It is valuable for treating many problems such as carbon monoxide poisoning and certain types of wound care, but it can also be dangerous to your lungs especially. I am highly skeptical about its use for treating psychological conditions and aging.
Under controlled clinical conditions, HBOT is as safe as any medical procedure.
As a veteran, I’m for looking into many non-traditional methods for treating PTSD and TBI in the many veterans and first responders who are suffering with these injuries. More clinical testing needs to be done and off-label trials should be conducted also. Whatever works.