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Light-based treatment is certainly having a moment. There are now available light-emitting tools designed to address skin conditions and wrinkles along with sore muscles and periodontal issues, recently introduced is a toothbrush equipped with small red light diodes, described by its makers as “a significant discovery in at-home oral care.” Internationally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. Options include full-body infrared sauna sessions, which use infrared light to warm the body directly, the thermal energy targets your tissues immediately. According to its devotees, the experience resembles using an LED facial mask, boosting skin collagen, relaxing muscles, relieving inflammation and chronic health conditions while protecting against dementia.

The Science and Skepticism

“It sounds a bit like witchcraft,” says a Durham University professor, professor in neuroscience at Durham University and a convert to the value of light therapy. Certainly, some of light’s effects on our bodies are well established. Sunlight helps us make vitamin D, crucial for strong bones, immune defense, and tissue repair. Sunlight regulates our circadian rhythms, as well, stimulating neurotransmitter and hormone production during daytime, and preparing the body for rest as darkness falls. Daylight-simulating devices are a common remedy for people with seasonal affective disorder (Sad) to elevate spirits during colder months. Clearly, light energy is essential for optimal functioning.

Various Phototherapy Approaches

Although mood lamps generally utilize blue-spectrum frequencies, consumer light therapy products mostly feature red and infrared emissions. In rigorous scientific studies, such as Chazot’s investigations into the effects of infrared on brain cells, finding the right frequency is key. Light is a form of electromagnetic radiation, extending from long-wavelength radiation to the highest-energy (gamma waves). Light-based treatment uses wavelengths around the middle of this spectrum, including invisible ultraviolet radiation, then the visible spectrum we perceive as colors and finally infrared detectable with special equipment.

Dermatologists have utilized UV therapy for extensive periods for addressing long-term dermatological issues like vitiligo. It affects cellular immune responses, “and reduces inflammatory processes,” says a skin specialist. “Considerable data validates phototherapy.” UVA reaches deeper skin layers compared to UVB, while the LEDs in consumer devices (usually producing colored light emissions) “tend to be a bit more superficial.”

Safety Considerations and Medical Oversight

Potential UVB consequences, including sunburn or skin darkening, are recognized but medical equipment uses controlled narrow-band delivery – meaning smaller wavelengths – that reduces potential hazards. “Therapy is overseen by qualified practitioners, meaning intensity is regulated,” notes the specialist. Most importantly, the devices are tuned by qualified personnel, “to ensure that the wavelength that’s being delivered is fit for purpose – unlike in tanning salons, where regulations may be lax, and emission spectra aren’t confirmed.”

Home Devices and Scientific Uncertainty

Red and blue light sources, he says, “aren’t typically employed clinically, but they may help with certain conditions.” Red wavelength therapy, proponents claim, help boost blood circulation, oxygen absorption and dermal rejuvenation, and activate collagen formation – a key aspiration in anti-ageing effects. “The evidence is there,” states the dermatologist. “But it’s not conclusive.” Regardless, with numerous products on the market, “we don’t know whether or not the lights emitted are reflective of the research that has been done. Optimal treatment times are unknown, ideal distance from skin surface, the risk-benefit ratio. Numerous concerns persist.”

Treatment Areas and Specialist Views

Early blue-light applications focused on skin microbes, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – although, notes the dermatologist, “it’s often seen in medical spas or aesthetics practices.” Certain patients incorporate it into their regimen, he observes, though when purchasing home devices, “we just tell them to try it carefully and to make sure it has been assessed for safety. If it’s not medically certified, oversight remains ambiguous.”

Advanced Research and Cellular Mechanisms

At the same time, in advanced research areas, scientists have been studying cerebral tissue, identifying a number of ways in which infrared can boost cellular health. “Pretty much everything I did with the light at that particular wavelength was positive and protective,” he says. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that results appear unrealistic. However, scientific investigation has altered his perspective.

The scientist mainly develops medications for neurological conditions, however two decades past, a doctor developing photonic antiviral treatment consulted his scientific background. “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.”

The advantage it possessed, though, was its ability to transmit through aqueous environments, allowing substantial bodily penetration.

Mitochondrial Effects and Brain Health

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. These organelles generate cellular energy, creating power for cellular operations. “Every cell in your body has mitochondria, including the brain,” says Chazot, who concentrated on cerebral applications. “Research confirms improved brain blood flow with phototherapy, which is always very good.”

Using 1070nm wavelength, cellular power plants create limited oxidative molecules. 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: antioxidant, inflammation reduction, and cellular cleanup – self-digestion mechanisms eliminating harmful elements.

Present Investigation Status and Expert Assessments

The last time Chazot checked the literature on using the 1070 wavelength on human dementia patients, he states, about 400 people were taking part in four studies, including his own initial clinical trials in the US