# Delivery of Molecular Hydrogen for Precision Immunomodulation: Mechanisms, Detection Methods, and Applications.
> 分子状水素の精密免疫調節への応用：送達システム・検出法・作用機序の包括的レビュー


## Abstract

This review systematically examines the immunomodulatory properties of molecular hydrogen (H₂), focusing on three areas that prior nanomaterial-oriented reviews have insufficiently addressed: mechanistic pathways, in vivo detection methods, and advanced delivery system classification. H₂ is reported to support immune homeostasis through antioxidant activity, suppression of pro-inflammatory mediators, and inhibition of apoptotic signaling. Two unresolved challenges are highlighted: the incomplete mechanistic understanding of H₂-mediated immune regulation and the absence of precise detection tools needed to establish dose-efficacy relationships in living systems. By consolidating recent advances in H₂ delivery platforms alongside updated detection strategies, the review aims to provide a framework for developing precision immunomodulation approaches that leverage the physicochemical properties of H₂.

### Mechanism

H₂ is proposed to maintain immune homeostasis by selectively scavenging reactive oxygen species, downregulating pro-inflammatory cytokine production, and inhibiting apoptotic signaling cascades, collectively supporting a balanced immune response.

## Bibliographic

- **Authors**: Li G, Cui H, Fan R, Liu GD, Hou Z, Zhang YJ, et al.
- **Journal**: Adv Sci (Weinh)
- **Year**: 2025
- **PMID**: [40619605](https://pubmed.ncbi.nlm.nih.gov/40619605/)
- **DOI**: [10.1002/advs.202500283](https://doi.org/10.1002/advs.202500283)
- **PMC**: [PMC12407266](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12407266/)
- **Study type**: review
- **Delivery route**: mixed routes
- **Effect reported**: not assessed

## Delivery context

This study combines multiple delivery routes. As a general principle, the most efficient route for routine hydrogen intake is inhalation. Inhalation carries explosion risk (empirical LFL of 10%; high-concentration devices are documented in the Consumer Affairs Agency accident database and are not recommended).

## Safety notes

This study combines multiple delivery routes. As a general principle, the most efficient route for routine hydrogen intake is inhalation. Inhalation carries explosion risk (empirical LFL of 10%; 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 40619605. https://h2-papers.org/en/papers/40619605
> **Source**: PubMed PMID [40619605](https://pubmed.ncbi.nlm.nih.gov/40619605/)