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Phototherapy is definitely experiencing a wave of attention. You can now buy light-emitting tools designed to address complexion problems and aging signs to muscle pain and periodontal issues, recently introduced is a dental hygiene device equipped with small red light diodes, marketed by the company as “a breakthrough in personal mouth health.” Globally, the market was worth $1bn in 2024 and is projected to grow to $1.8bn by 2035. There are even infrared saunas available, 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, soothing sore muscles, relieving inflammation and long-term ailments while protecting against dementia.

The Science and Skepticism

“It appears somewhat mystical,” observes a Durham University professor, professor in neuroscience at Durham University and a convert to the value of light therapy. Of course, we know light influences biological functions. Sunlight enables vitamin D production, needed for bone health, immunity, muscles and more. Light exposure controls our sleep-wake cycles, additionally, activating brain chemicals and hormonal responses in daylight, and winding down bodily functions for sleep as it fades into night. Artificial sun lamps are standard treatment for winter mood disorders to elevate spirits during colder months. So there’s no doubt we need light energy to function well.

Types of Light Therapy

Although mood lamps generally utilize blue-spectrum frequencies, the majority of phototherapy tools use red or near-infrared wavelengths. During advanced medical investigations, like examinations of infrared influence on cerebral tissue, determining the precise frequency is essential. Light constitutes electromagnetic energy, spanning from low-energy radio waves to high-energy gamma radiation. Phototherapy, or light therapy utilizes intermediate light frequencies, the highest energy of those being invisible ultraviolet, then the visible spectrum we perceive as colors and finally infrared detectable with special equipment.

Ultraviolet treatment has been employed by skin specialists for decades to manage persistent skin disorders including eczema and psoriasis. It modulates intracellular immune mechanisms, “and reduces inflammatory processes,” says Dr Bernard Ho. “Substantial research supports light therapy.” UVA penetrates skin more deeply than UVB, in contrast to LEDs in commercial products (which generally deliver red, infrared or blue light) “generally affect surface layers.”

Safety Considerations and Medical Oversight

Potential UVB consequences, such as burning or tanning, are well known but in medical devices the light is delivered in a “narrow-band” form – meaning smaller wavelengths – which minimises the risks. “Treatment is monitored by medical staff, so the dosage is monitored,” explains the dermatologist. Most importantly, the devices are tuned by qualified personnel, “to ensure that the wavelength that’s being delivered is fit for purpose – different from beauty salons, where oversight might be limited, and we don’t really know what wavelengths are being used.”

Commercial Products and Research Limitations

Red and blue light sources, he explains, “don’t have strong medical applications, but they may help with certain conditions.” Red LEDs, it is proposed, enhance blood flow, oxygen utilization and skin cell regeneration, and activate collagen formation – an important goal for anti-aging. “Research exists,” says Ho. “But it’s not conclusive.” In any case, with numerous products on the market, “it’s unclear if device outputs match study parameters. Optimal treatment times are unknown, ideal distance from skin surface, the risk-benefit ratio. Many uncertainties remain.”

Specific Applications and Professional Perspectives

Early blue-light applications focused on skin microbes, a microbe associated with acne. Research support isn’t sufficient for standard medical recommendation – although, says Ho, “it’s often seen in medical spas or aesthetics practices.” Certain patients incorporate it into their regimen, he says, but if they’re buying a device for home use, “we recommend careful testing and security confirmation. Unless it’s a medical device, standards are somewhat unclear.”

Innovative Investigations and Molecular Effects

Simultaneously, in innovative scientific domains, Chazot has been experimenting with brain cells, discovering multiple mechanisms for infrared’s cellular benefits. “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. However, scientific investigation has altered his perspective.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, though twenty years earlier, 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 recalls. “I remained doubtful. This particular frequency was around 1070 nanometers, 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.

Mitochondrial Impact and Cognitive Support

Growing data suggested infrared influenced energy-producing organelles. These organelles generate cellular energy, generating energy for them to function. “Every cell in your body has mitochondria, including the brain,” says Chazot, who, as a neuroscientist, decided to focus the research on brain cells. “It has been shown that in humans this light therapy increases blood flow into the brain, which is consistently beneficial.”

With specific frequency application, energy organelles generate minimal reactive oxygen compounds. In low doses this substance, notes the scientist, “triggers guardian proteins that maintain organelle health, protect cellular integrity and manage defective proteins.”

Such mechanisms indicate hope for cognitive disorders: free radical neutralization, swelling control, and waste removal – autophagy representing cellular waste disposal.

Present Investigation Status and Expert Assessments

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he reports, several hundred individuals participated in various investigations, incorporating his preliminary American studies