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Phototherapy is clearly enjoying a moment. Consumers can purchase glowing gadgets designed to address skin conditions and wrinkles to sore muscles and periodontal issues, the newest innovation is an oral care tool outfitted with small red light diodes, described by its makers as “a significant discovery in personal mouth health.” Worldwide, the sector valued at $1bn last year is expected to increase to $1.8bn within the next decade. You can even go and sit in an infrared sauna, where instead of hot coals (real or electric) heating the air, your body is warmed directly by infrared light. According to its devotees, it’s like bathing in one of those LED-lit beauty masks, stimulating skin elasticity, easing muscle tension, relieving inflammation and chronic health conditions while protecting against dementia.

Research and Reservations

“It feels almost magical,” observes Paul Chazot, who has researched light therapy for two decades. Of course, we know light influences biological functions. Sunlight helps us make vitamin D, needed for bone health, immunity, muscles and more. Natural light synchronizes our biological clocks, as well, triggering the release of neurochemicals and hormones while we are awake, and winding down bodily functions for sleep as it fades into night. Artificial sun lamps are standard treatment for winter mood disorders to combat seasonal emotional slumps. Clearly, light energy is essential for optimal functioning.

Various Phototherapy Approaches

Although mood lamps generally utilize blue-spectrum frequencies, most other light therapy devices deploy red or infrared light. During advanced medical investigations, like examinations of infrared influence on cerebral tissue, finding the right frequency is key. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to the highest-energy (gamma waves). Phototherapy, or light therapy employs mid-spectrum wavelengths, with ultraviolet representing the higher energy invisible light, followed by visible light encompassing rainbow colors and finally infrared detectable with special equipment.

UV light has been used by medical dermatologists for many years to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It works on the immune system within cells, “and reduces inflammatory processes,” notes a skin specialist. “Substantial research supports light therapy.” UVA reaches deeper skin layers compared to UVB, whereas the LEDs we see on consumer light-therapy devices (typically emitting red, infrared or blue wavelengths) “tend to be a bit more superficial.”

Risk Assessment and Professional Supervision

UVB radiation effects, including sunburn or skin darkening, are understood but clinical devices employ restricted wavelength ranges – meaning smaller wavelengths – that reduces potential hazards. “It’s supervised by a healthcare professional, meaning intensity is regulated,” notes the specialist. Most importantly, the lightbulbs are calibrated by medical technicians, “to ensure that the wavelength that’s being delivered is fit for purpose – as opposed to commercial tanning facilities, where it’s a bit unregulated, and we don’t really know what wavelengths are being used.”

Commercial Products and Research Limitations

Red and blue LEDs, he notes, “don’t have strong medical applications, but could assist with specific concerns.” Red light devices, some suggest, help boost blood circulation, oxygen utilization and dermal rejuvenation, and stimulate collagen production – a key aspiration in anti-ageing effects. “Research exists,” states the dermatologist. “However, it’s limited.” Nevertheless, amid the sea of devices now available, “it’s unclear if device outputs match study parameters. Appropriate exposure periods aren’t established, how close the lights should be to the skin, the risk-benefit ratio. Many uncertainties remain.”

Targeted Uses and Expert Opinions

Initial blue-light devices addressed acne bacteria, a microbe associated with acne. Research support isn’t sufficient for standard medical recommendation – even though, explains the specialist, “it’s often seen in medical spas or aesthetics practices.” Individuals include it in their skincare practices, 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, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

Meanwhile, in innovative scientific domains, 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 states. The numerous reported benefits have generated doubt regarding phototherapy – that it’s too good to be true. Yet, experimental evidence has transformed his viewpoint.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, but over 20 years ago, a physician creating light-based cold sore therapy requested his biological knowledge. “He developed equipment for cellular and insect experiments,” he explains. “I was pretty sceptical. It was an unusual wavelength of about 1070 nanometres, that nobody believed did anything biological.”

Its beneficial characteristic, though, was its efficient water penetration, enabling deeper tissue penetration.

Mitochondrial Impact and Cognitive Support

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. These organelles generate cellular energy, generating energy for them to function. “All human cells contain mitochondria, particularly in neural cells,” says Chazot, who prioritized neurological investigations. “Studies demonstrate enhanced cerebral circulation with light treatment, which is always very good.”

With 1070 treatment, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In limited quantities these molecules, explains the expert, “activates protective proteins that safeguard mitochondria, protect cellular integrity and manage defective proteins.”

Such mechanisms indicate hope for cognitive disorders: free radical neutralization, anti-inflammatory, and cellular cleanup – autophagy being the process the cell uses to clear unwanted damaging proteins.

Ongoing Study Progress and Specialist Evaluations

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he reports, about 400 people were taking part in four studies, incorporating his preliminary American studies