalized responses, but larger studies are required to confirm whether testing someone's gut bacteria could help predict who might benefit from hydrogen.
Abstract
Hydrogen has been reported to exert antioxidant and anti-inflammatory effects, and its potential health benefits have been investigated. However, to our knowledge, evidence regarding its impact on sleep quality in healthy individuals remains extremely limited. In addition, the influence of inter-individual variability in the gut microbiota on hydrogen efficacy has seldom been studied. In this study, we aimed to assess the impact of hydrogen-rich jelly on sleep quality and examine the influence of gut microbiota on this effect. A total of 44 healthy adults with poor sleep quality were randomized to receive either hydrogen-rich jelly or placebo jelly. No significant differences were observed between the intervention groups in the changes in sleep-related outcomes, including OSA-MA, VAS, PSQI, and STAI scores, in the overall analysis. Notably, when participants were stratified by the mean change in the VAS score for sleep quality, gut microbiota β-diversity showed apparent clustering in the hydrogen group but not in the placebo group. This cluster was explained by the differences in the relative abundance of hydrogen-producing bacteria, such as Bacteroides. Linear mixed-effects model analyses revealed significant interaction effects in the group × H2-producers in the VAS for sleep quality and mental stress, with greater improvement in participants with a lower abundance of hydrogen-producing bacteria. In conclusion, these exploratory findings raise the hypothesis that baseline gut microbiota composition, particularly microbial hydrogen-producing capacity, may modify individual responses to hydrogen supplementation. This hypothesis warrants confirmation in larger studies to explore its implications for microbiome-informed stratification in future hydrogen intervention research.Clinical trial registration: This clinical trial was registered with the University Hospital Medical Information Network Clinical Trial Registry on 27/12/2023 (UMIN-CTR, UMIN000053237).