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Light-based treatment is definitely experiencing a wave of attention. Consumers can purchase illuminated devices targeting issues like complexion problems and aging signs along with sore muscles and oral inflammation, the newest innovation is an oral care tool equipped with miniature red light sources, marketed by the company as “a major advance in personal mouth health.” Worldwide, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. You can even go and sit in an infrared sauna, where instead of hot coals (real or electric) heating the air, the thermal energy targets your tissues immediately. As claimed by enthusiasts, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, alleviating inflammatory responses and chronic health conditions while protecting against dementia.

The Science and Skepticism

“It sounds a bit like witchcraft,” says Paul Chazot, a scientist who has studied phototherapy extensively. Of course, certain impacts of light on human physiology are proven. Sunlight helps us make vitamin D, essential for skeletal strength, immune function, and muscular health. Light exposure controls our sleep-wake cycles, too, triggering the release of neurochemicals and hormones while we are awake, and winding down bodily functions for sleep as it fades into night. Daylight-simulating devices are standard treatment for winter mood disorders to elevate spirits during colder months. Undoubtedly, light plays a vital role in human health.

Various Phototherapy Approaches

Although mood lamps generally utilize blue-spectrum frequencies, consumer light therapy products mostly feature red and infrared emissions. In serious clinical research, such as Chazot’s investigations into the effects of infrared on brain cells, determining the precise frequency is essential. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to the highest-energy (gamma waves). Phototherapy, or light therapy uses wavelengths around the middle of this spectrum, with ultraviolet representing the higher energy invisible light, then the visible spectrum we perceive as colors and infrared light visible through night vision technology.

Dermatologists have utilized UV therapy for extensive periods to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It affects cellular immune responses, “and suppresses swelling,” says a dermatology expert. “There’s lots of evidence for phototherapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (which generally deliver red, infrared or blue light) “tend to be a bit more superficial.”

Risk Assessment and Professional Supervision

UVB radiation effects, like erythema or pigmentation, are understood but clinical devices employ restricted wavelength ranges – meaning smaller wavelengths – that reduces potential hazards. “Treatment is monitored by medical staff, meaning intensity is regulated,” notes the specialist. And crucially, the lightbulbs are calibrated by medical technicians, “to confirm suitable light frequency output – different from beauty salons, where it’s a bit unregulated, and emission spectra aren’t confirmed.”

Home Devices and Scientific Uncertainty

Colored light diodes, he explains, “don’t have strong medical applications, but they may help with certain conditions.” Red wavelength therapy, proponents claim, improve circulatory function, oxygen absorption and cell renewal in the skin, and activate collagen formation – a key aspiration in anti-ageing effects. “Research exists,” states the dermatologist. “But it’s not conclusive.” Regardless, amid the sea of devices now available, “it’s unclear if device outputs match study parameters. Appropriate exposure periods aren’t established, ideal distance from skin surface, the risk-benefit ratio. Many uncertainties remain.”

Treatment Areas and Specialist Views

One of the earliest blue-light products targeted Cutibacterium acnes, bacteria linked to pimples. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – even though, notes the dermatologist, “it’s often seen in medical spas or aesthetics practices.” Individuals include it in their skincare practices, he observes, however for consumer products, “we advise cautious experimentation and safety verification. Unless it’s a medical device, the regulation is a bit grey.”

Advanced Research and Cellular Mechanisms

Meanwhile, in a far-flung field of pioneering medical science, Chazot has been experimenting with brain 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. Multiple claimed advantages have created skepticism toward light treatment – that claims seem exaggerated. However, scientific investigation has altered his perspective.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, however two decades past, a doctor developing photonic antiviral treatment consulted his scientific background. “He designed tools for biological testing,” he recalls. “I was quite suspicious. It was an unusual wavelength of about 1070 nanometres, that nobody believed did anything biological.”

The advantage it possessed, though, was that it travelled through water easily, meaning it could penetrate the body more deeply.

Mitochondrial Effects and Brain Health

Additional research indicated infrared affected cellular mitochondria. Mitochondria are the powerhouses of cells, creating power for cellular operations. “All human cells contain mitochondria, even within brain tissue,” explains the neuroscientist, who, as a neuroscientist, decided to focus the research on brain cells. “Research confirms improved brain blood flow with phototherapy, which is always very good.”

With 1070 treatment, 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, preserve cell function and eliminate damaged proteins.”

All of these mechanisms appear promising for treating a brain disease: antioxidant, swelling control, and cellular cleanup – autophagy representing cellular waste disposal.

Present Investigation Status and Expert Assessments

When recently reviewing 1070nm research for cognitive decline, he reports, about 400 people were taking part in four studies, comprising his early research projects