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Light therapy is definitely experiencing a wave of attention. You can now buy glowing gadgets targeting issues like complexion problems and aging signs as well as aching tissues and gum disease, recently introduced is an oral care tool outfitted with miniature red light sources, described by its makers as “a major advance for domestic dental hygiene.” Internationally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. There are even infrared saunas available, which use infrared light to warm the body directly, your body is warmed directly by infrared light. According to its devotees, the experience resembles using an LED facial mask, stimulating skin elasticity, relaxing muscles, reducing swelling and chronic health conditions and potentially guarding against cognitive decline.

Research and Reservations

“It appears somewhat mystical,” observes a Durham University professor, a scientist who has studied phototherapy extensively. Of course, certain impacts of light on human physiology are proven. Sunlight enables vitamin D production, needed for bone health, immunity, muscles and more. Light exposure controls our sleep-wake cycles, as well, triggering the release of neurochemicals and hormones while we are awake, and preparing the body for rest as darkness falls. Artificial sun lamps are a common remedy for people with seasonal affective disorder (Sad) to boost low mood in winter. Clearly, light energy is essential for optimal functioning.

Various Phototherapy Approaches

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, consumer light therapy products mostly feature red and infrared emissions. In rigorous scientific studies, like examinations of infrared influence on cerebral tissue, identifying the optimal wavelength is crucial. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to high-energy gamma radiation. Light-based treatment employs mid-spectrum wavelengths, the highest energy of those being invisible ultraviolet, then visible light (all the colours we see in a rainbow) and then infrared (which we can see with night-vision goggles).

Ultraviolet treatment has been employed by skin specialists for decades to manage persistent skin disorders including eczema and psoriasis. It affects cellular immune responses, “and suppresses swelling,” says a dermatology expert. “Considerable data validates phototherapy.” UVA reaches deeper skin layers compared to UVB, in contrast to LEDs in commercial products (usually producing colored light emissions) “typically have shallower penetration.”

Safety Protocols and Medical Guidance

Potential UVB consequences, such as burning or tanning, are recognized but medical equipment uses controlled narrow-band delivery – indicating limited wavelength spectrum – which minimises the risks. “Therapy is overseen by qualified practitioners, meaning intensity is regulated,” notes the specialist. Essentially, the light sources are adjusted by technical experts, “to confirm suitable light frequency output – unlike in tanning salons, where it’s a bit unregulated, and wavelength accuracy isn’t verified.”

Commercial Products and Research Limitations

Red and blue light sources, he notes, “don’t have strong medical applications, but they may help with certain conditions.” Red wavelength therapy, proponents claim, help boost blood circulation, oxygen utilization and dermal rejuvenation, and activate collagen formation – an important goal for anti-aging. “Studies are available,” states the dermatologist. “But it’s not conclusive.” Nevertheless, given the plethora of available tools, “it’s unclear if device outputs match study parameters. We don’t know the duration, how close the lights should be to the skin, whether or not that will increase the risk versus the benefit. There are lots of questions.”

Treatment Areas and Specialist Views

One of the earliest blue-light products targeted Cutibacterium acnes, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – although, explains the specialist, “it’s often seen in medical spas or aesthetics practices.” Certain patients incorporate it into their regimen, he says, however for consumer products, “we recommend careful testing and security confirmation. Unless it’s a medical device, standards are somewhat unclear.”

Cutting-Edge Studies and Biological Processes

Simultaneously, in a far-flung field of pioneering medical science, researchers have been testing neural cells, revealing various pathways for light-enhanced cell function. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he states. The numerous reported benefits have generated doubt regarding phototherapy – that results appear unrealistic. Yet, experimental evidence has transformed his viewpoint.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, though twenty years earlier, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He designed tools for biological testing,” he explains. “I remained doubtful. This particular frequency was around 1070 nanometers, which most thought had no biological effect.”

Its beneficial characteristic, though, was its ability to transmit through aqueous environments, allowing substantial bodily penetration.

Cellular Energy and Neurological Benefits

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. Mitochondria produce ATP for cell function, generating energy for them to function. “Mitochondria exist throughout the body, including the brain,” says Chazot, who, as a neuroscientist, decided to focus the research on brain cells. “It has been shown that in humans this light therapy increases blood flow into the brain, which is always very good.”

Using 1070nm wavelength, cellular power plants create limited oxidative molecules. In limited quantities these molecules, explains the expert, “stimulates so-called chaperone proteins which look after your mitochondria, protect cellular integrity and manage defective proteins.”

Such mechanisms indicate hope for cognitive disorders: free radical neutralization, inflammation reduction, and pro-autophagy – autophagy representing cellular waste disposal.

Present Investigation Status and Expert Assessments

When recently reviewing 1070nm research for cognitive decline, he reports, approximately 400 participants enrolled in multiple trials, comprising his early research projects