Oxygen Therapy Infoblog: The extra oxygen helped to regrow blood vessels and nerve fibers

 "Once the extra oxygen diffuses into damaged areas, it supplies energy and the regenerative process can happen." The extra oxygen helped to regrow blood vessels and nerve fibers."

Article: Breathing Pure Oxygen Could Repair Brain Damage Years After a Concussion
https://futurism.com/neoscope/breathing-pure-oxygen-repair-brain-damage-years-after-concussion