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Light therapy is clearly enjoying a surge in popularity. Consumers can purchase illuminated devices designed to address skin conditions and wrinkles to muscle pain and oral inflammation, the newest innovation is a toothbrush equipped with small red light diodes, promoted by the creators as “a breakthrough in at-home oral care.” Worldwide, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. Options include full-body infrared sauna sessions, that employ light waves rather than traditional heat sources, your body is warmed directly by infrared light. As claimed by enthusiasts, the experience resembles using an LED facial mask, stimulating skin elasticity, relaxing muscles, relieving inflammation and chronic health conditions and potentially guarding against cognitive decline.

The Science and Skepticism

“It appears somewhat mystical,” says Paul Chazot, who has researched light therapy for two decades. Of course, certain impacts of light on human physiology are proven. Our bodies produce vitamin D through sun exposure, crucial for strong bones, immune defense, and tissue repair. Light exposure controls our sleep-wake cycles, as well, triggering the release of neurochemicals and hormones while we are awake, and signaling the body to slow down for nighttime. Artificial sun lamps frequently help individuals with seasonal depression to boost low mood in winter. Clearly, light energy is essential for optimal functioning.

Various Phototherapy Approaches

Although mood lamps generally utilize blue-spectrum frequencies, the majority of phototherapy tools use red or near-infrared wavelengths. In rigorous scientific studies, including research on infrared’s impact on neural cells, identifying the optimal wavelength is crucial. Light is a form of electromagnetic radiation, which runs the spectrum from the lowest-energy, longest wavelengths (radio waves) to high-energy gamma radiation. Light-based treatment utilizes intermediate light frequencies, including invisible ultraviolet radiation, followed by visible light encompassing rainbow 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 affects cellular immune responses, “and reduces inflammatory processes,” explains Dr Bernard Ho. “There’s lots of evidence for phototherapy.” UVA penetrates skin more deeply than UVB, in contrast to LEDs in commercial products (usually producing colored light emissions) “tend to be a bit more superficial.”

Safety Protocols and Medical Guidance

Potential UVB consequences, including sunburn or skin darkening, are well known but in medical devices the light is delivered in a “narrow-band” form – indicating limited wavelength spectrum – which minimises the risks. “Therapy is overseen by qualified practitioners, thus exposure is controlled,” says Ho. And crucially, the light sources are adjusted by technical experts, “to confirm suitable light frequency output – as opposed to commercial tanning facilities, where it’s a bit unregulated, and wavelength accuracy isn’t verified.”

Commercial Products and Research Limitations

Red and blue LEDs, he explains, “aren’t really used in the medical sense, though they might benefit some issues.” Red light devices, some suggest, help boost blood circulation, oxygen utilization and skin cell regeneration, and stimulate collagen production – an important goal for anti-aging. “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, ideal distance from skin surface, whether or not that will increase the risk versus the benefit. Numerous concerns persist.”

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 – despite the fact that, says Ho, “it’s frequently employed in beauty centers.” Some of his patients use it as part of their routine, he observes, however for consumer products, “we recommend careful testing and security confirmation. Without proper medical classification, the regulation is a bit grey.”

Cutting-Edge Studies and Biological Processes

Simultaneously, in innovative scientific domains, researchers have been testing neural cells, revealing various pathways for light-enhanced cell function. “Nearly every test with precise light frequencies demonstrated advantageous outcomes,” he reports. Multiple claimed advantages have created skepticism toward light treatment – that results appear unrealistic. However, scientific investigation has altered his perspective.

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 designed tools for biological testing,” he says. “I remained doubtful. The specific wavelength measured approximately 1070nm, which most thought had no biological effect.”

The advantage it possessed, though, was its efficient water penetration, meaning it could penetrate the body more deeply.

Mitochondrial Effects and Brain Health

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. Mitochondria are the powerhouses of cells, creating power for cellular operations. “Every cell in your body has mitochondria, including the brain,” notes the researcher, who prioritized neurological investigations. “It has been shown that in humans this light therapy increases blood flow into the brain, which is generally advantageous.”

With specific frequency application, energy organelles generate minimal reactive oxygen compounds. At controlled levels these compounds, says Chazot, “stimulates so-called chaperone proteins which look after your mitochondria, preserve cell function and eliminate damaged proteins.”

All of these mechanisms appear promising for treating a brain disease: oxidative protection, inflammation reduction, and cellular cleanup – autophagy being the process the cell uses to clear unwanted damaging proteins.

Ongoing Study Progress and Specialist Evaluations

When recently reviewing 1070nm research for cognitive decline, he says, several hundred individuals participated in various investigations, including his own initial clinical trials in the US