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Light therapy is definitely experiencing a surge in popularity. There are now available light-emitting tools designed to address skin conditions and wrinkles along with aching tissues and gum disease, recently introduced is a toothbrush outfitted with miniature red light sources, marketed by the company as “a significant discovery in at-home oral care.” Internationally, 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. Based on supporter testimonials, it’s like bathing in one of those LED-lit beauty masks, boosting skin collagen, relaxing muscles, reducing swelling and chronic health conditions while protecting against dementia.

Research and Reservations

“It appears somewhat mystical,” notes a Durham University professor, who has researched light therapy for two decades. Naturally, certain impacts of light on human physiology are proven. Sunlight helps us make vitamin D, essential for skeletal strength, immune function, and muscular health. Natural light synchronizes our biological clocks, as well, activating brain chemicals and hormonal responses in daylight, and preparing the body for rest as darkness falls. Artificial sun lamps frequently help individuals with seasonal depression 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, most other light therapy devices deploy red or infrared light. In serious clinical research, such as Chazot’s investigations into the effects of infrared on brain cells, finding the right frequency is key. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to short-wavelength gamma rays. Light-based treatment employs mid-spectrum wavelengths, the highest energy of those being invisible ultraviolet, then the visible spectrum we perceive as colors and finally infrared detectable with special equipment.

Ultraviolet treatment has been employed by skin specialists for decades for addressing long-term dermatological issues like vitiligo. It works on the immune system within cells, “and reduces inflammatory processes,” explains a skin specialist. “There’s lots of evidence for phototherapy.” UVA goes deeper into the skin than UVB, while the LEDs in consumer devices (which generally deliver red, infrared or blue light) “typically have shallower penetration.”

Risk Assessment and Professional Supervision

UVB radiation effects, including sunburn or skin darkening, are recognized but medical equipment uses controlled narrow-band delivery – signifying focused frequency bands – which minimises the risks. “Treatment is monitored by medical staff, thus exposure is controlled,” says Ho. Essentially, the light sources are adjusted by technical experts, “to confirm suitable light frequency output – as opposed to commercial tanning facilities, where regulations may be lax, and we don’t really know what wavelengths are being used.”

Commercial Products and Research Limitations

Red and blue LEDs, he says, “aren’t typically employed clinically, but could assist with specific concerns.” Red light devices, some suggest, enhance blood flow, oxygen absorption and cell renewal in the skin, and activate collagen formation – a primary objective in youth preservation. “Research exists,” states the dermatologist. “But it’s not conclusive.” Nevertheless, with numerous products on the market, “we don’t know whether or not the lights emitted are reflective of the research that has been done. We don’t know the duration, proper positioning requirements, the risk-benefit ratio. Many uncertainties remain.”

Specific Applications and Professional Perspectives

One of the earliest blue-light products targeted Cutibacterium acnes, a microbe associated with acne. Research support isn’t sufficient for standard medical recommendation – although, notes the dermatologist, “it’s commonly used in cosmetic clinics.” Some of his patients use it as part of their routine, he observes, though when purchasing home devices, “we just tell them to try it carefully and to make sure it has been assessed for safety. Unless it’s a medical device, standards are somewhat unclear.”

Cutting-Edge Studies and Biological Processes

At the same time, in a far-flung field of pioneering medical science, Chazot has been experimenting with brain cells, identifying a number of ways in which infrared can boost cellular health. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he reports. The numerous reported benefits have generated doubt regarding phototherapy – that it’s too good to be true. Yet, experimental evidence has transformed his viewpoint.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, however two decades past, a physician creating light-based cold sore therapy requested his biological knowledge. “He developed equipment for cellular and insect experiments,” he says. “I was quite suspicious. It was an unusual wavelength of about 1070 nanometres, which most thought had no biological effect.”

Its beneficial characteristic, however, was that it travelled through water easily, allowing substantial bodily penetration.

Mitochondrial Impact and Cognitive Support

Additional research indicated infrared affected cellular mitochondria. Mitochondria produce ATP for cell function, producing fuel for biological processes. “Every cell in your body has mitochondria, even within brain tissue,” explains the neuroscientist, 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 consistently beneficial.”

Using 1070nm wavelength, cellular power plants create limited oxidative molecules. In low doses this substance, notes the scientist, “activates protective proteins that safeguard mitochondria, protect cellular integrity and manage defective proteins.”

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

Current Research Status and Professional Opinions

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he says, several hundred individuals participated in various investigations, comprising his early research projects