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Phototherapy is clearly enjoying a wave of attention. Consumers can purchase illuminated devices designed to address dermatological concerns and fine lines along with aching tissues and gum disease, the newest innovation is 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. Options include full-body infrared sauna sessions, that employ light waves rather than traditional heat sources, the thermal energy targets your tissues immediately. According to its devotees, the experience resembles using an LED facial mask, boosting skin collagen, relaxing muscles, alleviating inflammatory responses and persistent medical issues while protecting against dementia.

The Science and Skepticism

“It sounds a bit like witchcraft,” observes a Durham University professor, a scientist who has studied phototherapy extensively. Naturally, some of light’s effects on our bodies are well established. Sunlight helps us make vitamin D, essential for skeletal strength, immune function, and muscular health. Sunlight regulates our circadian rhythms, too, triggering the release of neurochemicals and hormones while we are awake, and signaling the body to slow down for nighttime. Sunlight-imitating lamps are standard treatment for winter mood disorders to elevate spirits during colder months. Clearly, light energy is essential for optimal functioning.

Different Light Modalities

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, consumer light therapy products mostly feature red and infrared emissions. In serious clinical research, including research on infrared’s impact on neural cells, finding the right frequency is key. Light is a form of electromagnetic radiation, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to high-energy gamma radiation. Therapeutic light application employs mid-spectrum wavelengths, with ultraviolet representing the higher energy invisible light, followed by visible light encompassing rainbow colors and infrared light visible through night vision technology.

UV light has been used by medical dermatologists for many years for addressing long-term dermatological issues like vitiligo. It affects cellular immune responses, “and reduces inflammatory processes,” explains Dr Bernard Ho. “There’s lots of evidence for phototherapy.” UVA reaches deeper skin layers compared to UVB, while the LEDs in consumer devices (usually producing colored light emissions) “generally affect surface layers.”

Risk Assessment and Professional Supervision

Potential UVB consequences, like erythema or pigmentation, are well known but in medical devices the light is delivered in a “narrow-band” form – indicating limited wavelength spectrum – which minimises the risks. “Treatment is monitored by medical staff, thus exposure is controlled,” says Ho. And crucially, the lightbulbs are calibrated by medical technicians, “to ensure that the wavelength that’s being delivered is fit for purpose – unlike in tanning salons, 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 explains, “aren’t typically employed clinically, though they might benefit some issues.” Red LEDs, it is proposed, help boost blood circulation, oxygen uptake and cell renewal in the skin, and activate collagen formation – a key aspiration in anti-ageing effects. “Research exists,” states the dermatologist. “Although it’s not strong.” Regardless, given the plethora of available tools, “it’s unclear if device outputs match study parameters. We don’t know the duration, how close the lights should be to the skin, if benefits outweigh potential risks. There are lots of questions.”

Treatment Areas and Specialist Views

Early blue-light applications focused on skin microbes, microorganisms connected to breakouts. The evidence for its efficacy isn’t strong enough for it to be routinely prescribed by doctors – even though, says Ho, “it’s commonly used in cosmetic clinics.” Some of his patients use it as part of their routine, he observes, however for consumer products, “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, scientists have been studying cerebral tissue, 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 reports. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that results appear unrealistic. But his research has thoroughly changed his mind in that respect.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, but over 20 years ago, a GP who was developing an antiviral light treatment for cold sores sought his expertise as a biologist. “He developed equipment for cellular and insect experiments,” he says. “I was pretty sceptical. It was an unusual wavelength of about 1070 nanometres, which most thought had no biological effect.”

Its beneficial characteristic, though, was its ability to transmit through aqueous environments, meaning it could penetrate the body more deeply.

Cellular Energy and Neurological Benefits

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. Mitochondria produce ATP for cell function, creating power for cellular operations. “Mitochondria exist throughout the body, even within brain tissue,” says Chazot, who concentrated on cerebral applications. “It has been shown that in humans this light therapy increases blood flow into the brain, which is generally advantageous.”

With specific frequency application, cellular power plants create limited oxidative molecules. 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

When recently reviewing 1070nm research for cognitive decline, he reports, approximately 400 participants enrolled in multiple trials, incorporating his preliminary American studies