Carbon dioxide (CO2) is a fascinating molecule with many important roles in human physiology. Most people know CO2 primarily as a natural part of respiration and the body’s acid-base balance, but this gas has also received increasing attention in research, medicine, and wellness. This article takes a closer look at how CO2 works in the body, which biological mechanisms are involved, and which possible areas of use have been explored in therapy, recovery, skin treatment, and general well-being.
CO2 therapy is a collective term for methods in which the body is exposed to carbon dioxide, either through inhalation of a controlled mixture of CO2 and oxygen, through transdermal exposure via the skin, or by using special equipment that directs CO2 to specific areas of the body. The purpose of such methods includes influencing blood circulation, oxygen supply, nitric oxide production, and cellular metabolism.
Among the effects often discussed in connection with CO2 therapy are support for normal blood circulation, improved oxygen availability in tissues, effects on skin quality and elasticity, as well as support for the body’s natural recovery processes. CO2 has also been investigated in research related to inflammatory processes, wound healing, peripheral circulation, and various forms of recovery. In wellness, CO2 is often used in connection with relaxation, skin renewal, increased comfort in muscles, and general support for the body’s physiological balance.
Possible areas of use described in the literature on CO2 therapy include:
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support for blood circulation and microcirculation
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better oxygen availability in tissues through the Bohr effect
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support for skin renewal and skin elasticity
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soothing effect on tension and discomfort in muscles and joints
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support for wound healing and local tissue repair
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effects on cellular energy metabolism
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increased well-being, relaxation, and recovery
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support for skin tone, radiance, and cosmetic skin improvement
One method of administering CO2 is the use of a full-body suit or body suit, in which the body is exposed to a high concentration of CO2 while the head is kept outside. In such systems, the air is first removed from the suit before it is filled with CO2 gas. The idea behind this method is that CO2 is absorbed through the skin and affects the blood vessels locally and systemically. Such solutions are used in some settings within wellness, recovery, skincare, and various forms of physical training.
CO2 inhalation
Another method is inhalation of a controlled mixture of CO2 and oxygen using a mask or a mouthpiece. This is a more direct method that primarily affects respiration and gas exchange. In research contexts, such methods have been studied in relation to lung function, oxygenation, circulation, and the autonomic nervous system. Such solutions require particular caution, precise dosing, and professional assessment.
CO2 and beauty treatments
In recent years, carbon dioxide treatments have become increasingly popular in aesthetic dermatology and cosmetic skincare. The aim of these treatments is usually to improve the appearance of the skin, stimulate microcirculation, and support the skin’s own regenerative processes.
Two main forms of CO2 treatment are especially well known in cosmetic use: subcutaneous CO2 injections and CO2 gel, also called carboxy gel. Although both methods aim to improve skin quality and oxygen supply, they differ clearly from each other in terms of invasiveness, area of use, and comfort.
Subcutaneous CO2 injections are used in some aesthetic settings to stimulate local circulation and tissue oxygenation. This may contribute to increased collagen formation and support the skin’s structure and firmness. Such injections have been used in work on fine lines, scars, dark circles under the eyes, skin laxity, and certain areas with cellulite or stretch marks. However, the method is more localized, more invasive, and may be experienced as less comfortable than surface-based treatments.
CO2 gel is a non-invasive alternative that can be used on larger skin areas, including the entire face. When the gel is activated on the skin surface, CO2 bubbles are formed, which may stimulate the Bohr effect locally. This may contribute to increased oxygen availability in the skin and provide a feeling of fresher, clearer, and more vital skin. Because this method is easy to use and usually more comfortable, it has become a popular option for home use and regular skincare.
Benefits often highlighted for CO2 gel and carboxy treatments include:
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support for skin renewal and collagen production
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improved skin elasticity and resilience
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reduced visibility of fine lines and wrinkles
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improved blood circulation in the skin
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more even skin tone and increased radiance
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support for loose skin and loss of firmness
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reduction in the visibility of large pores
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cosmetic support for cellulite and stretch marks
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improved circulation around the eye area
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possible support for the scalp and hair growth in certain contexts
CO2 in combination with hydrogen and infrared light
Some studies and theoretical models have suggested that CO2 therapy may be combined with other technologies, such as molecular hydrogen (H2) and infrared light (IR), to achieve complementary or synergistic effects. Hydrogen is known to be a small molecule with interesting properties related to antioxidant balance, cellular protection, and signal regulation. Infrared light and photobiomodulation, in turn, have been investigated for their effects on mitochondrial function, circulation, tissue repair, and energy production.
CO2 also has a well-known physical property in that the molecule can absorb and re-emit infrared radiation. When CO2 molecules absorb infrared photons, they are set into vibration and temporarily store energy. The energy can then be released as new infrared radiation or transferred to other molecules through collisions. This is an important physical property of CO2 and is relevant in both biological and non-biological systems.
Scientific background: CO2 in human physiology
CO2 is a natural byproduct of the cells' energy metabolism and holds a central place in human physiology. The gas is far more than just a waste product of metabolism. It is crucial for respiration, pH regulation, oxygen transport, blood flow, and several cellular signaling processes.
CO2 in metabolism and respiration
During cellular respiration, glucose and oxygen are converted into adenosine triphosphate (ATP), which is the cells' main source of energy. In this process, CO2 is formed as a natural end product. CO2 is then transported in the blood to the lungs, where it is eliminated through exhalation.
CO2 and regulation of blood pH
CO2 plays an important role in the regulation of acid-base balance. When CO2 dissolves in fluid, carbonic acid is formed, which can then dissociate further into hydrogen ions and bicarbonate. This is part of the body's most important buffer system and helps keep blood pH within a very narrow and physiologically necessary range.
The Bohr effect
One of the most important physiological effects of CO2 is the Bohr effect. This describes how increased levels of CO2 reduce hemoglobin's affinity for oxygen. The result is that oxygen is more easily released from the blood and delivered to tissues that need it most, especially during physical activity or increased metabolic stress. This is an absolutely central mechanism for efficient oxygen distribution in the body.
Therapeutic and research applications of CO2
CO2 has been studied in a range of contexts where the goal is to influence blood circulation, tissue oxygenation, inflammation, and regeneration. Various methods include carbon dioxide baths, transdermal CO2 application, gel-based solutions, local administration, and inhalation-based systems.
Research has, among other things, investigated CO2 in connection with wound healing, fracture healing, support for peripheral circulation, tissue perfusion, skin treatment, and various recovery processes. Some studies suggest that CO2 may contribute to increased blood flow, greater capillary density, and improved local oxygen supply. This has been explained, among other things, through vasodilation, increased production of nitric oxide, and improved oxygen release via the Bohr effect.
In diabetes-related circulatory challenges and slow wound healing, CO2 has also been investigated as a possible support for better tissue perfusion and regeneration. Furthermore, there is research suggesting that CO2 may influence inflammatory processes and cellular signaling in ways that are relevant to both recovery and tissue adaptation.
There is also experimental research in which CO2 has been investigated in relation to tumor growth and metastasis. This is a complex and research-oriented area, and such findings must be interpreted with great caution. As of today, this does not provide a basis for general treatment claims, but it illustrates that CO2 is a biologically active molecule with broader effects than previously assumed.
Mechanisms behind CO2 therapy
Several mechanisms have been proposed to explain the observed effects of CO2 therapy:
Vasodilation and increased blood flow
CO2 may contribute to the dilation of blood vessels, which increases blood flow in the tissue. Better circulation can support the transport of oxygen and nutrients, as well as contribute to more efficient removal of waste products.
Improved oxygen release
Through the Bohr effect, CO2 may help oxygen be released more easily from hemoglobin to the cells. This may be particularly relevant in tissues with high metabolic activity or impaired circulation.
Influence on cellular signaling
CO2 also appears to be able to influence various signaling pathways in the cells. This may include mechanisms related to angiogenesis, inflammation regulation, mitochondrial function, and cellular adaptation.
Anti-inflammatory effects
Some studies indicate that CO2 may influence inflammatory processes in a favorable direction. This appears to occur through several mechanisms, including the regulation of signaling molecules and effects on local tissue physiology.
Conclusion
Carbon dioxide is a fundamental and biologically important molecule with a far more complex role in the body than many people realize. From energy metabolism and pH regulation to oxygen transport, circulation, and cellular signaling, CO2 is a central part of the body’s function. At the same time, interest is growing in how the controlled use of CO2 may be applied in research, wellness, recovery, and various forms of supportive therapy.
CO2 therapy represents an exciting and developing field, both in aesthetics, circulatory support, and physiological optimization. Although much of the research is still evolving, existing knowledge indicates that CO2 has interesting properties that deserve further attention.
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Author: Jan F. Poleszynski, head of the Clinic for Integrated Medicine
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