What is hyperbaric oxygen and hydrogen therapy?

Hyperbaric oxygen therapy (HBOT) uses a sealed, pressurised chamber to deliver oxygen at higher-than-normal atmospheric pressure. At elevated pressure, oxygen dissolves directly into the blood plasma — independently of red blood cells — and diffuses into tissues throughout the body based on concentration gradients. This allows therapeutic oxygen delivery to areas that normal circulation cannot adequately reach.

Hyperbaric hydrogen therapy adds molecular hydrogen to the breathed gas mixture. Hydrogen is the smallest molecule in existence and the body’s most precise antioxidant — it crosses every biological membrane to neutralise the specific reactive molecules that cause cellular damage, without interfering with normal cellular chemistry. At Aim Health, both gases are delivered together in a single session.

Sessions take place in a hard-shell chamber at pressures between 1.1 and 1.35 ATA — a gentle, well-tolerated pressure range similar to descending slightly in an aircraft. Sessions run from 30 to 90 minutes. The therapy is non-invasive, requires no recovery time, and most clients find it deeply restful.

How does hyperbaric oxygen therapy work?

The physics of oxygen under pressure

Under normal atmospheric conditions, haemoglobin in red blood cells carries virtually all the oxygen in your blood. Very little travels dissolved in the plasma itself. This works well when circulation is healthy — but any tissue where blood flow is reduced due to inflammation, injury, swelling, or chronic illness receives significantly less oxygen than it needs.

Henry’s Law of physics states that the amount of gas dissolved in a liquid increases proportionally with pressure. In a hyperbaric chamber, oxygen dissolves directly into blood plasma at significantly higher concentrations. This plasma-dissolved oxygen diffuses through tissues independently of haemoglobin — reaching inflamed, damaged, and oxygen-starved areas that normal circulation cannot supply.

The downstream effects are substantial. Repair processes stalled for lack of oxygen begin to move. New blood vessels form. Mitochondria — the energy-producing structures inside cells — restore their function. Immune cells work more effectively. Inflammation reduces. Stem cells mobilise from bone marrow to support regeneration.

Why can’t I just breathe more oxygen?

Under normal atmospheric pressure, oxygen is carried almost entirely by haemoglobin inside red blood cells. There is a strict physiological ceiling on how much haemoglobin can carry — it becomes saturated at around 98% under normal conditions. Breathing higher-concentration oxygen at normal atmospheric pressure adds very little additional oxygen to the bloodstream beyond this point.

Inside a hyperbaric chamber, increased pressure bypasses this ceiling entirely. More oxygen dissolves directly into the plasma — independently of haemoglobin — and diffuses into tissues with reduced blood flow, reaching inflamed, damaged, and oxygen-starved areas that haemoglobin-carried oxygen simply cannot access in sufficient quantities.

The role of molecular hydrogen

Hydrogen is added to the breathed gas mixture because it works on the opposite side of the same problem. When the body receives high concentrations of oxygen, it generates reactive molecules as a byproduct. Two of these — the hydroxyl radical and peroxynitrite — are particularly destructive to cells, causing DNA damage, membrane disruption, and protein oxidation.

Hydrogen neutralises these two specific molecules selectively, without interfering with the reactive oxygen species that serve useful biological functions. Oxygen drives the repair; hydrogen protects cells throughout the process. Together they achieve outcomes that neither gas produces alone.

What conditions does hyperbaric oxygen therapy help?

The common thread across the conditions that respond to hyperbaric therapy is tissue hypoxia — oxygen deficiency at the cellular level — combined with chronic or dysregulated inflammation. Hyperbaric oxygen and hydrogen therapy addresses both directly.

Hyperbaric Oxygen Therapy for Long COVID and Post-Viral Fatigue

Many people recovering from COVID or other viral illnesses find that symptoms persist long after the infection has cleared — exhaustion, brain fog, poor sleep, and pain that doesn’t seem to have an obvious cause. This is increasingly understood as a problem with oxygen delivery to the brain and tissues, combined with inflammation the body hasn’t been able to resolve.

Hyperbaric oxygen restores oxygen flow to the parts of the brain and body that have been running short, supporting the cellular repair and energy recovery that persistent fatigue responds to. A clinical trial published in Nature in 2022 found significant improvements in cognitive function, energy, and sleep in long COVID patients following a course of HBOT.

Molecular hydrogen adds to the benefit by crossing the blood-brain barrier and providing anti-inflammatory protection deep within neural tissue — something most treatments cannot reach.

Hyperbaric Oxygen Therapy for Chronic Pain, Fibromyalgia and Endometriosis

Chronic pain and fibromyalgia often have a physical root that is easy to overlook: the tissues involved are running low on oxygen, and the body’s inflammatory response has become stuck in a loop. Hyperbaric therapy addresses both — improving oxygen delivery to painful and inflamed areas and helping the body’s own anti-inflammatory processes work more effectively.

Clinical trials in fibromyalgia patients have shown meaningful reductions in pain and an improvement in how the brain processes pain signals following a course of HBOT. Many people find this provides relief that other approaches haven’t been able to sustain.

Endometriosis is driven by chronic inflammation and low-oxygen environments in the pelvic tissue. Hyperbaric oxygen disrupts these conditions directly, improving oxygenation to the affected areas and reducing the inflammatory signals that drive pain and lesion activity. Molecular hydrogen supports this by reducing inflammation at the cellular level. Many women with endometriosis find that hyperbaric therapy provides relief that other interventions haven’t been able to sustain.

Hyperbaric Oxygen Therapy for Surgery Recovery and Wound Healing

The body heals wounds by growing new tissue, forming new blood vessels, and sending immune cells to the area — all of which require oxygen. After surgery, oxygen delivery to the wound site often drops and healing slows as a result. Hyperbaric therapy restores that oxygen supply, allowing the body’s natural repair process to work at the rate it should.

For cosmetic surgery recovery, HBOT is increasingly popular — clients report less bruising, less swelling, faster healing, and better results. For post-surgical recovery more broadly, it helps people return to normal life sooner.

For slow-healing or complex wounds, HBOT is one of the most effective interventions available and has regulatory approval for this use in multiple countries.

Hyperbaric Oxygen Therapy for Eczema and Skin Health

Eczema, psoriasis, and other inflammatory skin conditions are often treated from the outside in — creams, steroids, topical treatments. But the inflammation driving the flares originates systemically, inside the body. Hyperbaric therapy addresses it at that level, improving oxygen delivery to skin tissue, supporting the skin’s own barrier repair, and reducing the whole-body inflammatory burden that triggers flare cycles.

Molecular hydrogen adds a further layer of protection at the cellular level, neutralising the reactive molecules that cause skin cell damage and barrier disruption from within. Many clients notice improvements in skin condition and a reduction in flare frequency alongside the other benefits of treatment.

Hyperbaric Oxygen Therapy and Neurological Health

The brain uses an enormous amount of oxygen relative to its size, and it is very sensitive to any reduction in supply. Reduced blood flow to parts of the brain is a factor in brain fog, cognitive decline, post-concussion symptoms, and recovery from stroke or traumatic brain injury. Hyperbaric oxygen reaches brain tissue that normal circulation is no longer adequately supplying, supporting repair and helping restore function.

Hydrogen’s ability to cross the blood-brain barrier makes it particularly valuable here, offering anti-inflammatory protection deep inside neural tissue where most treatments cannot reach. Research has shown meaningful improvements following HBOT in patients with traumatic brain injury, stroke, and post-concussion syndrome — often years after the original injury.

Hyperbaric Oxygen Therapy and Healthy Ageing

One of the most exciting areas of hyperbaric research is its effect on how we age biologically. A 2020 study found that a course of HBOT produced significant lengthening of telomeres — the protective caps on DNA that shorten as we age — and a meaningful reduction in senescent cells, the aged cells that accumulate in tissue and drive inflammation. This was the first time any non-pharmaceutical intervention had been shown to reverse both of these ageing markers simultaneously.

For people who want to invest in how well they age — maintaining energy, cognitive sharpness, and physical resilience — hyperbaric oxygen and hydrogen therapy is one of the most evidence-supported tools available.

Hyperbaric Oxygen Therapy and Cancer

Hyperbaric oxygen has an established role supporting people going through cancer treatment. It helps heal the tissue damage caused by radiotherapy, reduces the oxidative side effects of chemotherapy, and supports the body through what is often a physically and emotionally demanding process. This is an approved clinical application in multiple countries.

There is also emerging and promising research into whether oxygen-rich environments are less hospitable to tumour cells, which tend to thrive in low-oxygen conditions. This is an active area of scientific investigation.

Molecular hydrogen supports people through treatment by reducing inflammation and oxidative stress, helping maintain quality of life during a difficult time.

How molecular hydrogen adds to the benefit

Molecular hydrogen is often described simply as an antioxidant — but this understates its significance. What makes hydrogen therapeutically valuable is its selectivity and its access.

What to expect from a session at Aim Health, Hoylake

At Aim Health in Hoylake, our hard-shell AirPod chamber delivers hyperbaric oxygen and molecular hydrogen therapy in a comfortable clinical environment. We regularly welcome clients from across Wirral, Liverpool, Cheshire and North Wales seeking support for recovery, pain management and healthy ageing.

Sessions take place in our hard-shell hyperbaric chamber — a fully pressurised rigid cabin. You are seated comfortably throughout. The door seals and the pressure rises gently over a few minutes to between 1.1 and 1.35 ATA. Most people notice only a very mild sensation in the ears, similar to descending in an aircraft.

Sessions run from 30 to 90 minutes depending on your protocol. Shorter sessions are typically used for recovery and inflammation applications. Longer sessions are used for neurological, post-viral, and longevity protocols. You can read, listen to music, or simply rest. Most clients find it deeply relaxing.

There is no recovery time required — you can return to normal activities immediately after. The effects are cumulative: they build meaningfully across a course of sessions. Your recommended protocol is discussed at your free wellness assessment before any treatment begins.

Frequently asked questions

Hyperbaric oxygen therapy in Hoylake, Wirral

Aim Health is based in Hoylake on the Wirral, offering hyperbaric oxygen and hydrogen therapy alongside whole-body cryotherapy, photobiomodulation, Neurorelaxation and Neurotraining, and compression therapy.

If any of the conditions or applications in this guide resonate — or if you have questions about whether hyperbaric therapy is right for your situation — the first step is a free 30-minute wellness assessment. No obligation. A proper conversation about where you are, what you’ve tried, and what a course of treatment would look like for you specifically.