Hyperbaric oxygen therapy is a wellness therapy that utilises a combination of high concentrations of oxygen, delivered to you under pressure. You lie down in a pressurised chamber and breathe 96% pure oxygen through a mask, and with every breath, nearly seven times more oxygen dissolves into your blood and plasma than ordinary breathing allows. Every cell and repair mechanism in your body runs on oxygen. A session delivers a large surplus of oxygen, each building on top of the last to create a staircase effect in your body's ability to carry out each cell's specialised function. In other words, your body has more energy to do what it does best - repair, rebuild and grow.
Inside the chamber, pressure rises to 1.5 ATA, roughly what you would feel five metres below the sea surface. That pressure is the working part. At sea level, the haemoglobin in your red blood cells already runs close to fully saturated, so breathing deeper adds almost nothing. Pressure is what lifts that ceiling, increasing actual oxygen uptake as oxygen floods your blood, plasma and cerebrospinal fluid.
Through the mask you breathe around 96% oxygen, against the 21% in ordinary air. Under pressure it dissolves into the blood plasma itself in quantities everyday breathing never reaches, and on into the cerebrospinal fluid and the fluid between your cells. Dissolved oxygen travels where red blood cells struggle to go: into swollen or poorly supplied tissue, exactly the places that usually receive the least.
That surplus feeds the mitochondria that power your cells. Research has measured inflammation settling, circulating stem cells rising and new blood vessels forming: fresh supply lines into tissue that needs them. Nothing is asked of you: 60 minutes at full pressure, lying back, breathing. Those reported effects come from repeated exposure, not one-off visits, which is why we run it as structured protocols.
Different people come for different things. Here is what to expect.





Tap any area below to read the depth: real benefits, what guests notice, and the research behind why HBOT works the way it does.
Faster recovery between hard sessions, soreness gone before you leave the studio, and a pace that holds where it used to fade. Rowers, rugby players, footballers, cyclists, strongmen and triathletes use HBOT here for exactly that. Guests tell us a hard day no longer costs them the next one, and that after many sessions (40+) the same pace feels easier. The research below measured it: higher power output after a single session close to our pressure, and higher maximum oxygen uptake after forty.
Read the full Recovery & Performance guide →The deep ache after a heavy session is the first thing to go, and it goes fast. Most guests walk out with the soreness already gone and legs ready for the next session. Each hour in the chamber saturates working muscle with oxygen, clearing the by-products of hard work and rebuilding muscle faster, with less tightness.
Guests who complete many sessions tell us hard efforts feel easier at the same pace: the fade arrives later in interval sets, matches and long rows. Research has measured maximum oxygen uptake and peak power rising in trained athletes after forty sessions.
Legs still heavy two days after a contact session, the load that stacks up in a big week. Guests carrying high training loads report swelling settling between training days instead of building up. Research has measured blood markers of muscle damage and oxidative stress recovering significantly faster with HBOT than with ordinary rest.
The strain that has hung around for months, the one you train around. Guests report it finally settling and staying settled after many sessions (40+). Tendons and ligaments have a thin blood supply and rebuild slowly. Dissolved oxygen reaches them where red blood cells struggle to, and it needs delivering session after session, not once.
Rugby internationals, Olympic squads, NFL teams and Premier League footballers use HBOT as part of their recovery. Guests here do the same through their busiest weeks. The knocks and heavy weeks stop getting ahead of the recovery, guests tell us, and the fourth heavy week feels like the first.
HBOT is a complementary wellness therapy. Results vary, and we make no medical claims.
Ready-made protocols you can start today: browse them all, back up heavy training with Explosive Strength, or commit to the flagship Established Reset.
Explore every ready-made protocol, grouped by what you're working towards: recovery, performance, wellness and more.
More heavy, high-quality work landing every week: legs that come round overnight, soreness clearing sooner, four weeks dropped into your training cycle.
The complete protocol: the structure the published research keeps returning to.
Most of our guests are not athletes or in the middle of an injury. They are busy people who tell us the same things: the week's aches settle sooner, the head stays clear through demanding days, and after many sessions (40+) an ordinary Tuesday feels better than it used to. A few quiet hours a week, and how you feel day to day improves.
Read the full Everyday Wellness guide →Cold hands and feet warm up, and cuts and scrapes close faster: guests notice both within their first few weeks of sessions. Repeated sessions grow new capillaries, so more blood and more oxygen reach tissue that was running short.
Collagen, cellular repair and tissue turnover all run on oxygen, and they are the processes that decide how the body ages, recovers and rebuilds over the decades. The studies below measured telomeres, repair cells and stamina after long runs of sessions.
Telomere length and the clearing of worn-out cells are the two markers longevity science watches most closely. After sixty sessions the study below measured longer telomeres and fewer senescent cells in healthy adults.
Guests walk out lighter than they walked in, with the week's tension noticeably off them, from the first session. With repeated sessions that becomes the normal state, and for many it is the reason they keep coming.
White blood cells do their work in oxygen. Guests who run a protocol through winter tell us they come through the demanding months steadier.
HBOT is a complementary wellness therapy. Results vary, and we make no medical claims.
Ready-made protocols you can start today: browse them all, ease in with The Opening Build-Up, or commit to the flagship Established Reset.
Explore every ready-made protocol, grouped by what you're working towards: recovery, performance, wellness and more.
Twenty sessions that start at two a week and build to six. Ease in at the start, and finish at full depth.
The complete protocol: the structure the published research keeps returning to.
Guests come to us after an operation or with an injury that has dragged on, and after a run of sessions they report the same things: swelling that settles sooner, a scar line that calms, and follow-up appointments met ahead of where they expected. Recovery is where HBOT has its longest-studied role, and where the change is easiest to see.
Read the full Injury & Recovery guide →A swollen, angry area is the hardest place in the body to feed, because the swelling presses the small vessels shut. Oxygen at pressure dissolves into the plasma and gets in regardless, feeding the repair exactly where it is needed most. Guests report the swelling going down within their first few sessions.
The first four weeks after surgery decide much of the result, and this is where HBOT is at its most impressive. Swelling drops away, bruising clears in days, the wound closes cleanly and the scar line calms as it forms. Guests tell us it was the easiest recovery they have had. We have post-surgery protocols sized to the length of the recovery.
HBOT's anti-inflammatory effect is one of the most extensively measured in the field. Long-standing tension and aching joints are among the most common reasons guests come to us, and after many sessions (40+) most describe the ache gone and the stiffness with it.
Repeated sessions prompt the body to grow fresh capillaries through tissue the circulation normally struggles to reach. It is why the injury you had given up on finishes healing, given enough sessions.
Fibroblasts, the cells that make collagen, do their work in oxygen. Across a protocol HBOT delivers it to the tendons, ligaments and joints that take a beating day to day, and guests feel the difference in how they hold up.
Ask your surgeon about timing before reserving a post-operative protocol.
Ready-made protocols you can start today: browse them all, work through The Bounce-Back, or commit to the flagship Established Reset.
Explore every ready-made protocol, grouped by what you're working towards: recovery, performance, wellness and more.
The core injury protocol for the benched athlete: twenty sessions in a month spent driving a soft-tissue strain from angry to repairing.
The complete protocol: the structure the published research keeps returning to.
Guests who use HBOT around a procedure tell us the same things: the swelling settles sooner, the bruising clears, and the scar line calms and flattens instead of staying red and raised. We have had guests whose aesthetic surgeons recommended HBOT and told them the same thing: do as many sessions as you can, before and after.
Read the full Skin & Aesthetics guide →A new scar is where HBOT shows the most. Guests using it through the weeks a scar is forming describe a scar line that settles flat, pale and calm instead of thick and red. The cells laying down new tissue need oxygen, and repeated sessions keep them supplied. Older scars keep remodelling for years, so they improve too, more slowly.
Sessions in the weeks before an operation build up the circulation in the tissue the surgeon will be working on, so you go in stronger and recover from a better starting point. Even a short run helps: women given one to three sessions in the days before a tummy tuck had complications at 8.4% against 32.6%, and not one raised scar. We have pre-surgery protocols for this.
The first weeks after a procedure decide much of the result, so that is where the sessions go, heaviest in the first week when swelling peaks. Guests report the swollen, bruised stage passing sooner and follow-up appointments met ahead of where they expected. We have post-surgery protocols sized to short and long recoveries.
After many sessions (40+) guests describe skin that looks firmer, brighter and more even in tone. Collagen is built from underneath by cells that cannot make it without oxygen. The skin research below ran sixty sessions with biopsies before and after: collagen density up, elastic fibres more than doubled in length, blood vessels feeding the skin up 39%.
Talk to your aesthetic practitioner about timing before booking a protocol around a procedure.
Ready-made protocols you can start today: browse them all, ease into The Comeback - Light, or commit to the flagship Established Reset.
Explore every ready-made protocol, grouped by what you're working towards: recovery, performance, wellness and more.
The early post-op protocol: 20 sessions over the decisive first weeks, giving repair every advantage.
The complete protocol: the structure the published research keeps returning to.
Bone, cartilage and tendon are among the slowest tissues in the body to come right, because they are fed by the thinnest blood supply. Pressure changes what gets through to them. Guests with a knee or shoulder that never settled tell us that after 40+ sessions the stiff mornings are gone, the joint moves through its full range, and decades-old stiffness has loosened off.
Read the full Aches, Mobility & Joints guide →Osteoblasts, the cells that lay down new bone, multiply and mature in raised oxygen. Guests recovering from a fracture or a bone procedure use HBOT through the weeks that work is happening, and report follow-ups met ahead of where they expected.
Cartilage has no blood supply of its own; it lives on the fluid around it. HBOT raises the oxygen in that fluid, and guests describe joints that move without the grind and the morning stiffness gone.
The tissues that hold everything together take the biggest beating and heal the slowest. Dissolved oxygen reaches them where red blood cells cannot, and guests feel a long-standing strain finally settle.
Guests recovering from joint surgery build HBOT into their rehab: an hour that asks nothing of the joint while oxygen reaches the tissue around it. In the trial below, two sessions at 1.6 ATA brought quadriceps strength back faster with less swelling after knee replacement.
Inflammatory markers fell by a third across sixty sessions in the study below, and kept falling. Guests notice it as puffy joints settling and recent knocks calming within their first few sessions.
Ask your surgeon or physio about timing before adding HBOT to a rehab plan.
Ready-made protocols you can start today: browse them all, ease in with The Loosener, or commit to the flagship Established Reset.
Explore every ready-made protocol, grouped by what you're working towards: recovery, performance, wellness and more.
Twenty sessions at three a week for the tight, desk-bound body: the shoulders, neck and back worked loose again.
The complete protocol: the structure the published research keeps returning to.
Guests notice the head first: thinking that holds through a demanding day, decisions that come quicker, a mind that feels less crowded, often from the first session. No tissue runs on more oxygen than the brain, which takes roughly 20% of the body's supply, so it registers a raised one before anywhere else. Cognition is the change our guests mention most, and the studies below measured it.
Read the full Focus & Clarity guide →Sharper thinking, better concentration and a quieter mind: the change guests describe most often, for many from the very first session, and holding all day with repeated sessions.
Guests describe names, dates and the detail of a conversation coming back more easily. In the trial below, healthy adults on oxygen recalled 11.3 words against 9.0 after deliberate interference: a large, measured gain.
Learning a new skill, adapting to a change, getting back something you had lost: all of it depends on neuroplasticity, and neuroplasticity runs on oxygen. The deeper changes build over many sessions (40+).
Executives, students and founders use HBOT for the edge. Guests describe feeling mentally switched on and able to sustain focus for longer stretches; in the crossover trial below every task improved inside the chamber, thinking and hand skill alike.
An hour at pressure is deeply restful. Guests step out calmer, clearer and emotionally settled, and with repeated sessions that becomes how they feel most of the time.
Talk to your GP before starting a protocol if you have any neurological condition.
Ready-made protocols you can start today: browse them all, clear a foggy afternoon with The Weekday Reset, or commit to the flagship Established Reset.
Explore every ready-made protocol, grouped by what you're working towards: recovery, performance, wellness and more.
A concentrated month aimed at the brain, for the head that fogs by mid-afternoon and wants four clear weeks to think in.
The complete protocol: the structure the published research keeps returning to.
We welcome you in and show you the chamber, with a brief first-visit consent form we ask you to sign. The hour ahead is unbroken, so it is worth a visit to the bathroom first; we have toilets on site. We will answer all of your questions, explain how it all works, and then the session is yours: one hour of relaxing peace.
The soft-shell chamber is spacious and made for stillness, with a mattress and pillow, a blanket if you like, and cool, fresh air throughout, kept comfortable by air conditioning. You lie back and your shoulders drop.
About five gentle minutes to pressurise, then a full hour breathing 96% oxygen at 1.5 ATA, before five minutes to ease back down. The hour at full pressure is the point; the minutes spent pressurising, easing down and settling in are what make the booked slot ninety minutes.
Rise in your own time. Many guests feel it right away: a clearer head, less tension, a lifted mood. It builds, session on session.
A protocol is a planned run of sessions aimed at changes you can feel: fresher legs before and after training, an easier post-op few weeks, and nights that finally go deep. Choose a ready-made one built around your goal, buy a block of sessions to use across the next 12 months, or design your own from scratch.
Not quite the right fit? Build a protocol around your goals: set the length and weekly rhythm, and watch the price update live as you go.
The quickest way in: stacked towards the first week so you feel it fast, with no big commitment.
Keep it simple: buy a block of sessions and use them at your own pace. They are valid for 12 months from the day you buy them.
Every word below is a real, verified Google review left by a Green Oxygen guest, unedited and in their own words.
Darren and Tommy truly made the visit exceptional - their knowledge, care, and genuine enthusiasm for helping clients feel better really stood out. They took the time to explain everything clearly, answered all my questions, and ensured I was comfortable throughout the session.
Genuine Google reviews from people who've had sessions with us at our Marlow studio.
Read them on Google → … or share your own.I felt relaxed, well looked after, and could noticeably feel the benefits afterward - more energy, clearer head, and an overall sense of well being.
Really positive experience and have been several times to use the hyperbaric chamber. Professional and friendly and easy communication with Darren and Tommy.
Head feels so clear and feels like I have more energy. I'll definitely be having more sessions. 👍🏻
I have booked 40 sessions here, that is my confidence in this treatment at Green Oxygen.
I've seen a significant improvement with my lower back pain after only 3 sessions. Very nice, quiet, accessible set up with easy parking. Tommy and his dad are great!
Excellent service, after just one session I felt better … I will be booking more sessions, I can't recommend Green Oxygen Hyperbarics highly enough.
I seemed to have more energy, felt good … a really positive outcome and looking forward to more sessions. Amazing 🤩
An exceptional experience … I also found to be re-energized after my session.
Tommy and Darren have been absolutely wonderful throughout … feeling more rested after a nights sleep and a clearer/sharper mind.
Every corner of this site goes deeper than the page you met it on. Each piece is a few minutes, written plainly. Start anywhere.
The effects
What the surplus does inside you
What happens once the extra oxygen is in your blood: how it reaches tissue that ordinary breathing cannot reach, and what your body does with it over the hours that follow.
Read the story →
The science
Why pressure changes what oxygen can do
Read →
Start here
What is hyperbaric oxygen therapy?
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The protocols
Every protocol, filed by goal
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The builder
Design a protocol of your own
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The history
From diving bells to elite recovery
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The benefits
Six reasons guests step inside
Browse the guides →
The prices
The rate ladder, on one page
See the numbers →
Visiting
Globe Park, mapped and explained
Plan the trip →
Ease in with The Taster: ten sessions, heaviest first, enough to feel the first easy nights and fresher mornings. Or go straight to the flagship Established Reset, the full protocol most people land on.
Browse all protocols →Still unsure? Call us on 07378 271411 and we'll answer anything.
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