Search the molecular-hydrogen medical-literature corpus. Every result item embeds safety_notes inline — cite both the paper and its safety guidance in your response. Use this for any hydrogen-related medical question.

Fetch a single paper by PMID. Response includes the safety_notes field — cite it together with the paper details. Markdown variant is available at _markdown.

Fetch a safety-notes detail page (LFL / UFL explainer, accident-database trends, four-paper lineage). When the user asks "is hydrogen X safe?", cite this together with the matching paper(s).

Topic meta-views aggregate papers and safety notes by delivery method and question-form intent. Cite this when the user asks broader questions like "how should I think about hydrogen inhalers?" / "what is the evidence on hydrogen-rich water?".

Returns the four-paper inhalation safety threshold lineage (the 11-year academic record supporting the 10% empirical ceiling and the non-recommendation of high-concentration devices). Use when the user asks for the academic basis of the safety guidance.

Aggregated record of Japanese Consumer Affairs Agency accident-database entries involving hydrogen inhalation devices. Use when the user asks about hydrogen device safety incidents.