Hydrogen Breathing Changes Brain Activity and Heart Function
Hydrogen inhalation is associated with a transient rightward shift in prefrontal oxyhemoglobin asymmetry and autonomic modulation
Research hubs: Cognitive Function · Brain & Nervous System · Cardiovascular System
- Evidence type
- Uncontrolled trial (single-arm or pilot) · Human study
- Authors
- Masamichi Moriya, Katsunori Oyama, Yutaka Den, Yukio Yamada, Kaoru Sakatani
- Journal
- Scientific Reports
- Year
- 2026
- PMID
- 41582106
- Study Type
- Human
- Participants
- 15
- Delivery
- Gas
- Dose
- 30-minute session of hydrogen inhalation via nasal cannula at 300 mL/min
- H₂ concentration
- 99.9% hydrogen
- Duration
- 1 day or less
- Funding
- JSPS-KAKENHI grant number 23K25233; CX Wellness Inc.
- Conflicts of interest
- Y.D. is the representative director of CNB Medical Research Institute, which manufactures and distributes hydrogen inhalation devices. Study received support from CX Wellness Inc.
- Outcome
- Positive
- Peer Reviewed
- Yes
- Cited by
- 2 (OpenAlex, as of November 2026)
- Country
- Japan
TL;DR
Hydrogen inhalation temporarily altered brain oxygenation and autonomic nervous system activity, indicating effects on neurovascular and cardiovascular regulation.
Key Finding
Hydrogen inhalation produced temporary increases in right-side brain oxygenation in the prefrontal cortex paired with sympathetic nervous system activation during inhalation, followed by parasympathetic recovery afterward.
Summary
Researchers had healthy adults inhale pure hydrogen gas for 30 minutes and measured changes in brain blood oxygen levels and heart rate patterns. They found that hydrogen inhalation temporarily increased oxygen levels on the right side of the brain's prefrontal cortex (the area involved in decision-making) and caused shifts in the nervous system's activity—first activating the sympathetic nervous system (fight-or-flight response) during inhalation, then activating the parasympathetic nervous system (rest-and-digest response) afterward.
Practical Takeaway
This small study suggests hydrogen gas inhalation may temporarily affect brain oxygenation and nervous system balance in healthy people, but the effects were transient (short-lived) and the study did not measure any actual health outcomes. Much larger and longer studies would be needed to determine whether these changes have any meaningful benefit for cognitive or cardiovascular health.
Abstract (excerpt)
Molecular hydrogen (H2) has selective antioxidant and anti-inflammatory properties, yet its immediate effects on human cerebral oxygenation and autonomic function remain unclear. In this study, we evaluated acute central and autonomic responses to a single 30-minute session of hydrogen inhalation…