Human clinical studies of hydrogen inhalation (randomized trials, observational studies, case reports). Delivery is restricted to inhalation; consult the safety notes separately.
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Sixty-minute inhalation of molecular hydrogen decreases blood oxygen saturation but does not alter autonomic cardiac regulation at rest in healthy females: a randomized, double-blind, placebo-controlled crossover study.
Can J Physiol Pharmacol ・ 2026 ・ PMID 41401441
inhalation
mixed
human randomized controlled trial
-
Hydrogen inhalation is associated with a transient rightward shift in prefrontal oxyhemoglobin asymmetry and autonomic modulation.
Sci Rep ・ 2026 ・ PMID 41582106
inhalation
positive
human observational study
-
[The combined use of inhaled nitric oxide and molecular hydrogen in patients with post-COVID-19 syndrome].
Ter Arkh ・ 2026 ・ PMID 41859790
inhalation
positive
human randomized controlled trial
-
Molecular hydrogen inhalation modulates resting metabolism in healthy females: findings from a randomized, double-blind, placebo-controlled crossover study.
Med Gas Res ・ 2025 ・ PMID 39923133
inhalation
positive
human randomized controlled trial
-
Hydrogen-oxygen mixture inhalation as an adjunctive treatment to home-based exercise in older patients with knee osteoarthritis: an open-label, blinded-endpoint, randomized controlled trial.
Front Pharmacol ・ 2025 ・ PMID 39950118
inhalation
mixed
human randomized controlled trial
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[Efficiency and safety of the integrated use of medical gases thermal heliox, nitric oxide and molecular hydrogen in patients with exacerbation of chronic obstructive pulmonary disease complicated by hypoxemic, hypercapnic respiratory failure and secondary pulmonary arterial hypertension in the post-COVID period].
Ter Arkh ・ 2025 ・ PMID 40327618
inhalation
positive
human randomized controlled trial
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Clinical Efficacy of Hydrogen Therapy on Acute Radiation Enteritis and Inflammatory Response in Patients with Cervical Cancer Undergoing Concurrent Chemoradiation Therapy.
Adv Radiat Oncol ・ 2025 ・ PMID 41020280
inhalation
positive
human randomized controlled trial
-
Molecular Hydrogen as a Promising Therapy Could Be Linked With Increased Resting Treg Cells or Decreased Fas+ T Cell Subsets in a IgG4-PF-ILD Patient: A Case Report.
In Vivo ・ 2024 ・ PMID 38688598
inhalation
positive
human case report
-
[Rehabilitation program of post-COVID-19 syndrome with the use of nitric oxide and molecular hydrogen].
Ter Arkh ・ 2024 ・ PMID 38713041
inhalation
positive
human randomized controlled trial
-
The impact of hydrogen inhalation therapy on blood reactive oxygen species levels: A randomized controlled study.
Free Radic Biol Med ・ 2024 ・ PMID 38996821
inhalation
positive
human randomized controlled trial
-
Hinhalation therapy in patients with moderate COVID-19 (HCOVID): a prospective ascending-dose phase I clinical trial.
Antimicrob Agents Chemother ・ 2024 ・ PMID 39016593
inhalation
positive
human case report
-
Realizing brain therapy with "smart medicine": mechanism and case report of molecular hydrogen inhalation for Parkinson's disease.
Med Gas Res ・ 2024 ・ PMID 39073335
inhalation
positive
human case report
-
Combination of Hydrogen Inhalation and Hypothermic Temperature Control After Out-of-Hospital Cardiac Arrest: A Post hoc Analysis of the Efficacy of Inhaled Hydrogen on Neurologic Outcome Following Brain Ischemia During PostCardiac Arrest Care II Trial.
Crit Care Med ・ 2024 ・ PMID 39133068
inhalation
mixed
human randomized controlled trial
-
A case of lung injury due to a hydrogen explosion caused by the simultaneous use of two home folk remedies devices.
Acute Med Surg ・ 2024 ・ PMID 39634382
inhalation
adverse
human case report
-
Molecular hydrogen exposure improves functional state of red blood cells in the early postoperative period: a randomized clinical study.
Med Gas Res ・ 2023 ・ PMID 36204784
inhalation
positive
human randomized controlled trial
-
Efficacy of inhaled hydrogen on neurological outcome following brain ischaemia during post-cardiac arrest care (HYBRID II): a multi-centre, randomised, double-blind, placebo-controlled trial.
EClinicalMedicine ・ 2023 ・ PMID 36969346
inhalation
mixed
human randomized controlled trial
-
Effects of Hydrogen Gas Inhalation on Community-Dwelling Adults of Various Ages: A Single-Arm, Open-Label, Prospective Clinical Trial.
Antioxidants (Basel) ・ 2023 ・ PMID 37371971
inhalation
positive
human observational study
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The efficacy of hydrogen/oxygen therapy favored the recovery of omicron SARS-CoV-2 variant infection: results of a multicenter, randomized, controlled trial.
J Clin Biochem Nutr ・ 2023 ・ PMID 37970554
inhalation
positive
human randomized controlled trial
-
Molecular Hydrogen Positively Affects Physical and Respiratory Function in Acute Post-COVID-19 Patients: A New Perspective in Rehabilitation.
Int J Environ Res Public Health ・ 2022 ・ PMID 35206179
inhalation
positive
human randomized controlled trial
-
Hydrogen Gas Inhalation Regressed Coronary Artery Aneurysm in Kawasaki Disease-Case Report and Article Review.
Front Cardiovasc Med ・ 2022 ・ PMID 35647081
inhalation
positive
human case report
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Dynamics of Metabolic and Oxidative Parameters of Erythrocytes during Treatment of Chronic Heart Failure with Molecular Hydrogen.
Bull Exp Biol Med ・ 2022 ・ PMID 36210415
inhalation
positive
human observational study
-
Protective effects of hydrogen gas inhalation on radiation-induced bone marrow damage in cancer patients: a retrospective observational study.
Med Gas Res ・ 2021 ・ PMID 33942780
inhalation
positive
human observational study
-
Randomized double-blind placebo-controlled trial of hydrogen inhalation for Parkinson's disease: a pilot study.
Neurol Sci ・ 2021 ・ PMID 34319514
inhalation
null
human randomized controlled trial
-
Application of Molecular Hydrogen in Heart Surgery under Cardiopulmonary Bypass.
Sovrem Tekhnologii Med ・ 2021 ・ PMID 34513069
inhalation
positive
human observational study
-
Effect of hydrogen gas inhalation on patient QOL after hepatectomy: protocol for a randomized controlled trial.
Trials ・ 2021 ・ PMID 34674744
inhalation
not assessed
human randomized controlled trial
-
Inhalation of molecular hydrogen increases breath acetone excretion during submaximal exercise: a randomized, single-blinded, placebo-controlled study.
Med Gas Res ・ 2020 ・ PMID 33004705
inhalation
positive
human randomized controlled trial
-
Hydrogen gas inhalation alleviates oxidative stress in patients with post-cardiac arrest syndrome.
J Clin Biochem Nutr ・ 2020 ・ PMID 33041520
inhalation
mixed
human case report
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Impact of hydrogen-rich gas mixture inhalation through nasal cannula during post-exercise recovery period on subsequent oxidative stress, muscle damage, and exercise performances in men.
Med Gas Res ・ 2020 ・ PMID 33380581
inhalation
mixed
human randomized controlled trial
-
Inhalation of hydrogen gas elevates urinary 8-hydroxy-2'-deoxyguanine in Parkinson's disease.
Med Gas Res ・ 2018 ・ PMID 30713666
inhalation
null
human randomized controlled trial
-
The Effects of Hydrogen Gas Inhalation on Adverse Left Ventricular Remodeling After Percutaneous Coronary Intervention for ST-Elevated Myocardial Infarction - First Pilot Study in Humans.
Circ J ・ 2017 ・ PMID 28321000
inhalation
mixed
human observational study
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Hydrogen Gas Inhalation Treatment in Acute Cerebral Infarction: A Randomized Controlled Clinical Study on Safety and Neuroprotection.
J Stroke Cerebrovasc Dis ・ 2017 ・ PMID 28669654
inhalation
positive
human randomized controlled trial
-
Efficacy of inhaled HYdrogen on neurological outcome following BRain Ischemia During post-cardiac arrest care (HYBRID II trial): study protocol for a randomized controlled trial.
Trials ・ 2017 ・ PMID 29058596
inhalation
not assessed
human randomized controlled trial
-
Molecular hydrogen consumption in the human body during the inhalation of hydrogen gas.
Adv Exp Med Biol ・ 2013 ・ PMID 23852510
inhalation
not assessed
human observational study
-
A basic study on molecular hydrogen (H2) inhalation in acute cerebral ischemia patients for safety check with physiological parameters and measurement of blood H2 level.
Med Gas Res ・ 2012 ・ PMID 22916706
inhalation
positive
human case report
-
[Temporary clipping and cerebral blood flow in patients with cerebral aneurysms].
Zh Vopr Neirokhir Im N N Burdenko ・ 2006 ・ PMID 17125074
inhalation
not assessed
human observational study