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Phototherapy is certainly having a surge in popularity. There are now available illuminated devices for everything from dermatological concerns and fine lines along with muscle pain and oral inflammation, the latest being a dental hygiene device outfitted with miniature red light sources, described by its makers as “a major advance for domestic dental hygiene.” 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, which use infrared light to warm the body directly, the infrared radiation heats your body itself. According to its devotees, it’s like bathing in one of those LED-lit beauty masks, enhancing collagen production, relaxing muscles, reducing swelling and chronic health conditions and potentially guarding against cognitive decline.

Research and Reservations

“It appears somewhat mystical,” observes Paul Chazot, a scientist who has studied phototherapy extensively. Of course, certain impacts of light on human physiology are proven. Sunlight enables vitamin D production, crucial for strong bones, immune defense, and tissue repair. Sunlight regulates our circadian rhythms, additionally, 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 frequently help individuals with seasonal depression to boost low mood in winter. Clearly, light energy is essential for optimal functioning.

Types of Light Therapy

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, most other light therapy devices deploy red or infrared light. During advanced medical investigations, such as Chazot’s investigations into the effects of infrared on brain cells, determining the precise frequency is essential. Photons represent electromagnetic waves, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to short-wavelength gamma rays. Phototherapy, or light therapy employs mid-spectrum wavelengths, with ultraviolet representing the higher energy invisible light, followed by visible light encompassing rainbow colors and then infrared (which we can see with night-vision goggles).

Ultraviolet treatment has been employed by skin specialists for decades to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It modulates intracellular immune mechanisms, “and reduces inflammatory processes,” says a dermatology expert. “There’s lots of evidence for phototherapy.” UVA goes deeper into the skin than UVB, whereas the LEDs we see on consumer light-therapy devices (which generally deliver red, infrared or blue light) “tend to be a bit more superficial.”

Safety Protocols and Medical Guidance

Potential UVB consequences, including sunburn or skin darkening, are understood but clinical devices employ restricted wavelength ranges – meaning smaller wavelengths – which minimises the risks. “Therapy is overseen by qualified practitioners, meaning intensity is regulated,” explains the dermatologist. 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 regulations may be lax, and we don’t really know what wavelengths are being used.”

Commercial Products and Research Limitations

Colored light diodes, he says, “aren’t really used in the medical sense, but they may help with certain conditions.” Red LEDs, it is proposed, improve circulatory function, oxygen absorption and skin cell regeneration, and stimulate collagen production – a primary objective in youth preservation. “Research exists,” says Ho. “However, it’s limited.” In any case, amid the sea of devices now available, “it’s unclear if device outputs match study parameters. We don’t know the duration, proper positioning requirements, if benefits outweigh potential risks. There are lots of questions.”

Treatment Areas and Specialist Views

Early blue-light applications focused on skin microbes, a microbe associated with acne. Research support isn’t sufficient for standard medical recommendation – even though, says Ho, “it’s often seen in medical spas or aesthetics practices.” Some of his patients use it as part of their routine, he says, however for consumer products, “we just tell them to try it carefully and to make sure it has been assessed for safety. Without proper medical classification, the regulation is a bit grey.”

Innovative Investigations and Molecular Effects

Simultaneously, in innovative scientific domains, scientists have been studying cerebral tissue, discovering multiple mechanisms for infrared’s cellular benefits. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he says. Multiple claimed advantages have created skepticism toward light treatment – that it’s too good to be true. But his research has thoroughly changed his mind in that respect.

Chazot mostly works on developing drug treatments for neurodegenerative diseases, though twenty years earlier, a physician creating light-based cold sore therapy requested his biological knowledge. “He created some devices so that we could work with them with cells and with fruit flies,” he says. “I remained doubtful. This particular frequency was around 1070 nanometers, which most thought had no biological effect.”

What it did have going for it, though, was its efficient water penetration, meaning it could penetrate the body more deeply.

Mitochondrial Impact and Cognitive Support

Growing data suggested infrared influenced energy-producing organelles. Mitochondria produce ATP for cell function, producing fuel for biological processes. “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 consistently beneficial.”

With 1070 treatment, mitochondria also produce a small amount of a molecule known as reactive oxygen species. In low doses this substance, says Chazot, “stimulates so-called chaperone proteins which look after your mitochondria, look after your cells and also deal with the unwanted proteins.”

Such mechanisms indicate hope for cognitive disorders: oxidative protection, inflammation reduction, 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 says, several hundred individuals participated in various investigations, comprising his early research projects