HOCATT therapy is a multi-technology wellness treatment delivered inside a single-person steam sauna pod. The name stands for “Hyperthermic Ozone and Carbonic Acid Transdermal Technology,” and the system combines ten different modalities into one 25- to 40-minute session. You sit inside the chamber with your head outside it, breathing concentrated oxygen while the pod delivers ozone, steam, carbon dioxide, infrared heat, and several other therapies through your skin simultaneously.
The Ten Technologies Inside the Pod
The HOCATT system layers the following modalities during each session:
- Transdermal ozone: Activated oxygen (O₃) delivered through steam for full-body skin exposure.
- Carbonic acid (CO₂): Carbon dioxide introduced into the chamber reacts with ozone and steam to form carbonic acid, intended to open pores and improve ozone absorption.
- Steam sauna: Raises core body temperature to promote sweating.
- Far infrared: Infrared wavelengths that penetrate roughly 1.5 inches below the skin surface for deeper heat.
- High-intensity PEMF: Pulsed electromagnetic fields aimed at supporting cellular energy.
- Frequency-specific microcurrents: Gentle electrical stimulation at targeted frequencies.
- Concentrated oxygen breathing: Delivered through a nasal cannula while you sit with your head outside the pod.
- Essential oil infusions: Aromatic compounds carried through the steam.
- Photon light and color therapy: Full-spectrum and specific color wavelengths inside the chamber.
- Ultraviolet irradiation: Produced naturally as ozone breaks down during the session.
Not every clinic activates all ten at once. Practitioners typically adjust which modalities run and in what sequence based on what you’re there for.
How Ozone Works Through the Skin
The core technology is transdermal ozone. When ozone dissolves into the moisture on your skin, it reacts within one to two minutes, producing reactive oxygen species like hydrogen peroxide and lipid oxidation products. These molecules act as signaling agents. They activate two major cellular pathways: one that governs your body’s antioxidant defenses and another that regulates inflammation. The net effect, according to research published through the National Institutes of Health, is a shift in the body’s internal redox balance, essentially nudging cells toward better management of oxidative stress and inflammatory responses.
Ozone also appears to influence gene expression related to tissue oxygenation, stimulating growth factors that can improve blood flow to oxygen-starved areas. This is a key reason proponents use it for chronic conditions involving poor circulation or slow healing.
How Carbonic Acid Boosts Oxygen Delivery
The CO₂ phase typically runs at the beginning of the session, before the ozone is introduced. When carbon dioxide contacts the moist skin and enters the body, it forms carbonic acid, which lowers pH slightly. This triggers a well-established physiological response called the Bohr effect.
Here’s how it works: when the blood around your tissues becomes slightly more acidic, hemoglobin changes shape and releases oxygen more readily. Under normal conditions, hemoglobin holds onto a portion of its oxygen as it passes through your capillaries. But in an acidic environment, it “unloads” more of that oxygen into surrounding tissues. The result is that your cells receive more oxygen from the same amount of blood flow. This is not unique to HOCATT; the Bohr effect is standard human physiology. The therapy simply creates conditions that amplify it.
By running the CO₂ phase first, the treatment also dilates blood vessels near the skin surface. This is thought to make the skin more permeable to the ozone that follows, allowing deeper and more even absorption.
The Heat and Detoxification Component
The steam sauna and far infrared elements work together to raise your core body temperature, inducing a state called mild hyperthermia. This serves two purposes. First, sweating is one of the body’s natural routes for eliminating heavy metals, environmental toxins, and metabolic waste products. Second, the elevated temperature activates the lymphatic system, which is responsible for filtering and transporting waste out of tissues.
Far infrared heat penetrates deeper than conventional steam alone, reaching about 1.5 inches below the skin. This means it warms muscle tissue and joints directly rather than just heating the air around you. Many people find this produces a more comfortable, less suffocating heat than a traditional steam room.
What a Session Feels Like
You undress and sit inside the pod, which closes around your body while your head stays outside in the open air. A nasal cannula delivers concentrated oxygen for you to breathe throughout the session. The pod gradually fills with steam and, depending on the protocol, you may notice a slight tingling sensation from the microcurrents or a warm, flushed feeling as the CO₂ phase dilates your blood vessels.
First-time users generally start with 20 to 25 minutes. As your body adjusts over subsequent visits, sessions typically extend to 30 to 40 minutes. Most wellness clinics recommend one to two sessions per week for general health maintenance, with more frequent sessions (sometimes three per week) during an initial period for people addressing specific concerns. The experience is generally relaxing. Most people describe it as similar to sitting in a warm bath, with a mild energized feeling afterward.
What the Research Shows So Far
Clinical research on the HOCATT system specifically is still limited, though research on its individual components (ozone therapy, PEMF, infrared sauna) is more established. One of the few studies using the actual HOCATT machine examined women with endometriosis pain. In that study, published on ResearchGate, eight women received transdermal ozone and PEMF therapy via the HOCATT twice a week for three weeks. Pain scores improved significantly after just the fourth session. A follow-up study with ten women measured blood markers of inflammation and found significant drops in C-reactive protein and interleukin-1 beta, both key indicators of systemic inflammation.
These are small studies, and they don’t prove the therapy works broadly. But they do suggest that the combination of ozone and PEMF delivered this way can produce measurable changes in inflammation and pain perception over a relatively short course of treatment.
Common Reasons People Try It
HOCATT therapy is offered at integrative and functional medicine clinics, medspas, and wellness centers. It is not a mainstream medical treatment and is not typically covered by insurance. People seek it out for a range of reasons:
- Chronic pain and inflammation: Particularly joint pain, fibromyalgia, and autoimmune-related discomfort.
- Athletic recovery: Reduced soreness and faster recovery between training sessions.
- Detoxification: Support for eliminating environmental toxins, especially for people with high toxic burden from occupational or environmental exposure.
- Immune support: Ozone therapy has a long history of use for immune modulation in integrative medicine.
- Skin conditions: Ozone’s effects on circulation, inflammation, and tissue oxygenation have been studied in the context of various skin diseases.
- General energy and wellness: Many users report improved mental clarity, better sleep, and a general sense of vitality after consistent sessions.
Limitations to Keep in Mind
The biggest caveat with HOCATT therapy is the gap between its theoretical promise and its clinical evidence base. Each individual technology has varying levels of scientific support. Ozone therapy and PEMF have the most robust research behind them, while essential oil infusions and color light therapy are less well studied. Combining all ten modalities makes it difficult to isolate which components are responsible for any given benefit, and large-scale clinical trials on the HOCATT system as a whole are still lacking.
Sessions typically cost between $100 and $250 each, depending on location and clinic, and a meaningful course of treatment usually involves multiple sessions over several weeks. The therapy is generally considered safe for most people, though it is not appropriate for those who are pregnant, have uncontrolled cardiovascular conditions, or have sensitivity to ozone exposure.