Red Light Therapy
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The Benefits of Red Light Therapy
What is Red Light Therapy?
Red and near infrared (NIR) light therapy, often simply referred to as “red light therapy”, is a type of therapy that uses specific wavelengths of light to bring about positive health benefits. This form of phototherapy uses wavelengths of light that are considered bioactive in humans.
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People use red light therapy to improve skin quality, speed wound healing, stimulate hair growth, reduce chronic pain, and improve workout recovery times. Studies indicate that red light therapy’s effects occur due to the stimulative effect that red and NIR wavelengths of light have on mitochondria, the energy center of the cells.
ADDITIONAL BENEFITS:
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Fat Loss & Fat Cell Reduction
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Increased Circulation
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The Formation of New Capillaries
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Increased Lymph System Activity
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Increased Production of Collagen & Fibroblasts
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Increased Release of Raw Cellular Energy
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Increased Cellular Cleanup
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Tissue Granulation Stimulated
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Inflammation Reduced
All of these things work together to produce many benefits for you in the areas of anti-aging, the healing of injuries, and the relief of pain.
What is Red and Near Infrared Light?
Red and near-infrared light are part of the electromagnetic spectrum and, more specifically, part of the spectrum of light emitted by the sun. These wavelengths of light are “bioactive” in humans.
The electromagnetic spectrum contains electromagnetic energy of many different wavelengths. The wavelength of this energy determines the properties it will have.
Below is a chart outlining the electromagnetic spectrum:
Electromagnetic waves vary greatly in wavelength, ranging from 0.0001 nanometers (gamma waves) all the way to over meters (radio waves). The shorter the wavelength, the greater the energy that a specific electromagnetic wavelength will contain.
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As many people will have learned in high school physics, when someone passes white light through a prism, it separates out the different colors based on their wavelengths. Only a tiny part of this spectrum (roughly 400nm to 700nm) is actually visible to the human eye.
The longest wavelength within the visible spectrum is red light, which goes from a little over 600nm to approximately 700nm. Longer wavelengths just outside the visible light spectrum are considered near-infrared (NIR). This part of the spectrum ranges from about 700nm to a little over 1,100nm.
Red Light Improves Cellular Energy Production
The best-studied mechanism of action surrounding red and near-infrared light therapy is the stimulation of mitochondrial energy production in the cells. Mitochondria are tiny organelles (organs within a cell) that produce all of the energy that our cells and our bodies ultimately need. Red light therapy is thought to primarily cause its positive effects by helping the mitochondria create more energy.
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All molecules and atoms absorb very specific wavelengths of light. The specific molecule within the mitochondria that is thought to absorb red and near-infrared light is a chemical called cytochrome C oxidase. Cytochrome C oxidase plays an absolutely essential role in transferring electrons down an electrochemical gradient in mitochondria called the electron transport chain.
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The electron transport chain is what drives the synthesis of ATP (adenosine triphosphate). ATP is a complex organic molecule that is considered the “currency” of energy in the body. While biological energy is derived from sugar, the energy in sugar would damage cells if it was all used at once. Mitochondria use a chemical reaction called the Krebs cycle to generate charged molecules. These charged molecules then pass through the electron transport chain, ultimately resulting in the synthesis of ATP.
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Red light therapy is ultimately thought to improve the efficiency and speed of the electron transport chain, improving the availability of ATP in the cells and throughout the body. This increased energy is what is thought to provide the many benefits that red light therapy is used for.
Red Light Therapy Reaches Deep Tissues
One of the reasons that red light therapy specifically offers unique benefits when compared to other wavelengths of light is that it can penetrate much deeper than shorter wavelengths of light. Higher energy light is absorbed more quickly and only enters the more superficial layers of body tissues.
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Short wavelengths of light, such as ultraviolet light, contain more energy than red or near-infrared light. These wavelengths, however, only reach the skin and do not penetrate deeply into the body.
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Red light and near-infrared light, conversely, have longer wavelengths and are able to reach much deeper, penetrating through many layers of body tissue. This has two main effects:
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It reaches a greater amount of body tissue. While the light passes through many layers of body tissue, it has the potential to interact with every cell it touches, allowing for a larger volume of tissue to be impacted.
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It reaches deep body tissue. Because it penetrates deeply, red and near-infrared light can reach areas of the body that are considered relatively inaccessible. Tissues like muscles, joints, and even brain tissues may be reached by these types of light.
It is important to keep in mind that while some wavelengths of light, such as green light, may reach a more medium depth, it is only red and near-infrared wavelengths that are considered to actually stimulate mitochondria. It is the effect of red light on mitochondria combined with its deep penetration that makes it such a valuable resource in phototherapy treatments.
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It is specifically these red and near-infrared wavelengths that have amazing effects on our bodies. Most research showing the benefits of red light and near-infrared light have used wavelengths in the ranges of 620-680nm and 800-880nm.
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There have been thousands of studies done in both animals and humans, examining the effects that it has on many different biological processes. Overall, red and near-infrared light has been repeatedly shown to have positive effects on cell function in animal and human studies and aid in improving a wide range of conditions.
Red Light Therapy Safety
Red light therapy is widely considered one of the safest forms of phototherapy. This is because red light and near-infrared light are low-energy forms of electromagnetic radiation. Short-wavelength light, like ultraviolet light, is considered high-energy light and carries known health risks, such as skin cancer and eye damage with retinal exposure.
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Red light does not carry any known safety risks. While red light therapy providers recommend wearing protective glasses during red light therapy out of an overabundance of caution, there is not even conclusive evidence that red light therapy causes eye damage. In fact, some evidence suggests there may be eye-related benefits to using red light therapy.
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While red light therapy is considered to be very safe, there are some circumstances where it is not recommended. These situations, however, are not due to known dangers that exist but to the fact that the safety has not been fully researched or proven. Red light therapy use on the abdomen during pregnancy, for example, is not known to cause any risks; however, it has not been conclusively proven to be safe and is not something that most researchers test in case there is some unknown negative effect.
Where Does Red Light Therapy Come From?
While the history of red light therapy would take a complete article to cover, the idea of phototherapy emerged in the late 1800s, with Dr. Niels Ryberg Finsen being awarded the 1903 Nobel Prize in Physiology or Medicine for his research in this area.
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The benefits of light therapy using red and near-infrared light specifically were discovered as an incidental finding of NASA research in the mid-1990s. Researchers examining red light’s impact on plant growth found that skin blemishes healed quickly while they were frequently exposed to red light, a finding that quickly led to a whole new body of research and resulted in the use of red light therapy in humans.
Why Use Red Light Therapy?
There are many potential reasons that people use red light therapy. As this form of phototherapy continues to be researched, new potential benefits of red light therapy are still being discovered.
We dive deeper into each potential benefit of red light therapy in other articles, but some red light therapy benefits may include:
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Stimulates wound healing and tissue repair
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Reduces aging effects by supporting collagen production
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Reduces pain by decreasing swelling and inflammation
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Improves joint health
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Improves physical performance through improved muscle recovery and energy levels
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Improves sleep quality and duration
The myriad of potential benefits that red light therapy offers makes regular use of this form of phototherapy a mainstay of many people’s daily health routines.
Decreased Exposure to Natural Light
The human body requires light to function, with light playing an important role in processes such as making vitamin D, causing our mood to be upbeat, and regulating our body’s daily circadian rhythm. It is no surprise that the red and near-infrared light found in sunlight has biological effects on our bodies as well.
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While light plays many important roles in health, humans are spending less and less time exposed to sunlight. Our housing, transport, and workspaces are often indoors, reducing our exposure to the health effects of natural sunlight. Energy-efficient windows in buildings and vehicles further limit the wavelengths of light that our bodies experience each day.
