the hbot center only takes you to 2.4. They say medical literature doesn't provide enough info to say that going further gives any more benefits so they don't. The chambers are run by foreign trained doctors. I had contacted a few other places that were cheaper but they were personally owned chambers by individuals such as physio's and chiropractors with no training. They were about half the cost. I just feel better about going into the one with doctors.

They told me of only a couple risks

1. Changes to eyesight. however, they said this normally lasts only a few hours before returning to normal.

2. Eardrum pressure or damage. They said the patient has to take a few days off therapy and the issue resolves

3. Increased risk of seizure if you have seizures. If you experience seizures they don't take you above 1.5 ( I think he said 1.5) and they give you a mask to breathe into for a few minutes every 30min. I don't remember what they run through the mask. I don't experience seizures so wasn't paying close attention I guess.

If anybody has tried hbot and experienced any of these (or other side effects) I would appreciate hearing about them and if they resolved. thanks