Evidence, Honestly
HBOT Research: What the Evidence Says Beyond the Cleared List
Nothing in this section is an FDA-cleared indication for hyperbaric oxygen therapy, and Generations Wellness does not market HBOT for any of these conditions. People ask us about them, so we summarize the published research honestly: study sizes, controls, results and limits.
Hyperbaric oxygen therapy is FDA-cleared for a specific list of conditions, and some clinics market it for a much longer one. This section separates the two. None of the topics covered here is an FDA-cleared indication, and Generations Wellness does not market or provide HBOT for them. Each research page summarizes the published studies on a condition people often ask us about: long COVID, brain injury, stroke, surgical recovery, athletic recovery and aging. We include the study sizes, whether there was a sham group, and what the results did and did not show. We think you deserve the evidence, even when the honest answer is "we don't know yet."
Definitions
Cleared, Investigational, or Marketed: Three Very Different Words
FDA-cleared
The FDA clears hyperbaric chambers as medical devices for specific uses. Those uses include air or gas embolism, carbon monoxide poisoning, decompression sickness, crush injuries, certain non-healing diabetic wounds, delayed radiation injury, compromised skin grafts and flaps, and sudden hearing loss, among others. "Cleared" is tied to the indication, not to HBOT in general. That is why describing HBOT as a blanket "approved" treatment is misleading. You can see the full list on our page about the FDA-cleared conditions list.
Investigational
An investigational use is one that researchers are studying in trials. Some of those trials report encouraging results. But the use is not cleared by the FDA and is not on the Undersea and Hyperbaric Medical Society (UHMS) list of recognized indications. "Being studied" is not the same as "shown to work."
Marketed
Some clinics sell HBOT for conditions regardless of the evidence. The FDA has warned about this directly. Its consumer update says hyperbaric chambers have not been cleared for, among others:
- Cancer, autism, Lyme disease and Alzheimer's disease
- Stroke, brain injury, cerebral palsy, multiple sclerosis and Parkinson's disease
- Depression and migraine
- Heart disease, asthma and HIV/AIDS
- Sports injuries and COVID-19
The FDA also recommends that anyone considering HBOT receive it under a doctor's care at an accredited facility.
A 90-Second Guide
How to Read an HBOT Study
You don't need a medical degree to judge a headline about hyperbaric oxygen. Ask these five questions about any study you read, including the ones on our research pages.
- Was there a sham or control group? A sham group sits in a chamber that feels similar but delivers little or no extra pressure or oxygen. Without one, you can't tell whether HBOT caused the change or whether time, attention and expectation did.
- How many people took part? Trials of 25 to 80 people can hint at an effect. They rarely settle a question on their own.
- What pressure was used? "Mild" chambers run around 1.3 ATA (atmospheres absolute). Medical studies usually use 1.5 to 2.4 ATA. A result at one pressure tells you little about another.
- What was measured? A change in a lab marker or a brain scan is not the same as feeling better, working again, or living longer.
- Has it been repeated? A finding from one research center needs confirming at others before anyone can rely on it.
One lesson from the brain-injury research is worth knowing. In several military trials, people improved in both the HBOT group and the sham group, by similar amounts. "Participants improved" is not the same as "HBOT worked." The TBI and concussion research page explains that debate in detail.
Deep Dives
The Research Pages
Each page has a full studies table, a section on what the research does not show, and sources. Here is the one-line status for each.
- HBOT for long COVID. One positive sham-controlled trial of 73 people (40 sessions) and one 80-person trial (10 sessions) that found no difference from placebo. Not cleared.
- HBOT for TBI and concussion. Sham-controlled military trials found little or no lasting HBOT-versus-sham difference; smaller trials without a sham group reported gains. Not cleared.
- HBOT for stroke recovery. No benefit shown in acute stroke (Cochrane review of 11 trials); one chronic-stroke crossover trial without a sham reported gains; stroke guidelines do not recommend it. Not cleared.
- HBOT after surgery. Cleared only for compromised grafts, flaps and certain non-healing wounds. Evidence for routine elective recovery is small and low quality.
- HBOT for athletes. Mixed. A Cochrane review found no benefit for soreness or sprains; newer small trials report faster recovery of lab markers. The FDA lists sports injuries as not cleared.
- HBOT and anti-aging. Single-center studies of blood markers and thinking skills in healthy older adults; no sham group and no clinical-outcome data. Not cleared.
Not Cleared
Conditions People Ask About That HBOT Is Not Cleared For
These are the conditions people most often ask about that fall outside the FDA-cleared list. Naming them here is not a suggestion that HBOT helps. It is the opposite: a plain statement of where the evidence stands.
| Condition | Evidence status | Our position |
|---|---|---|
| Autism | Small trials. A 2010 sham-controlled trial found no difference from sham. Named by the FDA as not cleared. | Not offered |
| Cancer | HBOT is not a cancer treatment. It is used for radiation injury after cancer treatment, which is cleared. | Not offered for cancer |
| Lyme disease | Named by the FDA as a promoted use that is not cleared. | Not offered |
| Multiple sclerosis | A Cochrane review found no consistent benefit. | Not offered |
| Alzheimer's disease and dementia | Named by the FDA as a promoted use that is not cleared. | Not offered |
| Parkinson's disease, cerebral palsy | Named by the FDA as not cleared. | Not offered |
| PTSD | A VA evidence review found no short-term benefit over sham. Not VA standard care. | Not offered |
| Depression, migraine | Named by the FDA as not cleared. | Not offered |
| Heart disease, asthma, HIV/AIDS | Named by the FDA as not cleared. | Not offered |
| Diabetes itself | Not cleared. Certain diabetic foot ulcers are a separate, cleared indication. | Foot ulcers assessed by a physician |
| Stroke, brain injury, COVID-19, sports injuries | Named by the FDA as not cleared. See the research pages above. | Not offered |
Two rows deserve a note. For cancer survivors, HBOT is used for radiation tissue injury in cancer survivors, which is a cleared indication, but it is not used to treat the cancer. For people with diabetes, HBOT is used for diabetic foot ulcers, which are a cleared indication, when strict criteria are met, but not for diabetes itself.
In Practice
What We Do When Someone Asks About One of These
You can ask us about any condition on this page, and you'll get a real conversation with Dr. Rajwinder Singh Bahia, MD's physician-directed team. We give you an honest summary of the evidence, including what the studies did not measure. We do not sell a course of HBOT for a condition outside the cleared list, and we make no promises about outcomes. If you also have a cleared indication, such as a wound that won't heal, the physician assesses that on its own merits, and HBOT is offered only when a physician determines it is appropriate. Read how we decide who is a candidate, or talk to our physician.
Candor as Policy
Why We Publish This at All
It would be easier to stay quiet about conditions we don't offer HBOT for. But people search for these answers, and many of the pages they find are selling something. We would rather be the place that tells you plainly what the studies found, what they didn't, and where the evidence runs out. Every research page follows our clinical standards and our editorial policy: named studies, stated limitations, and no outcome promises.
Important
These pages are educational. Generations Wellness does not market or provide HBOT as a treatment for conditions outside the FDA-cleared list. A physician assessment is required before beginning HBOT for any indication.
Questions
HBOT Research: Frequently Asked Questions
Is HBOT FDA approved?
Hyperbaric chambers are FDA-cleared devices for specific indications, such as carbon monoxide poisoning, certain diabetic foot ulcers and delayed radiation injury. HBOT is not cleared as a general therapy, and it is not cleared for the conditions in this section.
What conditions is HBOT not approved for?
Any condition outside the FDA-cleared and UHMS-recognized list, including autism, cancer, Lyme disease, multiple sclerosis, Alzheimer's, stroke, brain injury, long COVID and anti-aging, regardless of how it is marketed elsewhere.
Are there other conditions that may benefit from HBOT?
Some are being studied, with mixed results. "Being studied" is not the same as "shown to work," and none of them is a cleared indication.
Does hyperbaric oxygen feed cancer?
A 2012 review in Targeted Oncology (Moen and Stuhr) found no evidence that HBOT stimulates tumor growth or increases recurrence. HBOT is used in cancer survivors for delayed radiation tissue injury, a cleared indication, but it is not a cancer treatment, and your physician reviews your cancer history before any course.
Does the VA cover HBOT for PTSD or TBI?
Not as standard care. A VA evidence review found no short-term benefit over sham. Some veterans have accessed HBOT through pilot or state-funded programs or clinical trials.
Sources
- U.S. Food and Drug Administration. Hyperbaric Oxygen Therapy: Get the Facts. fda.gov
- Undersea and Hyperbaric Medical Society. Hyperbaric Oxygen Therapy Indications. uhms.org
- Zilberman-Itskovich S, et al. Hyperbaric oxygen therapy improves neurocognitive functions and symptoms of post-COVID condition: randomized controlled trial. Scientific Reports, 2022. nature.com
- Kjellberg A, et al. HOT-LoCO phase II randomized trial, 2025. pmc.ncbi.nlm.nih.gov
- VA Evidence Synthesis Program. Evidence Brief: Hyperbaric Oxygen Therapy for Traumatic Brain Injury and/or Post-traumatic Stress Disorder, 2021. ncbi.nlm.nih.gov
- Bennett MH, et al. Hyperbaric oxygen therapy for acute ischaemic stroke. Cochrane Database of Systematic Reviews, 2014. cochranelibrary.com
- Bennett M, et al. Hyperbaric oxygen therapy for delayed onset muscle soreness and closed soft tissue injury. Cochrane Database of Systematic Reviews, 2005. cochranelibrary.com
- Hachmo Y, et al. Hyperbaric oxygen therapy increases telomere length and decreases immunosenescence in isolated blood cells: a prospective trial. Aging, 2020. aging-us.com
- Bennett M, Heard R. Hyperbaric oxygen therapy for multiple sclerosis. Cochrane Database of Systematic Reviews. cochranelibrary.com
- Granpeesheh D, et al. Randomized trial of hyperbaric oxygen therapy for children with autism. Research in Autism Spectrum Disorders, 2010. doi.org
This page is educational and not medical advice. The conditions discussed here are not FDA-cleared indications for HBOT, and Generations Wellness does not market HBOT for them. A physician assessment is required before HBOT. See our full medical disclaimer.
In This Section
Research Topics
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HBOT and Anti-Aging: The Studies
Not an FDA-cleared use. The telomere, cognition and skin studies in healthy older adults explained: sizes, controls, surrogate markers, and limits.
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HBOT for Athletes: The Research
Not an FDA-cleared use. Why athletes use chambers, what Cochrane and newer trials found for soreness, sprains and muscle injury, and the limits.
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HBOT for Long COVID: The Research
Not an FDA-cleared use. Two randomized trials point in different directions. Study sizes, sessions, sham controls and results, explained with sources.
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HBOT After Surgery: Cleared vs. Not Cleared
HBOT is cleared for compromised grafts and flaps; some problem wounds may qualify. Routine cosmetic or joint-surgery recovery is not cleared.
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HBOT for Stroke Recovery: The Evidence
Not an FDA-cleared use. Cochrane found no benefit in acute stroke; one chronic-stroke trial without sham reported gains. Guidelines, studies, limits.
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HBOT for TBI and Concussion: The Evidence
Not an FDA-cleared use. Military sham-controlled trials found no HBOT-vs-sham difference; trials without sham reported gains. The studies, explained.
Your Next Step
Talk to a Physician About Your Situation
We'll give you an honest answer about whether HBOT is appropriate for you, including when it isn't.
Prefer to talk? (369) 222-0979