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Phototherapy is clearly enjoying a surge in popularity. You can now buy illuminated devices targeting issues like skin conditions and wrinkles as well as muscle pain and gum disease, the latest being a dental hygiene device outfitted with small red light diodes, described by its makers as “a breakthrough for domestic dental hygiene.” Globally, the industry reached $1 billion in 2024 and is forecast to expand to $1.8 billion by 2035. 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. As claimed by enthusiasts, it’s like bathing in one of those LED-lit beauty masks, enhancing collagen production, soothing sore muscles, reducing swelling and persistent medical issues as well as supporting brain health.

Research and Reservations

“It feels almost magical,” observes Paul Chazot, who has researched light therapy for two decades. 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. Light exposure controls our sleep-wake cycles, as well, stimulating neurotransmitter and hormone production during daytime, and preparing the body for rest as darkness falls. Sunlight-imitating lamps frequently help individuals with seasonal depression to combat seasonal emotional slumps. Clearly, light energy is essential for optimal functioning.

Various Phototherapy Approaches

While Sad lamps tend to use a mixture of light frequencies from the blue end of the spectrum, the majority of phototherapy tools use red or near-infrared wavelengths. In rigorous scientific studies, like examinations of infrared influence on cerebral tissue, determining the precise frequency is essential. Light constitutes electromagnetic energy, extending from long-wavelength radiation to the highest-energy (gamma waves). Therapeutic light application employs mid-spectrum wavelengths, with ultraviolet representing the higher energy invisible light, followed by visible light encompassing rainbow colors and finally infrared detectable with special equipment.

Dermatologists have utilized UV therapy for extensive periods to treat chronic skin conditions such as eczema, psoriasis and vitiligo. It affects cellular immune responses, “and dampens down inflammation,” says a dermatology expert. “There’s lots of evidence for phototherapy.” UVA penetrates skin more deeply than UVB, while the LEDs in consumer devices (usually producing colored light emissions) “generally affect surface layers.”

Safety Considerations and Medical Oversight

Potential UVB consequences, including sunburn or skin darkening, are well known but in medical devices the light is delivered in a “narrow-band” form – meaning smaller wavelengths – that reduces potential hazards. “It’s supervised by a healthcare professional, thus exposure is controlled,” 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 – different from beauty salons, where it’s a bit unregulated, and wavelength accuracy isn’t verified.”

Commercial Products and Research Limitations

Red and blue LEDs, he says, “don’t have strong medical applications, but they may help with certain conditions.” Red wavelength therapy, proponents claim, improve circulatory function, oxygen utilization and skin cell regeneration, and stimulate collagen production – a primary objective in youth preservation. “The evidence is there,” 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, the risk-benefit ratio. Many uncertainties remain.”

Specific Applications and Professional Perspectives

Early blue-light applications focused on skin microbes, bacteria linked to pimples. Scientific backing remains inadequate for regular prescription – despite the fact that, notes the dermatologist, “it’s commonly used in cosmetic clinics.” Certain patients incorporate it into their regimen, he observes, but if they’re buying a device for home use, “we advise cautious experimentation and safety verification. Without proper medical classification, the regulation is a bit grey.”

Cutting-Edge Studies and Biological Processes

Meanwhile, in a far-flung field of pioneering medical science, Chazot has been experimenting with brain cells, identifying a number of ways in which infrared can boost cellular health. “Virtually all experiments with specific wavelengths showed beneficial and safeguarding effects,” he states. It is partly these many and varied positive effects on cellular health that have driven skepticism about light therapy – that results appear unrealistic. Yet, experimental evidence has transformed his viewpoint.

The researcher primarily focuses on pharmaceutical solutions for brain disorders, 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 explains. “I was quite suspicious. The specific wavelength measured approximately 1070nm, which most thought had no biological effect.”

What it did have going for it, though, was that it travelled through water easily, enabling deeper tissue penetration.

Cellular Energy and Neurological Benefits

More evidence was emerging at the time that infrared light targeted the mitochondria in cells. Mitochondria are the powerhouses of cells, producing fuel for biological processes. “Mitochondria exist throughout the body, even within brain tissue,” notes the researcher, 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 generally advantageous.”

With 1070 treatment, energy organelles generate minimal reactive oxygen compounds. In limited quantities these molecules, notes the scientist, “stimulates so-called chaperone proteins which look after your mitochondria, protect cellular integrity and manage defective proteins.”

All of these mechanisms appear promising for treating a brain disease: 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 says, about 400 people were taking part in four studies, comprising his early research projects