# Hydrogen intervention attenuates chronic hypoxia-induced bone degeneration and multi-organ damage via modulation of the gut microbiota.
> 腸内細菌叢の調節を介した水素介入による慢性低酸素誘発性骨変性および多臓器障害の軽減


## Abstract

A mouse model of chronic hypoxic exposure simulating 5500 m altitude for 4 months was used to assess the protective capacity of hydrogen-rich water (HRW) and coral calcium hydride (CCH) against bone deterioration and multi-organ damage. Progressive bone loss induced by prolonged hypoxia was substantially reduced by HRW administration. Inflammatory and histological damage in the liver, lungs, kidneys, and colon were likewise attenuated. Hypoxia decreased gut microbiota diversity and reduced the abundance of aerobic and beneficial bacteria such as Lactobacillus; hydrogen intervention partially reversed this dysbiosis. At the molecular level, hypoxia upregulated HIF-1α, RANKL, and TRAP expression in bone tissue while suppressing Nrf2 protein, yet hydrogen intervention did not directly modify these markers. The findings suggest that bone-protective effects are mediated through the gut-bone axis via restoration of microbiota homeostasis and reduction of systemic inflammation and oxidative stress, rather than through direct modulation of classical hypoxia signaling pathways.

### Mechanism

Hydrogen intervention restores gut microbiota homeostasis and reduces systemic inflammation and oxidative stress via the gut-bone axis, thereby protecting bone without directly modulating classical hypoxia signaling molecules such as HIF-1α, RANKL, or TRAP.

## Bibliographic

- **Authors**: Zhu SL, Hao DP, Chen Y, Shi Z, Zhong Y, Zhang F, et al.
- **Journal**: Bone
- **Year**: 2026
- **PMID**: [41224067](https://pubmed.ncbi.nlm.nih.gov/41224067/)
- **DOI**: [10.1016/j.bone.2025.117718](https://doi.org/10.1016/j.bone.2025.117718)
- **Study type**: animal study
- **Delivery route**: hydrogen-rich water
- **Effect reported**: positive

## Delivery context

Hydrogen-rich water is a low-risk delivery route, but the achievable systemic hydrogen dose is bounded. For clinical applications, inhalation is the most efficient route; inhalation, however, carries explosion risk, and concentration matters (empirical LFL of 10% applies to inhalation environments; high-concentration devices are documented in the Consumer Affairs Agency accident database and are not recommended).

## Safety notes

Hydrogen-rich water is a low-risk delivery route, but the achievable systemic hydrogen dose is bounded. For clinical applications, inhalation is the most efficient route; inhalation, however, carries explosion risk, and concentration matters (empirical LFL of 10% applies to inhalation environments; high-concentration devices are documented in the Consumer Affairs Agency accident database and are not recommended).

See also:
- [Inhalation concentration and LFL / UFL](https://h2-papers.org/en/safety-notes/inhalation-concentration)
- [Consumer Affairs Agency accident cases](https://h2-papers.org/en/safety-notes/accident-cases)
- [Inhalation safety threshold lineage](https://h2-papers.org/en/safety-notes/lineage)

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> **Cite as**: H2 Papers — PMID 41224067. https://h2-papers.org/en/papers/41224067
> **Source**: PubMed PMID [41224067](https://pubmed.ncbi.nlm.nih.gov/41224067/)