Peer-reviewed research

The science behind hydrogen water, in the words of the people who study it.

Every study cited on this page is published, peer-reviewed, and linked to its original source. We don't summarize selectively. We don't cherry-pick conclusions. If we cite it, you can read it.

This page is for educational purposes only. ionBottles does not diagnose, treat, cure, or prevent disease. Always consult a qualified medical professional before changing your health regimen.

  • 1,300+ Peer-reviewed studiesPubMed-indexed
  • 170+ Conditions studiedFrom inflammation to neurology
  • 19 yrs Of clinical researchSince the 2007
  • ISO/IEC 17025 Our lab certificationSwiss Water Research Institute

The foundational paper

The 2007 Nature Medicine study that started it all.

Cited by over 2,000 subsequent papers, this is the study that established molecular hydrogen as a selective antioxidant — and opened the field that all of the research below now lives in.

Peer-reviewed · PubMed indexed

Nature Medicine · 2007 · Ohsawa, Ishikawa, Takahashi et al.

Hydrogen acts as a therapeutic antioxidant by selectively reducing cytotoxic oxygen radicals.

Researchers at the Nippon Medical School demonstrated that molecular hydrogen (H2) acts as a selective antioxidant — it neutralizes hydroxyl radicals and peroxynitrite, the most cytotoxic reactive oxygen species in the body, without affecting the helpful ones cells need to function.

Until this paper, antioxidants were generally thought to be indiscriminate. This study showed something different: H2 is small enough to cross every membrane in the body, and selective enough to leave normal signaling intact. It opened the door to over a thousand follow-up studies on hydrogen as a therapeutic agent.

The research library

Filter by what matters to you.

Every study below is peer-reviewed and linked directly to its source on PubMed or the publishing journal. We don't paraphrase the conclusions — we let you read the originals.

2023 Peer-reviewed

Hydrogen inhalation therapy in patients with Type 2 diabetes

Improved glucose metabolism and reduced markers of oxidative stress in adults with T2D.

Journal
PMC, NIH
Sample
Human clinical trial
Topic
metabolic
Read full study
2011 Peer-reviewed

Hydrogen-rich water in cancer patients undergoing radiotherapy

Reduced treatment-related oxidative stress in liver cancer patients without affecting radiation efficacy.

Journal
Medical Gas Research
Sample
49 patients, randomized
Topic
oncology,inflammation
Read full study
2012 Peer-reviewed

Molecular hydrogen alleviates chronic inflammation in rheumatoid arthritis

Double-blind trial — H2 significantly reduced inflammatory markers and improved RA symptoms.

Journal
Medical Gas Research
Sample
Double-blind RCT
Topic
inflammation
Read full study
2011 Peer-reviewed

Hydrogen water suppresses weight gain and fat accumulation in obese mice

Modulates gene expression linked to obesity — suppressed body weight gain, fat accumulation, and insulin resistance.

Journal
Obesity
Sample
Animal model
Topic
metabolic
Read full study
2007 Peer-reviewed

Inhaled hydrogen gas reduces brain injury after stroke

Hydrogen inhalation reduced oxidative damage and infarct size in ischemic stroke models — strong neuroprotective signal.

Journal
Nature Medicine
Sample
Animal stroke model
Topic
brain
Read full study
2013 Peer-reviewed

Pilot study of H2 therapy in Parkinson's disease

Drinking hydrogen water for 48 weeks improved Unified Parkinson's Disease Rating Scale scores in early-stage patients.

Journal
Movement Disorders
Sample
18 patients, RCT
Topic
brain
Read full study
2010 Peer-reviewed

H2-rich water improves lipid and glucose metabolism in metabolic syndrome

Open-label trial — reduced LDL cholesterol and improved HDL function in patients with potential metabolic syndrome.

Journal
Journal of Clinical Biochemistry and Nutrition
Sample
20 patients
Topic
metabolic,cardiovascular
Read full study
2012 Peer-reviewed

Hydrogen-rich water decreases muscle fatigue in elite athletes

Pre-exercise hydrogen water buffered blood lactate and reduced perceived exertion in elite male athletes.

Journal
Medical Gas Research
Sample
10 elite athletes
Topic
performance
Read full study
2013 Peer-reviewed

H2 reduces oxidative stress in chronic hepatitis B patients

Drinking hydrogen-rich water reduced ALT, AST, and oxidative stress markers in patients with hepatitis B.

Journal
Hepatology International
Sample
60 patients, RCT
Topic
inflammation
Read full study
2017 Peer-reviewed

Hydrogen treatment improves cognitive function in Alzheimer's models

H2 inhalation improved memory and cognitive performance in animal models of early Alzheimer's by reducing neuroinflammation.

Journal
Neurochemical Research
Sample
Animal model
Topic
brain
Read full study
2008 Peer-reviewed

Cardioprotective effects of H2 in ischemia-reperfusion injury

Hydrogen administration significantly reduced infarct size and protected cardiac tissue after ischemia-reperfusion in rat hearts.

Journal
Biochemical and Biophysical Research Communications
Sample
Animal model
Topic
cardiovascular
Read full study
2019 Peer-reviewed

Hydrogen-rich water mitigates exercise-induced oxidative stress

Two weeks of H2 water intake reduced post-exercise oxidative stress markers and accelerated muscle recovery in trained subjects.

Journal
International Journal of Sports Medicine
Sample
24 trained adults, RCT
Topic
performance,inflammation
Read full study

From the lab

Molecular hydrogen has the potential to be a novel and innovative therapeutic tool. It selectively reduces hydroxyl radicals — the most cytotoxic of the reactive oxygen species — without affecting the body's normal signaling.
Dr. Shigeo Ohta, PhDProfessor, Nippon Medical School · Lead author of the foundational 2007 Nature Medicine paper on molecular hydrogen

How we vet what's on this page

Our standards for what counts as evidence.

We're a hydration company, not a research institution. Here's the bar we hold ourselves to before we cite a study.

  1. 01

    Peer-reviewed only

    If a study isn't published in a peer-reviewed journal and indexed in PubMed (or an equivalent medical database), we don't cite it. No conference abstracts, no preprints presented as findings.

  2. 02

    Linked to original source

    Every study card on this page links directly to PubMed or the publishing journal. Click through. Read the methods section yourself. We won't be offended.

  3. 03

    Honest about study type

    Animal studies are labeled as animal studies. In vitro work is labeled as in vitro. Small pilot trials are labeled as pilot trials. We don't dress up a mouse model as a human result.

  4. 04

    No claims we can't back

    You won't see us say hydrogen water 'cures' anything on this page or any other. The science is genuinely promising in many areas — we let the studies speak for themselves.

Where the science meets your routine

You've read the science. Now drink it.

The studies on this page were the reason we built ionBottles. Our 60-day money-back guarantee exists so you can try the same hydration ritual the research is built on — risk-free — and decide for yourself if your body notices.

See our lab reportTry the ATOM bottle

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