The practical effect: the US has two parallel HBOT markets. Hospital-affiliated medical chambers handle the FDA-approved cases at full medical-grade pressures (2.0–3.0 ATA), with strict protocols and physician oversight. Wellness chambers, mostly mild HBOT (1.3–1.5 ATA in soft-shell or mid-pressure hard chambers), serve the recovery, neuro-rehab and longevity market — typically $150–300 per session, $4,000–8,000 for 40-session protocols.
The research base supports HBOT strongly for the FDA-approved list; the longevity and neuro-rehab claims are more mixed. The Hadanny et al. studies (2020, 2021) on aging biomarkers and post-stroke recovery are the most-cited recent work, but methodological debates continue. Centers that lean heavily on these studies as marketing should be matched with operators that are also transparent about what the literature doesn't yet show.
What to ask before booking: FDA approval status of the chamber, pressure rating, mono- vs multi-place, on-site medical staff, and whether the center handles the FDA-approved indications (a signal of broader operating maturity).
