Is Hydrogen Therapy Safe? Research Shows High Safety Profile
Biological Safety of Hydrogen
Research hubs: Digestive System · Respiratory System
- Evidence type
- Review or commentary
- Authors
- Qiang Sun, Wenjie Han, Atsunori Nakao
- Journal
- Hydrogen Molecular Biology and Medicine
- Year
- 2015
- Study Type
- clinical
- Delivery
- inhalation
- Outcome
- positive
- Peer Reviewed
- Yes
- Cited by
- 9 (OpenAlex, as of November 2026)
- Country
- China
TL;DR
Scientists studied whether hydrogen gas is safe for humans and found that it's super safe—your body actually makes some hydrogen naturally in your gut, divers have breathed it without problems, and governments haven't found any toxic effects. The main takeaway: hydrogen looks really promising for medical uses, but scientists will keep watching to make sure it doesn't cause unexpected problems down the road.
Key Finding
Hydrogen demonstrates high biosafety for humans based on diving research, its natural production in the gut, and regulatory data showing no acute or chronic toxicity under normal pressure conditions.
Summary
This review examines the safety of hydrogen for human use by looking at three types of evidence: research on people who breathe hydrogen while diving, the fact that hydrogen is naturally produced in the human gut, and government safety data. The review concludes that hydrogen appears very safe based on these sources, with no evidence of acute (sudden) or chronic (long-term) toxicity. However, the authors note that because hydrogen does have biological effects in the body, there remains a theoretical possibility of unintended side effects that warrants ongoing monitoring.
Practical Takeaway
This is a safety review rather than a clinical study, so it does not test hydrogen water's effectiveness for any health condition. While the evidence suggests hydrogen is well-tolerated by the human body, the authors acknowledge that more monitoring is needed since any biologically active substance could potentially cause unexpected effects. Anyone considering hydrogen water should consult their healthcare provider, especially if they have existing health conditions.
Abstract (excerpt)
Based on three main reasons, the biosafety of hydrogen is very high: The first is evidence from medical research on hydrogen diving, the second is that hydrogen is an endogenous gas, and the third is direct research on the biosafety of hydrogen. Research on hydrogen diving, combined with human…