This article is part of the HBOT Radar series, where we summarize the latest published hyperbaric oxygen therapy research.
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Disclaimer: This article is intended for educational and informational purposes only. It summarizes published medical research conducted in clinical settings and does not evaluate Brain Spa Hyperbaric products. The hyperbaric chambers offered on this website are non-medical wellness devices and are not intended to diagnose, treat, cure, or prevent any disease. Do not make medical decisions based on this article — consult a qualified healthcare professional.
📌 Could Pressurized Oxygen Make Your Hair Grow? A Pilot Study Put It to the Test
🔍 What this study explored
Until recently, most research on HBOT and hair focused on one specific scenario: helping transplanted hair grafts survive after surgery. But a team from South Korea asked a much more intriguing question — what if pressurized oxygen could affect hair follicles on its own, without any surgery involved?
Think about what HBOT does at a tissue level: it floods your body with oxygen, stimulates new blood vessel growth, and activates growth factors like VEGF and PDGF that are known to play a role in hair follicle health. Hair follicles are among the most metabolically active structures in the human body — they cycle through growth, rest, and regeneration phases that depend heavily on oxygen and nutrient supply from surrounding blood vessels.
The biological logic is surprisingly straightforward: if you can improve the oxygen and blood flow environment around hair follicles, you might be able to influence how they grow.
But until this study, nobody had actually tested it on healthy people who weren't losing their hair and weren't having surgery. This is the first study to ask: does HBOT alone — without any other intervention — produce measurable changes in hair follicle characteristics in otherwise healthy adults?
🌬️ HBOT protocol used in this study
This was a substantial commitment for the participants:
- Pressure: 2.0 ATA with 100% oxygen
- Session duration: 90 minutes
- Total sessions: 50 sessions over three months
- Frequency: Roughly 4-5 sessions per week
- Chamber: Medical-grade monoplace chamber (IBEX LIGHT)
- Protocol: Modified US Navy Treatment Table #9 with gradual 15-minute pressure ramp-up and ramp-down
Nine healthy adult volunteers completed the full protocol. No medications, no topical treatments, no hair procedures — just HBOT and their normal routine.
Important: This study used clinical-grade HBOT at 2.0 ATA with 100% medical oxygen. These conditions are not comparable to consumer or wellness-grade chambers.
📊 Key findings
The numbers: trending up, but not yet statistically conclusive
The researchers measured four key hair parameters using a phototrichogram system (basically a high-tech scalp camera with AI-powered analysis) before and after the 50 sessions:
Follicle density went from 61.3 to 66.8 follicles per cm² — an 8.9% increase. That's a meaningful trend, but it didn't reach statistical significance (p = 0.173).
Hairs per follicle increased from 1.24 to 1.33 — suggesting follicles were producing more individual hairs. Also not statistically significant (p = 0.071), but tantalisingly close.
Hair volume rose from 24.9% to 27.7% — an 11% increase. Again, trending positive but not significant (p = 0.515).
So why wasn't anything statistically significant? Two words: nine people. With a sample this small, you'd need enormous effect sizes to clear the significance threshold. The trends are consistent and all pointing in the same direction — which is exactly what a pilot study is supposed to show.
One measurement that WAS significant — and it's counterintuitive
Here's the one that might confuse you at first: hair shaft thickness actually decreased — from 0.18 mm to 0.10 mm — and this was statistically significant (p = 0.011).
Thinner hair sounds like a bad thing, right? But the researchers have a compelling explanation: this is actually consistent with new hair growth. When dormant follicles reactivate and enter the anagen (growth) phase, the new hairs that emerge are initially thin — they haven't had time to fully mature yet. If HBOT is waking up resting follicles, you'd expect to see exactly this: more follicles, more hairs per follicle, but initially thinner shafts.
It's a signature of hair regeneration, not hair loss. A longer follow-up would be needed to see whether those thin new hairs eventually thicken up.
What the participants said: significant across the board
The subjective assessments told a more dramatic story. Using a 7-point scale, participants rated improvements in five categories — and every single one was statistically significant (p < 0.05):
- Scalp appearance
- Perceived hair density
- Hair thickness perception
- Hair growth rate
- Reduced shedding
Subjective reports always deserve a degree of skepticism (people who sit through 50 HBOT sessions over three months have a strong motivation to believe it's working). But the alignment between the objective trends and subjective reports is worth noting — they're telling the same story from different angles.
🧠 Why this study matters
This is genuinely new territory. Previous HBOT-and-hair research always involved surgical patients — hair transplants where HBOT was added as an adjunct. This is the first study to isolate the effect of HBOT alone on hair follicles in healthy people.
The results don't prove that HBOT grows hair. Let's be clear about that. But they do something important: they establish that the question is worth asking more seriously.
What makes the findings biologically plausible:
- HBOT is known to upregulate VEGF, which promotes blood vessel growth around follicles
- Oxygen-enriched environments have been shown to influence the hair growth cycle in animal models
- The pattern observed — more follicles, more hairs per follicle, initially thinner shafts — is consistent with early anagen-phase activation
What makes the findings preliminary:
- Nine participants. This is tiny. One or two unusual responders could skew everything.
- No control group. There's no way to know what would have happened to these people's hair over three months without HBOT. Seasonal variations, placebo effects, and natural hair cycle fluctuations are all confounders.
- Three months may not be long enough. A full hair growth cycle takes 2-6 years. Three months captures early activation signals at best.
- The subjective improvements might reflect expectation bias. Participants knew they were receiving HBOT and were looking for changes.
The researchers themselves are admirably honest about all of this — their conclusion explicitly calls for "further controlled studies" and frames this as "preliminary findings" that "justify" more rigorous research.
📌 Takeaway for the community
- In the first study to test HBOT's effect on hair follicles without surgery, 9 healthy adults who completed 50 HBOT sessions over 3 months showed positive trends in follicle density (+8.9%), hairs per follicle, and hair volume — though none reached statistical significance
- Hair shaft thickness decreased significantly, which the researchers interpret as a sign of new early-phase hair growth from reactivated follicles
- All five subjective measures — scalp appearance, density, thickness, growth, and shedding — showed statistically significant improvement as rated by participants
- With only 9 participants and no control group, these results are best understood as "the signal is there, but we need a proper trial to know for sure"
- This study used clinical-grade HBOT at 2.0 ATA with 100% medical oxygen over 50 sessions — not comparable to consumer wellness chambers
Source: https://www.mdpi.com/2306-5354/13/2/240
Lee HY, Lee JY, Kim SC, Lee Y. Preliminary Effects of Hyperbaric Oxygen Therapy on Hair Follicle Characteristics in Healthy Subjects. Bioengineering. 2026;13(2):240. doi: 10.3390/bioengineering13020240.
Educational disclaimer
This content summarizes findings from published medical research for educational purposes only.
The hyperbaric chambers sold on this website are non-medical wellness devices and are not intended to diagnose, treat, cure, or prevent any disease.
The studies discussed here were conducted in clinical medical settings using medical-grade interventions. The inclusion of research summaries does not imply that similar outcomes can be achieved using non-medical wellness devices.
