I would ask all the patients if they noticed anything different about their energy, mentation, skin etc. No one really said they did, but most of these people were in therapy for about 6 to 8 weeks.
The cost is enormous.
You have to have someone monitor you the whole time.
OTOH, Oxygen can be dangerous if you breath it e.g. at night at high doeses.
I really don’t see how this could ever be cost effective and permanent.
A person would have to spend hundreds of thousands of dollars to add a few months of youthful ness to them.
Obviously much more study/testing/research needs to occur, but
given derived o2 levels and amount of time required under therapy, with MD/NP prescribed supervision, an o2 concentrator along with CPAP device might be able to replace the expensive HBO sessions for those with lesser means. Such an arrangement may even prove better/safer. And, FWIW, seems to me to be worth looking into.