# Molecular hydrogen enhances osteogenesis in Danio rerio embryos.
> 水素富化水がゼブラフィッシュ胚の骨形成に与える促進効果


## Abstract

Zebrafish (Danio rerio) embryos, valued for their transparency, small size, and rapid development, were used as an in vivo model to investigate the effects of molecular hydrogen on bone formation. Hydrogen-rich water (HRW) at concentrations up to 15% did not adversely affect embryo viability or growth rate. Exposure to 7% HRW significantly increased vertebral mineralization, indicating enhanced osteogenesis. These findings support the notion that molecular hydrogen exerts anabolic effects on bone tissue in a living organism, complementing prior in vitro evidence.

### Mechanism

Exposure to 7% hydrogen-rich water increased vertebral mineralization rate in zebrafish embryos, suggesting that molecular hydrogen stimulates anabolic bone metabolism and enhances osteogenesis in vivo.

## Bibliographic

- **Authors**: Carnovali M, Mariotti M, Banfi G
- **Journal**: J Fish Biol
- **Year**: 2021
- **PMID**: [33410131](https://pubmed.ncbi.nlm.nih.gov/33410131/)
- **DOI**: [10.1111/jfb.14670](https://doi.org/10.1111/jfb.14670)
- **Study type**: animal study
- **Delivery route**: hydrogen-rich water
- **Effect reported**: positive
- **H2 concentration**: 7–15%

## 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)

---

> **Cite as**: H2 Papers — PMID 33410131. https://h2-papers.org/en/papers/33410131
> **Source**: PubMed PMID [33410131](https://pubmed.ncbi.nlm.nih.gov/33410131/)