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Phototherapy is clearly enjoying a surge in popularity. There are now available glowing gadgets for everything from dermatological concerns and fine lines as well as sore muscles and gum disease, the latest being a dental hygiene device enhanced with small red light diodes, described by its makers as “a breakthrough in at-home oral care.” Internationally, 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, that employ light waves rather than traditional heat sources, the thermal energy targets your tissues immediately. Based on supporter testimonials, it feels similar to a full-body light therapy session, enhancing collagen production, easing muscle tension, reducing swelling and chronic health conditions and potentially guarding against cognitive decline.

The Science and Skepticism

“It feels almost magical,” notes Paul Chazot, who has researched light therapy for two decades. Of course, we know light influences biological functions. Sunlight enables vitamin D production, essential for skeletal strength, immune function, and muscular health. Sunlight regulates our circadian rhythms, additionally, activating brain chemicals and hormonal responses in daylight, and winding down bodily functions for sleep as it fades into night. Daylight-simulating devices frequently help individuals with seasonal depression to elevate spirits during colder months. So there’s no doubt we need light energy to function well.

Various Phototherapy Approaches

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, the majority of phototherapy tools use red or near-infrared wavelengths. In serious clinical research, such as Chazot’s investigations into the effects of infrared on brain cells, finding the right frequency is key. Light constitutes electromagnetic energy, spanning from low-energy radio waves to short-wavelength gamma rays. Phototherapy, or light therapy uses wavelengths around the middle of this spectrum, including invisible ultraviolet radiation, followed by visible light encompassing rainbow colors and then infrared (which we can see with night-vision goggles).

Dermatologists have utilized UV therapy for extensive periods for addressing long-term dermatological issues like vitiligo. It affects cellular immune responses, “and dampens down inflammation,” explains a skin specialist. “Substantial research supports light therapy.” UVA goes deeper into the skin than UVB, in contrast to LEDs in commercial products (typically emitting red, infrared or blue wavelengths) “tend to be a bit more superficial.”

Safety Considerations and Medical Oversight

UVB radiation effects, including sunburn or skin darkening, are well known but in medical devices the light is delivered in a “narrow-band” form – signifying focused frequency bands – which minimises the risks. “Treatment is monitored by medical staff, so the dosage is monitored,” explains the dermatologist. Most importantly, the lightbulbs are calibrated by medical technicians, “to confirm suitable light frequency output – as opposed to commercial tanning facilities, where oversight might be limited, and wavelength accuracy isn’t verified.”

Consumer Devices and Evidence Gaps

Red and blue LEDs, he notes, “aren’t really used in the medical sense, but could assist with specific concerns.” Red light devices, some suggest, improve circulatory function, oxygen uptake and dermal rejuvenation, and promote collagen synthesis – a primary objective in youth preservation. “The evidence is there,” says Ho. “But it’s not conclusive.” Nevertheless, amid the sea of devices now available, “we’re uncertain whether commercial devices replicate research conditions. We don’t know the duration, proper positioning requirements, the risk-benefit ratio. There are lots of questions.”

Treatment Areas and Specialist Views

Initial blue-light devices addressed acne bacteria, microorganisms connected to breakouts. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – even though, explains the specialist, “it’s commonly used in cosmetic clinics.” Some of his patients use it as part of their routine, he says, though when purchasing home devices, “we advise cautious experimentation and safety verification. Unless it’s a medical device, standards are somewhat unclear.”

Advanced Research and Cellular Mechanisms

At the same time, in innovative scientific domains, Chazot has been experimenting with brain cells, revealing various pathways for light-enhanced cell function. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he reports. The numerous reported benefits have generated doubt regarding phototherapy – 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 GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He created some devices so that we could work with them with cells and with fruit flies,” he recalls. “I was quite suspicious. The specific wavelength measured approximately 1070nm, that nobody believed did anything biological.”

What it did have going for it, though, was that it travelled through water easily, allowing substantial bodily penetration.

Mitochondrial Impact and Cognitive Support

Additional research indicated infrared affected cellular mitochondria. Mitochondria are the powerhouses of cells, producing fuel for biological processes. “Mitochondria exist throughout the body, even within brain tissue,” explains the neuroscientist, who, as a neuroscientist, decided to focus the research on brain cells. “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, says Chazot, “triggers guardian proteins that maintain organelle health, preserve cell function and eliminate damaged proteins.”

All of these mechanisms appear promising for treating a brain disease: free radical neutralization, swelling control, and waste removal – autophagy being the process the cell uses to clear unwanted damaging proteins.

Current Research Status and Professional Opinions

Upon examining current studies on light therapy for dementia, he states, several hundred individuals participated in various investigations, including his own initial clinical trials in the US